Kandel; Search of Memory
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Kandel; Search of Memory 59 Biology of nerve cells -- three principles: (1) neuron doctrine states that the nerve cell is the fundamental building block and elementary signaling unit of the brain, (2) ionic hypothesis focuses on the transmission of information within the nerve cell, (3) chemical theory of synaptic transmission focuses on the transmission of information between nerve cells.
Kandel; Search of Memory 60 Chemical theory of synaptic transmission focuses on the transmission of information between nerve cells. 1
Kandel; Search of Memory 61 British physiologist Charles Sherrington 1
Kandel; Search of Memory 61 Unlike most of the cells of the body, which have a simple shape, nerve cells have highly irregular shapes and are surrounded by a multitude of exceedingly fine extensions of axons and dendrites. 0
Kandel; Search of Memory 62 Axons and dendrites are extremely thin (about 10-2 the thickness of a human hair). 1
Kandel; Search of Memory 63 Neuron in the hippocampus (drawn by Cajal) 1
Kandel; Search of Memory 70 Charles Sherrington  (1857-1952) photo. 7
Kandel; Search of Memory 91 Electrical versus chemical theory of synaptic transmission "sparkers" versus "soupers". 21
Kandel; Search of Memory 95 Three pioneers of synaptic transmission: Stephen Kuffler (1918 -1980), John Eccles 1903 -1997), Bernard Katz (1911 -2002). photo 4
Kandel; Search of Memory 96 Greatest strength of the scientific method is its ability to disprove a hypothesis. Science proceeds by endless and ever refining cycles of conjecture and refutation. 1
Kandel; Search of Memory 98 Myasthenia gravis, a serious autoimmune disease that occurs primarily in men, produces antibodies that destroy the acetylcholine receptors in muscle cells and thus weakens muscle action. Muscular weakness can become so severe that patients cannot keep their eyes open. 2
Kandel; Search of Memory 99 Major excitatory neurotransmitter in the brain is the amino acid glutamate. Main inhibitory transmitter is the amino acid GABA. 1
Kandel; Search of Memory 99 A variety of tranquilizing drugs -- benzodiazepines, barbiturates, alcohol, and general anesthetics -- bind to GABA receptors and produce a calming effect on behavior by enhancing the receptor's inhibitory function. 0
Kandel; Search of Memory 99 Eccles wrote, "I had been encouraged by Karl Popper to make my hypothesis as precise as possible, so that it would call for experimental attack and falsification, It turned out that it was I who was to succeed in this falsification." 0
Kandel; Search of Memory 101 Bernard Katz discovered that neurotransmitters such as acetylcholine are not released from the axon terminal as single molecules but in small discrete packets containing about 5000 molecules each. 2
Kandel; Search of Memory 102 Bernard Katz discovered that when an action potential enters a presynaptic terminal, it causes calcium channels to open, letting calcium ions flow into the cell. This leads to the release of neurotransmitters into the synaptic cleft. 1
Kandel; Search of Memory 105 Serotonin acts on as many as 18 different types of receptors throughout the brain. LSD seems to produce its hallucinatory actions by stimulating one of these receptors located in the frontal lobe of the brain. 3
Kandel; Search of Memory 107 An anatomically simple system is crucial to the success of a biological experiment. Invertebrate animals are a rich source of simple systems. The choice of an experimental system is one of the most important decisions a biologist makes. 2
Kandel; Search of Memory 108 Kandel graduated from medical school in 1956. 1
Kandel; Search of Memory 112 Sensory homunculus -- Wilder Penfield's sensory map of the body as represented in the brain. 4
Kandel; Search of Memory 113 All sensory information is organized topographically in the brain in the form of precise maps of the body's sensory receptors, such as retina of the eye, basilar membrane in the ear, or skin on the body surface. 1
Kandel; Search of Memory 119 Phrenology --  Franz Joseph Gall (1758-1828) By the late 1820s Gall's ideas and the discipline of phrenology had become extremely popular. 6
Kandel; Search of Memory 121 Broca (1824-1880) and  Wernicke (1848-1905) photos. 2
Kandel; Search of Memory 123   Broca's area and Wernicke's area diagram. 2
Kandel; Search of Memory 125 Wilder Penfield (1891-1976) photo 2
Kandel; Search of Memory 127 H. M.'s epilepsy 2
Kandel; Search of Memory 128 Brenda Milner (b. 1918) photo 1
