Suzanne
Corkin; Permanent Present Tense
- Amnesic Patient (H. M.) Henry Molaison |
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Henry was born on February 26, 1926, in Manchester, Connecticut. |
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On Tuesday, August
25, 1953, neurosurgeon
William Beecher Scoville operated on patient Henry Gustave
Molaison at Hartford
Hospital in Hartford,
Connecticut in an effort to control his epileptic seizures, which were
occurring daily in spite of massive medication. |
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Scoville was trained in, and a strong
proponent of, psychosurgery. |
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Scoville believed that surgery offered a radical but potentially transformative
solution for desperate
cases. |
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Psychosurgery was considered a valid, if experimental, treatment for numerous psychiatric diseases, including schizophrenia,
depression, anxiety neuroses, and obsessional states. |
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When most people think about psychosurgery, they think of frontal lobotomy, disconnecting the frontal lobes from the rest of the brain. |
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Henry's
seisures were becoming more
frequent, putting Henry's
life at risk, and he was no longer responding
satisfactorily to even massive doses of
medication. To Scoville, no doubt, surgery seen the last best option. |
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In the 1930s, psychosurgery began on a grand scale. |
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By the late
1950s it became clear that lobotomies were hazardous. |
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In the later 20th century, newly
synthesized antipsychotic medications began to replace psychosurgery as a
form of treatment. |
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At the time of Henry's
operation, psychosurgery was still in vogue. |
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Because of the severity of Henry's epilepsy and inability to control it, even with
high levels of medication, Scoville thought he would be a good candidate for what he
later called a "frankly experimental operation." |
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Montréal
Neurological Institute opened its doors in 1934. "The Neuro" epitomized
the wisdom of advancing science, teaching, and patient care under a single
umbrella. Around the Institute, Wilder Penfield became known as "The
Chief"; he was a skilled
and innovative neurosurgeon as well as a strong leader. |
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Penfield develop the approach of operating
on epilepsy patients
while they were awake and conscious so that he could pinpoint the abnormal tissue
responsible for their seizures – the technique became known as the Montréal Procedure. |
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Brenda
Milner, who became a crucial player in the
development of memory science, was a graduate student in psychology at McGill University when she began her collaboration
with Penfield. |
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Born in Manchester,
England, in 1918, Brenda Milner studied experimental psychology during her undergraduate years at the University of Cambridge. |
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Milner moved to Montréal in 1944
and two years later had the distinction of being a student in the first seminar at McGill University taught by Donnell O. Hebb, a physiological psychologist who was
highly influential in the science of learning and
memory. |
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In 1947 Brenda Milner became Donnell
O. Hebb's graduate student. |
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Penfield operated on a great many epileptic patients to control their seizures. |
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Penfield's cases show that the anatomical foundation of amnesia is a loss of function in both hippocampi. |
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If a person has damage to only one hippocampus, either the
left of the right, the result is not catastrophic. |
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Subsequent research on hundreds
of patients has taught us that the hippocampus can be removed safely on one side with only minor memory impairment, as long
as the other hippocampus is intact. |
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One hippocampus by itself
apparently can compensate largely for its missing twin, suggesting that the
two structures share a general capability for making memories. |
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The left
temporal lobe is specialized to process verbal information, and the right temporal lobe
visual-spatial information. |
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Anatomical bridges that cross
the brain from left to right and right to left give each temporal lobe access
to the specialized information from the other side. |
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When one hippocampus is missing,
the remaining one can engage multiple kinds of knowledge, both verbal and
nonverbal, to support satisfactory learning and memory. |
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The results of Milner's psychological evaluation
of Scoville's patients
formed the basis of Scoville and Milner's "Loss of Recent Memory after
Bilateral Hippocampal Lesions," the
benchmark Journal of Neurology, Neurosurgery, and
Psychiatry paper. |
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This paper has become a
classic in neuroscience literature
because it informs neurosurgeons that destroying the medial temporal lobe
structures on both sides of the brain would cause amnesia and should be