Kandel; Search of Memory 130 Explicit and implicit memories are processed and stored in different regions in the brain. (diagram) 2
Kandel; Search of Memory 131 H. M.'s procedural learning. 1
Kandel; Search of Memory 133 Brenda Milner's papers on HM -- how much these studies clarified our thinking about memory. 2
Kandel; Search of Memory 147 Brain of Aplysia (diagram) 14
Kandel; Search of Memory 167 Three types of implicit learning: Habituation, Sensitization, Classical conditioning.  (Diagram) 20
Kandel; Search of Memory 189 Habituation and Sensitization 22
Kandel; Search of Memory 191 Aplysia's simplest behavior, the gill withdrawal reflex. 2
Kandel; Search of Memory 192 How is short-term memory converted to long-term memory in the brain? 1
Kandel; Search of Memory 199 Psychologist Donald O. Hebb in his influential 1949 book, The Organization of Behavior: a neuropsychological theory.  Hebb argued that reverberatory circuits are responsible for short-term memory. 7
Kandel; Search of Memory 211 Head injuries and concussion can lead to a memory loss called retrograde amnesia.  Boxer who suffers a concussion.  Epileptic convulsion. 12
Kandel; Search of Memory 211 In its early phases, memory storage is dynamic and sensitive to disruption. 0
Kandel; Search of Memory 214 Anatomical changes accompany long-term memory. (diagram) 3
Kandel; Search of Memory 217 Map of the cortex changes with experience (diagram) 3
Kandel; Search of Memory 224 Two types of circuits in the brain.   (1) mediating circuits produce behaviors, (2) modulatory circuits act on the mediating circuits, regulating the strength of their synaptic connections. 7
Kandel; Search of Memory 224 Once we knew that serotonin acted as a modulatory transmitter to enhance the release of glutamate from the presynaptic terminals of the sensory neuron, the stage was set for a biochemical analysis of memory storage. 0
Kandel; Search of Memory 228 Two classes of receptors: (1) ionotropic receptors produce changes lasting milliseconds. (2) Metabotropic receptors   (e.g., serotonin receptors) act through second messengers. They produce changes that last seconds to minutes and are broadcast throughout the cell. 4
Kandel; Search of Memory 229 Biochemical steps in short-term memory. (diagram) 1
Kandel; Search of Memory 233 Molecules involved in short-term memory. (diagram) 4
Kandel; Search of Memory 241 Long-term memory formation depends upon this synthesis of new proteins. 8
Kandel; Search of Memory 241 By 1980, molecular biology had become the dominant and unifying force in biology.  Extended its influence to neural science and help create a new science of mind. 0
Kandel; Search of Memory 244 Brenner and Crick in 1961 proved that the genetic code consists of a series of nucleotide triplets. 3
Kandel; Search of Memory 244 Marshall Nirenberg and Har Gohind Khorana in 1961 cracked the genetic code by describing the specific combinations of nucleotides that code for each amino acid. 0
Kandel; Search of Memory 245 Half of the genes expressed in the human genome are present in much simpler invertebrate animals such as the worm C. elegans, the  fly Drosophila, and the snail Aplysia. The mouse has  more than 90 percent and the higher apes 98 percent of the coding sequences of the  human genome. 1
Kandel; Search of Memory 248 Dialogue between the neuron's genes and its synapses in the formation of long-term memory. 3
Kandel; Search of Memory 256 Changes underlying short- and long-term memory in a single sensory and motor neuron. (diagram) 8
Kandel; Search of Memory 257 Jacob and Monod inferred what we now know to be a fact: that even in a complex organism like a human being, almost every gene of the genome is present in every cell of the body. Every cell has in its nucleus all of the chromosomes of the organism. In each cell type, only some of those genes are turned on, or expressed, all of the other genes are shut off or repressed. 1
Kandel; Search of Memory 257 Genes are switched on and off as needed to achieve optimal functioning of the cell. Some genes are repressed for most of the lifetime of the organism; Other genes, such as those involved in the production of energy, are always expressed because the proteins they encode are essential for survival. 0
Kandel; Search of Memory 257 Distinguish between effector genes and regulatory genes. Effector genes encode effector proteins such as enzymes and ion channels, which mediate specific cellular functions. Regulatory genes encode regulatory proteins, which switch the effector genes on and off. 0