avoided. The results also establish for the first time that a distinct region
of the brain, the hippocampus and its neighbors, was necessary for long-term
memory formation. |
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The Scoville
and Milner article formed the basis of decades of experimental studies of
amnesic patients, and
inspired animal models
of amnesia that yielded a wealth of information on the biology of memory processes. |
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Milner examined Henry for the first time in April 1955, 20 months after his
operation. |
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Henry's
overall intelligence
was above average,
and his capacities for perceptual, abstract
thinking, and
reasoning were normal. |
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Scoville and Milner concluded
their celebrated paper by identifying the hippocampus and adjacent
hippocampal gyros as a substrate for remembering new information. |
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As Miller delved deeper into the
study of memory loss, and Henry's in particular, Scoville
moved on. He maintained an active neurosurgical practice and
published more than 50 papers in medical journals, but did not continue to see
Henry. |
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Scoville warned other
neurosurgeons against damaging the hippocampal area on both sides of the
brain. In a 1974 lecture, he called Henry's operation "a tragic
mistakes." |
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In 1961, Suzanne Corkin joined Milner's laboratory at the Neuro as a McGill University graduate student. This institution was renowned for the treatment of epilepsy patients, using the surgical procedures Penfield had developed. |
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Milner was especially skilled at designing
tests that could be given before and after an operation to
tease apart a patient's performance on different cognitive tests – sensory perception, reasoning,
memory, and problem
solving – to discover any changes in brain function caused
by the surgery. |
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Corkin and Milner communicated closely with surgeons
and knew after each procedure what part of the patient's brain had been
removed and the size of the excision. |
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Corkin had the opportunity to witness
operations on patients'
brains from behind a glass
window in the viewing
gallery in the main
operating amphitheater. She could look over the surgeon's shoulder
at the patient's brain
and watch the surgeon stimulate
the brain and map out
landmarks before removing
any issue. To guard against damaging areas specialized for language and movement, the surgeon identified
the region by electrically stimulating the outer
layers of the brain while the patients were awake. |
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Corkin's
PhD thesis projects
studied how operations to alleviate epilepsy affected the somatosensory system – the sense of touch. |
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Corkin first met Henry
in May 1962, when Milner arranged for him to visit the Neuro for testing. |
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At the time of his visit to
Montréal, Henry was in his 30s, in it prime of his life, but completely
dependent on his mother, Ms. Molaison. |
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Short-term memory, as defined by
memory researchers, does not refer to recalling what we did yesterday, this
morning, or even 20 min. ago. That kind of
recollection is recent, long-term memory. |
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Short-term
memory is the immediate
present, the information on our "radar
screens" at this very moment; it expires within about 30 seconds or less, depending on
the task. |
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Short-term
memory capacity is limited, and it fades immediately if we do not
rehearse it or convert it into a form that can be retained in long-term
memory. |
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The short-term
memory store is not a warehouse in the brain;
instead it is a series of processes that keep bits of information, such as a phone number, active
for a brief period of time. |
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Long-term
memory is anything we
remember after a few seconds have elapsed. |
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Henry's
role as a research
participant began in 1953, just prior to his operation. Scoville order a complete
psychological evaluation to establish a preoperative baseline against which
to measure any changes resulting from the procedure. |
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In 1974,
psychologist Alan Baddeley posited that working memory is not a unitary
system but consists of three subsystems: a central executive that calls the shots, and to slave systems that do the hard
work – one devoted to visual information and one to language. |
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Baddeley's
working memory model has generated an explosion
of experiments, trying to identify the mechanisms operating within the each
system. |
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In August
1977 a CT scan of Henry's brain confirmed only
that he was missing tissue in each temporal lobe, but researchers were unable to
judge exactly which structures had been removed and to what extent. |
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By the mid-1970s, mounting evidence from animal and human tests had convinced
scientists that the hippocampus was vital for converting short-term memory into long-term memory. |
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In the early 1990s, researchers
were finally able to thoroughly assess the damage that has been done to
Henry's brain, thanks to the development of magnetic resonance imaging (MRI),
which had been invented in 1970. |
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The MIT
clinical research Center (CRC), the base of all
this testing, was established in 1964 as part of a larger movement to create federally funded centers for
academic research on human diseases. The clinical research centers, funded by the National Institutes of Health,
were instrumental in applying scientific techniques to studying disorders in a clinical setting. |
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In 1953, when Henry returned home from the hospital after his radical
operation, it became clear to the parents that even
mundane activities would be a challenge for him. |
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Henry's boss at Royal Typewriter in Hartford phoned Ms. Molaison and
told her that Henry was too forgetful to do his job. |
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Henry
stayed home with his parents, under his mother's constant care. Singlehandedly, she looked after all of his needs for the
next three decades. |
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Henry
helped his parents with household chores but forgot the
location of items to use frequently. |
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Henry would read
the same magazines repeatedly, and would complete
jigsaw puzzles
without realizing he had already done them. |
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Henry's spatial
memory – declarative
memory for spatial
locations – was deficient. |
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By the 1990s, scientists have uncovered a network
of brain regions, including the hippocampus and areas in the cortex, which are
engaged when remembering the topography of spaces |
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Some
components of Henry's brain
network for processing information
about space were still
present. They including specific areas in
parietal, temporal, and occipital lobes – the somatosensory cortex, parietal,
temporal, occipital lobes – somatosensory cortex, parietoinsular
vestibular cortex, part of the posterior
parietal cortex, inferotemporal cortex, and posterior cingulate/retrosplenial
cortex. |
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Henry's successful acquisition
of the cognitive map of the house provided astonishing evidence of spatial knowledge, acquired slowly over time. |
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Through countless
hours of practice,
Henry slowly learned
the geography of his house, without awareness and without consciously referring to a declarative
memory. |
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On rare occasions, Henry somehow, compensated for the devastating
effects of his hippocampal damage by mobilizing preserved brain regions and networks. |
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A basic requirement for memory formation is intact perception. |
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Researchers consistently
documented Henry's disorder
with a wide range of test stimuli – words, stories, faces,
pictures, scenes, mazes, puzzles, and more. |
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For at least four years, Henry
was unable to articulate the fact that his father had died. |
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Corkin did not question Henry
explicitly about the father because she knew it would upset him. |
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Without a functioning hippocampus and amygdala, Henry did not form long-term emotional memories. |
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Henry's intelligence was above average; his IQ was 120 in 1962. |
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Henry continued to have occasional tantrums, sometimes
showing frustration
at his inability to remember. |
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All of Henry's medical attention
at MIT was free and place no financial burden on the Molaison family. |
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Henry was smoking a pack of cigarettes a day. |
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Henry good feel and communicate
emotions – both positive and negative – despite missing
almost all of his amygdala, one of the key structures
underlying emotion. |
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Henry could judge the emotions
in pictures of faces, indicating whether an expression was happy or sad. |
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Henry was usually on an even keel, but on rare
occasions he would become very angry. |
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Henry was mild-mannered,
friendly, and patient, and his behaviors in social situations was exemplary. At the
CRC, he was always docile and friendly. |
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In 1969, psychologist Paul Ekman
proposed that people across all cultures experience six
basic emotions: sadness, happiness,
anger, fear, disgust, and surprise. |
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The cognitive
operations of long-term
memory are grounded in information
theory, an idea introduced in 1948 by Claude
Shannon, an engineer at New Jersey's Bell Telephone Laboratories. |
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Shannon introduced this idea in
his mathematical theory of communication, integrating knowledge from applied
mathematics, electrical engineering, and cryptography to describe the transmission of information as a statistical process, and coining the term bit to describe the most fundamental
unit of information. |
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Conceptualizing learning and