Kandel; Search of Memory 258 Jacob and Monod not only outlined a theory of gene regulation, they also discovered the first regulators of gene transcription. These regulators come in two forms: repressors, genes that encode the regulatory proteins that shut jeans off, and as later work showed, activators, genes that encode the regulatory proteins that turn genes on. 1
Kandel; Search of Memory 259 In 1983 Eric Kandel shared with Vernon Mountcastle the Lasker Award in basic medical sciences, the most important scientific recognition awarded in the United States. 1
Kandel; Search of Memory 265 Molecular mechanisms for short- and long-term facilitation. (diagram) 6
Kandel; Search of Memory 284 In 1949, psychologist D. O. Hebb had predicted that some kind of neural coincidence detector would be present in the brain during learning.: "When an axon of cell A . . . excites cell B and repeatedly or persistently takes part in its firing, some growth process or metabolic changes take place in one or both cells so that A's efficiency is increased." 19
Kandel; Search of Memory 307 Knowledge of space is central to behavior. 23
Kandel; Search of Memory 308 We do not have a sensory organ dedicated to space; representation of space is a quintessentially cognitive sensibility; it is the binding problem writ large. 1
Kandel; Search of Memory 308 Brain must combine inputs from seven different sensory mode modalities and then generate a complete internal representation that does not depend exclusively on any one input. 0
Kandel; Search of Memory 308 Brain commonly represents information about space in many areas and many different ways. 0
Kandel; Search of Memory 308 Egocentric coordinates (centered on the receiver) 0
Kandel; Search of Memory 308 Where an odor or touch comes from with respect to the body. 0
Kandel; Search of Memory 308 Egocentric representation is also used by people or monkeys for orienting to a sudden noise by making an eye movement to a particular location. 0
Kandel; Search of Memory 308 Memory for space: encode an organisms position relative to the outside world and the relationship of external objects to one another. 0
Kandel; Search of Memory 308 Allocentric coordinates (centered on the world) 0
Kandel; Search of Memory 308 Sensory maps for touch and vision in the brain, which are based on egocentric coordinates. 0
Kandel; Search of Memory 308 Egocentric maps for touch and vision discovered by Wade Marshall, Vernon Mountcastle, David Hubel, and Thorsen Wiesel. 0
Kandel; Search of Memory 308 How sensory information comes into the hippocampus. 0
Kandel; Search of Memory 308 Hippocampus is concerned with perception of the environment and therefore represents multisensory experience. 0
Kandel; Search of Memory 308 Hippocampus of rats contains a multisensory representation of extra personal space. 0
Kandel; Search of Memory 309 Place cells fire action potentials only when an animal moves into a particular location, while others fire when the animal moves to another place. 1
Kandel; Search of Memory 309 Brain breaks down its surroundings into many small overlapping areas, similar to a mosaic, each represented by activity in specific cells in the hippocampus. 0
Kandel; Search of Memory 309 Internal map develops within minutes of the rat's entrance into a new environment. 0
Kandel; Search of Memory 309 Spatial map of even a simple locale does not form instantaneously but over 10 to 15 minutes of the rat's entrance into the new environment. 0
Kandel; Search of Memory 309 Formation of the map is a learning process; practice makes perfect. 0
Kandel; Search of Memory 309 Map remain stable for weeks or even months. 0
Kandel; Search of Memory 309 Vision, touch, or smell are prewired and based on an a priori knowledge. 0
Kandel; Search of Memory 309 Spatial map is based on a combination of a priori knowledge and learning. 0
Kandel; Search of Memory 309 A general capability for forming a spatial map is built into the mind, but the particular map is not. 0
Kandel; Search of Memory 309 Unlike neurons in a sensory system, place cells are not switched on by sensory stimulation 0
Kandel; Search of Memory 309 Collective activity of place cells represents the location where an animal thinks it is. 0
Kandel; Search of Memory 309 O'Keefe had discovered place cells in 1971. 0
Kandel; Search of Memory 309 Bliss and Lomo had discovered long term potentiation in the hippocampus in 1973. 0