memory in terms of information processing was a key advance, allowing
researchers to divine memory into three stages of development. |
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The first
stage is encoding information by turning sensory inputs from the world into
representations in the brain. |
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The second
stage is storing those representations so that so
they can be extracted later. |
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The third
stage is retrieving the stored memories when they are needed. |
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Henry had no trouble encoding information. |
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The stimuli that Henry's brain
received could be held briefly, but they could not be stored away and revise
revisited later. |
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Beginning with the publication
of Scoville and Melrose paper in 1957, Henry's case helped launch decades of
research that directed dissected the cognitive and neural processes within
each of the three stages of memory formation. |
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Miller's
landmark discovery with Henry's long-term memory processes led to the important theoretical distinction between declarative or explicit memory and nondeclarative or implicit memory. |
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Declarative
memory, rooting in the medial
temporal lobes, refers to the type of memory we involve in everyday conversation. |
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Declarative memory includes the
capacity you recollect consciously to kind of information: episodic knowledge
– the recollection of specific experiences – and semantic knowledge – general
knowledge, such as information we gather about people,, places, language,
maps, and concepts, not only to a particular learning event. |
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In many ways, declarative memory is the backbone of everyday life,
enabling us to acquire the knowledge we need to pursue goals and dreams and
to function as independent people. |
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Henry lived for 55 years without acquiring any new
declarative memories. |
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The structures
removed from Henry's
brain were dedicated to declarative memory. |
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Henry surgery left intact of the
circuits that supported his nondeclarative memory, resulting in his ability
to learn new motor skills and acquire conditioned responses. |
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Research that stem from Henry's case shed light on the
fundamental processes that underlie the encoding,
storage, and
retrieval of episodic
knowledge. |
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Over the latter
part of the 20th
century great progress has been made in
characterizing the three stages of memory processing. |
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In the 1990s, the development of brain imaging
tools such as Positron
Emission Tomography (PET) and functional MRI. |
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After the discovery that
conscious remembering depends on mechanisms in the hippocampus and its close neighbor, the parahippocampal
gyrus, scientists began to tackle basic questions
in the psychology and biology of episodic
learning. |
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The likelihood
that we will remember
a name, face, date, address, directions to a party, or anything else is
related to the richness
of the representation. |
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Researchers link the use of highly emotional images to an
increased volume in the cingulate gyrus, a part of the limbic system. |
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Encoding is the gateway to memory formation, with consolidation and storage following closely behind. |
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Henry could encode information presented to him and register it
briefly, but then his processing broke down, and
he could not consolidate and store the information. |
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In 1995, when functional MRI was in its infancy, MRI images showed increased
activity in Henry's frontal lobes as he performed a picture
encoding task. |
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In processing pictures of either indoors or
outdoors scenes, two separate areas in the left
frontal lobe and an area in the right frontal lobe, are normally
active during the encoding. |
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The consolidation process by which memories become fixed is a lasting
change that happens in individual neurons and their molecular components. Connections between adjacent neurons become stronger or weaker in response to the learning
experiences. |
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Having no hippocampi, Henry was unable to initiate and
complete the active processes required for consolidation. |
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Early in the 20th century,
researchers discovered that declarative learning, consciously retrieving facts and episodes, does not immediately lead to the enduring memory. Instead, consolidation depends on changes in the brain that occur gradually over time. During this time, the newly learned material is susceptible
to interference. |
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Experiments have shown that consolidation is an active process that takes time. The associations are easily broken right after encoding, but become stronger from minute to minute. |
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In Henry's
brain, the critical cellular events in the hippocampus and cortex that occur for minutes or hours after encoding never activated, and thus new declarative information could
not be secured. |
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Neuroscientists have learned
that the neural infrastructure
of memories can be
disrupted by injury
to brain physiology
in the form of drugs, alcohol, or head injury. |
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Vulnerability to memory formation is prevalent in football. |
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The crucial lesson Henry's injury taught us is that
the hippocampus is
necessary for building associations. |
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Association, a basic concept in both animal and human learning, is the essence of episodic memory; it enables us to
characterize a unique event by integrating its context and time and space. |
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Associations develop and strengthen over time when particular items occur
together repeatedly. |
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We experience association when
we moved to a new neighborhood and gradually get to know the people who live
in our community and to work in the coffee shops, armistice, and restaurants
that we frequent. |
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Eventually, by association we
get to know people well, as we gather information about their personal lives. |
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Over time, by association our
brain build up an elaborate representation of our neighborhood, and with lots
of individual facts and events become connected to one another. |
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After we have lived in a
neighborhood for a few years, we have built up by association a vivid,
detailed picture of what the neighborhood is like. |
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In recent decades, thanks to
contributions from thousands of lands in many countries, scientists have come
to understand the cognitive processes and neural representations that support
the associations we form and our thoughts. |
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Cortical
neighbors of the hippocampus, the parahippocampal areas, flood the hippocampus with complex perceptions, ideas, and context, and the hippocampus associates this wealth of information. |
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The hippocampus links distinct objects with one another and with the time
and place we encounter them – all the objects and the people we saw,
sounds we heard, and aromas we smelled.. |
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The hippocampus links events in time to record the flow of experiences that comprise a unique episode, i.e. the sequence
of entering the coffee shop, getting in line, reading the menu, ordering a
large cappuccino, waiting for the server to provide great, picking up our
order, and rushing out the door to get to work. |
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The hippocampus also links many events and episodes in terms of their common features to form a network of
relationships – i.e. connecting this morning's
coffee shop memory to memories of meals and other coffee shops and
restaurants that we frequent, thus composing our general knowledge of eating
out. |
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Each morning, when we and encode the details of and experience in the coffee shop,
this new learning reactivates many separate events from the past, resulting in an updated, rich associative representation that transcends the individual events. |
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To establish this inclusive
representation of eating out, we depend on cooperative interactions in our
brain between our hippocampus and the regions in the midbrain, a
two-centimeter-long structure that connects the cortex and striatum to areas
lower in the brain. |
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|
Cross episode integration,
connecting separate experiences that have common characteristics, guys
decision-making in everyday life. |
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129 |
|
The intricate cognitive and
neural infrastructure to make associations was not available to Henry. |
|
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129 |
|
When Milner tested Henry for the first time in 1955, she
examined his ability to form word associations by reading aloud word pairs. |
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Short-term associations melted
away for Henry because his brain lacked the medial temporal lobe
infrastructure required to consolidate and store them. |
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|
In this seminal 1957 paper
detailing Henry's operation and his psychological test results, Scoville and
Milner launched the modern era of memory research. |
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|
Research with Henry corroborated
that the hippocampus was crucial for establishment of long-term memory. |
|
0 |
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|
As a result of numerous and
diverse memory tests with Henry, the hippocampus became the focus of
thousands of memory researchers all over the world. |
|
0 |
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|
Memory consolidation depends on
dialogue among brain circuits, Coppola said to the changes within networks of
cells, specifically those in the hippocampus. |
|
0 |
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|
Memory consolidation requires
intense conversations between the hippocampus and areas in the temporal,
parietal, and occipital cortices where bits and pieces of memory are stored. |
|
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157 |