Kandel; Search of Memory 310 Some of the same molecular actions responsible for long term potentiation are necessary for preserving a spatial map over a long period. 1
Kandel; Search of Memory 310 Protein kinase A and protein synthesis are required for the stabilization of the spatial map. 0
Kandel; Search of Memory 311 Explicit memory requires selective attention for encoding and for recall. 1
Kandel; Search of Memory 311 Selective attention is widely recognized as a powerful factor in perception, action, and memory -- and the unity of conscious experience. 0
Kandel; Search of Memory 311 Animals are inundated with a vast number of sensory stimuli, yet they pay attention to only one or a very small number of them, ignoring or suppressing the rest. 0
Kandel; Search of Memory 311 Because of selective attention, internal representations do not replicate every detail of the external world, and sensory stimuli alone do not predict every motor action. 0
Kandel; Search of Memory 311 In our moment-to-moment experience, we focus on specific sensory information and exclude the rest. 0
Kandel; Search of Memory 311 Focusing of the sensory apparatus is an essential feature of all perception. 0
Kandel; Search of Memory 311 Vocalization, concentration of consciousness.  It implies withdrawal from some things in order to deal effectively with others. 0
Kandel; Search of Memory 312 Attention also allows us to bind the various components of the spatial image into a unified whole. 1
Kandel; Search of Memory 312 Four conditions that require increasing degrees of attention:  (1) basal or ambient attention is present even in the absence of further stimulation, (2) animals forage for food, (3) animals discriminate between two environments, (4) animals learn a spatial task. 0
Kandel; Search of Memory 312 As a mouse walks around in its enclosure, lights and sounds, which the mouse hates, periodically come on; the only way the mouse could turn them off is to find a small unmarked goal region and sit there for a moment.  Mice learn this task very well. 0
Kandel; Search of Memory 312 Even ambient attention is sufficient to allow a spatial map to form and become stable for a few hours, but such a map becomes unstable after three to six hours. 0
Kandel; Search of Memory 312 In the visual system, attention enhances the response of neurons to stimuli. 0
Kandel; Search of Memory 312 Modulatory pathway that had been strongly implicated in attention-related phenomena was the one mediated by dopamine. 0
Kandel; Search of Memory 312 Cells that make dopamine are clustered in the mid-brain and their axons project to the hippocampus. 0
Kandel; Search of Memory 313 Axons of dopamine producing neurons in the midbrain sends signals to a number of sites, including the hippocampus and prefrontal cortex. 1
Kandel; Search of Memory 313 Prefrontal cortex, which is recruited for voluntary action, signals back to the midbrain, adjusting the firing of the dopamine-producing neurons. 0
Kandel; Search of Memory 313 The fact that some of the same regions of the brain that are recruited for voluntary behaviors are also recruited for attentional processes reinforces the idea that it's selective attention is critical to the unitary nature of consciousness. 0
Kandel; Search of Memory 313 Involuntary attention is activated by a property of the external world -- of the stimulus -- and it is captured and according to William James, by "big things, bright things, moving things, or blood." 0
Kandel; Search of Memory 313 Voluntary attention is a specific feature of explicit memory and arises from the internal need to process stimuli that are not automatically salient. 0
Kandel; Search of Memory 313 Voluntary attention is a conscious process and is likely to be initiated in the cerebral cortex. 0
Kandel; Search of Memory 313 Both voluntary and involuntary attention recruit biological signals of salience, such as neuromodulatory neurotransmitters, that regulate the function or configuration of a neural network. 0
Kandel; Search of Memory 314 Whether memory is implicit or explicit is the manner in which the attentional signal for salience is recruited. 1
Kandel; Search of Memory 314 Conversion of short-term to long-term memory requires the activation of genes and in each case modulatory transmitters appear to carry an attentional signal marking the importance of a stimulus. 0
Kandel; Search of Memory 314 In implicit memory storage, the attentional signal is recruited involuntarily (reflexively), from the bottom up. 0
Kandel; Search of Memory 314 In spatial memory, dopamine appears to be recruited voluntarily from the top down. 0