|
Motor skill learning is readily
amenable to a laboratory study, so Henry became a rich resource. |
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157 |
|
Milner's 1955 mirror-drawing
study and Corkin's own 1964 study inspired her to examine whether Henry could
learn other motor skills tasks. |
|
0 |
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|
In 1966, when Henry was 40 years
old, his parents gave their approval for him to check into the Clinical
Research Center (CRC) for two weeks of testing – the first of Henry's 50
visits to the CRC over the next 35 years. |
|
0 |
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158 |
|
Henry intended to do everything
slowly, likely due to phenobarbital prescribed for insomnia as well as
epilepsy. |
|
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158 |
|
Henry could learn new motor
skills and retain that knowledge over long periods of time. |
|
0 |
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160 |
|
Declarative knowledge requires
medial temporal lobe structures for its expression, whereas nondeclarative,
procedural knowledge is independent of that network. |
|
2 |
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160 |
|
Learning new skills, new
procedures, occurs without conscious awareness. |
|
0 |
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160 |
|
Musicians find that their
performance falls apart if they tried to think about a difficult piece of
music note by note; instead, they execute a complex motor sequence without
thinking about it. |
|
0 |
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160 |
|
A concert pianist is driven by
his brain's extensive procedural knowledge acquired over the years that
rigorously practicing that piece; he is integrating the individual keypresses
into a fluent whole, and performs without conscious reference to individual
finger movements. |
|
0 |
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160 |
|
Henry's ability to learn new
motor skills demonstrated convincingly that the areas that had been excised
in his operation – the hippocampus and surrounding structures – were not
necessary for learning new motor skills. |
|
0 |
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161 |
|
Since the beginning of the 20th
century, scientists have known that the striatum and the cerebellum play
important roles in motor control. |
|
1 |
Corkin; Permanent Present Tense |
161 |
|
The striatum include the caudate
nucleus and the putamen. |
|
0 |
Corkin; Permanent Present Tense |
161 |
|
The striatum receives messages
from specific cortical areas and send signals back to the same areas by way
of the thalamus, which integrates sensory and motor activities. |
|
0 |
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161 |
|
The striatum is well-informed
about what is going on in the body and in the world, and is well qualified to
learn difficult motor skills. |
|
0 |
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161 |
|
The cerebellum is a large,
complex structure at the back of the brain under the visual cortex. |
|
0 |
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161 |
|
Henry cerebellum was greatly
reduced in size. |
|
0 |
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161 |
|
The cerebellum is directly
connected to the striatum and to several areas and the cortex by means of
closed circuits. |
|
0 |
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161 |
|
Because the cerebellum receives
information from many parts of the brain and spinal cord, it stands at the
front line of motor control. |
|
0 |
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161 |
|
Abnormalities in the striatum
are responsible for more than 20 disorders, including two progressive brain
diseases, Parkinson's disease and Huntington disease. |
|
0 |
Corkin; Permanent Present Tense |
161 |
|
Within the striatum, the putamen is most affected by Parkinson's
disease and the caudate
nucleus in Huntington
disease. |
|
0 |
Corkin; Permanent Present Tense |
161 |
|
Parkinson's
disease is a common affliction with an unknown
cause that typically strikes people in their 50s, men more than women. |
|
0 |
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161 |
|
Someone afflicted with Parkinson's disease often has an
expressionless face, slow movement, shaking of the hands, stooped posture,
and shuffling steps. |
|
0 |
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161 |
|
Parkinson's disease begins with
a loss of neurons in the substantia nigra, a bundle of gray matter under the
cerebral cortex that normally send out fibers, which carry the
neurotransmitter dopamine up to the striatum. |
|
0 |
Corkin; Permanent Present Tense |
161 |
|
When cells in the substantia
nigra die, as they do in Parkinson's disease, the supply of dopamine
transmitted to the putamen is diminished, causing motor abnormalities. |
|
0 |
Corkin; Permanent Present Tense |
230 |
|
We need a functioning
hippocampus to reexperience unique moments in our past. |
|
69 |
Corkin; Permanent Present Tense |
230 |
|
The network
of brain areas that supports the retrieval of remote autobiographical information is distinct from the network that sustains the
recovery of remote semantic information. |
|
0 |
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230 |
|
Remote autobiographical
information is impaired
in amnesia, while
remote semantic information is not. |
|
0 |
Corkin; Permanent Present Tense |
230 |
|
Medial
temporal lobe structures are engaged in the initial encoding, storage, and retrieval of both kinds of memories – autobiographical information and semantic information. |
|
0 |
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230 |
|
During the process of
consolidation, semantic memory become permanently established in the cortex,
while episodic, autobiographical memory traces continue to depend on medial
temporal lobe structures and definitely. |
|
0 |
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230 |
|
In the late 1970s we did not
know how important sleep is for memory consolidation, and we did not
understand its central role in neural plasticity. |
|
0 |
Corkin; Permanent Present Tense |
230 |
|
In the late 1970s, we knew
little about the neural basis of dreams, and studies of the cognitive
neuroscience of training did not exist. |
|
0 |
Corkin; Permanent Present Tense |
230 |
|
What scientists knew in late
1970s was that there is a relation between movements in different stages of
sleep, and between different stages of sleep and dreaming. |
|
0 |
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231 |
|
Dreams are the product of our
imagination, akin to mental imagery when we are awake. |
|
1 |
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231 |
|
Dream.typically disjointed,
weird, and pleading – not narratives that makes sense. |
|
0 |
Corkin; Permanent Present Tense |
233 |
|
The amygdala is very active during REM sleep. |
|
2 |
Corkin; Permanent Present Tense |
233 |
|
Henry sometimes had nocturnal seizures whose aftermath let him out of
sorts the next day. |
|
0 |
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233 |
|
The nature and quality of Henry's dream content remain a puzzle. |
|
0 |
Corkin; Permanent Present Tense |
234 |
|
If Henry could not remember
anything since his late 20s, how did the injustice seeing himself as a
middle-aged and eventually an older gentleman? |
|
1 |
Corkin; Permanent Present Tense |
234 |
|
When Henry looked in the mirror, he never
expressed shock or lack of recognition; he was comfortable with the person he saw looking back at
him. |
|
0 |
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234 |
|
Scientists know that the brain
contained a region in the fusiform gyrus – a section of the temporal lobe that was preserved in Henry – specialized for processing
fases. |
|
0 |
Corkin; Permanent Present Tense |
234 |
|
Scientists also know that areas
in the prefrontal cortex
become active when
people view their own face. |
|
0 |
Corkin; Permanent Present Tense |
234 |
|
Henry somehow reconcile memories
of himself prior to the operation with his car appearance. |
|
0 |
Corkin; Permanent Present Tense |
235 |
|
During the decades following
Henry's operation, the universe change in countless ways, but he was never
shot by these transformations. |
|
1 |
Corkin; Permanent Present Tense |
235 |
|
Henry unconsciously became
familiar with new information in his environment as a result of repeated
exposures day by day, which gave rise to slow learning over time. |
|
0 |
Corkin; Permanent Present Tense |
235 |
|
During each encounter with his
own face, weighted people who took care of him, and with his environment,
Henry's brain automatically registered that features an integrated them into
stored internal representations of objects and people. |
|
0 |
Corkin; Permanent Present Tense |
235 |
|
Being unable
to establish new memories, Henry could not construct an autobiography as his life unfolded. |
|
0 |
Corkin; Permanent Present Tense |
235 |
|
For many of us, our personal history is the most critical part of who we
are, and we spent considerable time thinking about our past
experiences and imagining how our stories will
play out in the future. |
|
0 |
Corkin; Permanent Present Tense |
235 |
|
Our sense
of self that includes the story of our past and where we
think we are going – our "to-do list." |
|
0 |
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235 |
|
Henry's
operation, in addition to depriving him of the declarative memory, prevented him from mentally traveling forward in time,
in the short term or in the long-term. |
|
0 |
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235 |
|
Henry lacked the pieces to
construct agendas and could not imagine future experiences. |
|
0 |
Corkin; Permanent Present Tense |
235 |
|
Cognitive neuroscientists have
called attention to the link between simulating future
events and episodic
retrieval. |
|
0 |
Corkin; Permanent Present Tense |
235 |
|
Cognitive neuroscientists have
identified a common brain circuit that is engaged in remembering the past and
picturing the future. |
|
0 |
Corkin; Permanent Present Tense |
235 |
|
The process of imagining future events depends on
the medial temporal lobe strutures, the prefrontal cortex, and the posterior parietal
cortex – the same areas critical for declarative memory. |
|
0 |
Corkin; Permanent Present Tense |
236 |
|
When we fantasize about our next
vacation, we tap into long-term memory for details of past vacations and
other knowledge. |
|
1 |
Corkin; Permanent Present Tense |
236 |
|
Remembering past events and
recombining them to create future scenarios require the retrieval of
information from long-term memory. |
|
0 |
Corkin; Permanent Present Tense |
236 |
|
Constructing
the future, like resurrecting
the past, requires establishing functional connections between the
hippocampus and areas
in the frontal, cingulate, and parietal cortices. |
|
0 |
Corkin; Permanent Present Tense |
236 |
|
Henry had no mental database to
consult when asked what he would do the next day, week, or in the years to
come. |
|
0 |
Corkin; Permanent Present Tense |
236 |
|
Henry could not imagine the future any more than he could remember
the past. |
|
0 |
Corkin; Permanent Present Tense |
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Corkin; Permanent Present Tense |
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Corkin; Permanent Present Tense |
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Corkin; Permanent Present Tense |
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Corkin; Permanent Present Tense |
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Corkin; Permanent Present Tense |
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