Kandel; Search of Memory 314 Cerebral cortex activates the cells that release dopamine, and dopamine modulates activity in the hippocampus. 0
Kandel; Search of Memory 314 Similar molecular mechanisms are used for top-down and bottom-up attentional processes. 0
Kandel; Search of Memory 316 Brain imaging shows activation of different areas in men and women as they think about space: the left hippocampus in men and the right parietal and right prefrontal cortex in women. 2
Kandel; Search of Memory 324 Monod-Jacob theory of gene regulation. 8
Kandel; Search of Memory 324 Walter Gilbert isolated the first gene regulator, showing that it was a protein that bound to DNA; also developed a method for sequencing DNA, which won him the Nobel Prize in chemistry in 1980. 0
Kandel; Search of Memory 325 Receptors for the neurotransmitter serotonin.  Almost all of the antidepressants act through serotonin. 1
Kandel; Search of Memory 336 In the 1960s, psychiatric illnesses were classified into two major groups: organic illnesses and functional illnesses, a classification that dated to the 19th century. 4
Kandel; Search of Memory 337 Neurological diseases and psychiatric diseases differer in several important ways. 1
Kandel; Search of Memory 337 Neurology has long been based on the knowledge of where in the brain specific diseases are located.  Of central concern to neurology -- strokes, brain tumors, degenerative diseases that produce clearly discernible structural damage. 0
Kandel; Search of Memory 337 Huntington's disease is a disorder of the caudate nucleus. 0
Kandel; Search of Memory 337 Parkinson's disease is a disorder of the substantia nigra. 0
Kandel; Search of Memory 337 Amyotropic lateral sclerosis (ALS) is a disorder of motor neurons. 0
Kandel; Search of Memory 337 A number of common neurological illnesses are caused by a single defective gene.  Once a mutation is identified, it becomes possible to express the mutant gene in mice and flies and thus to discover how the gene gives rise to disease. 0
Kandel; Search of Memory 337 Physicians no longer diagnose neurological disorders solely on the basis of behavioral symptoms. 0
Kandel; Search of Memory 337 Mental illness is a much more difficult task than locating structural damage in the brain. 0
Kandel; Search of Memory 337 Psychiatric illnesses are disturbances of higher mental functions. 0
Kandel; Search of Memory 337 Anxiety states and the various forms of depression are disorders of emotion. 0
Kandel; Search of Memory 337 Schizophrenia is a disorder of thought. 0
Kandel; Search of Memory 338 Emotion and thinking are complex mental processes mediated by complex neural circuitry. 1
Kandel; Search of Memory 338 Although most mental illnesses have an important genetic component, they do not have straightforward inheritance patterns, because they are not caused by mutations of a single gene. 0
Kandel; Search of Memory 338 No single gene for schizophrenia, no single gene for anxiety disorders, depression, or most other mental illnesses. 0
Kandel; Search of Memory 338 Genetic components of mental illnesses arise from the interaction of several genes with the environment. Each gene exerts a relatively small effect, but together they create a genetic predisposition -- a potential for a disorder. 0
Kandel; Search of Memory 338 Most psychiatric disorders are caused by a combination of genetic predispositions and some additional environmental factors. 0
Kandel; Search of Memory 338 Identical twins have identical genes.  If one twin has Huntington's disease, so will the other.  But if one twin has schizophrenia, the other has only a 50% chance of developing the disease. 0
Kandel; Search of Memory 345 Neural pathways of learned fear. (mouse diagram) 7
Kandel; Search of Memory 347 Modifying fear pathways through learning. (diagram) 2
Kandel; Search of Memory 352 Schizophrenia is characterized by three types of symptoms. 5
Kandel; Search of Memory 377 In 1976, at age 60, Francis Crick turned to the biological nature of consciousness. 25
Kandel; Search of Memory 378 René Descartes' 17th-century ideas were still current in the 1980s, Karl Popper, the Viennese born philosopher of science, and John Eccles, the Nobel laureate neurobiologist, espoused dualism all of their lives. 1
Kandel; Search of Memory 384 Crick's focus on the claustrum. 6
Kandel; Search of Memory 386 Ekman's seven universal facial expressions (photos) 2
Kandel; Search of Memory 407 "Heil Hitler!" Vienna  (photo) 21
Kandel; Search of Memory