Dehaene;
Reading in the Brain |
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Dehaene;
Reading in the Brain |
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Some reading areas (diagram) |
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Dehaene;
Reading in the Brain |
1 |
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The reader's
brain contains a complicated
set of mechanisms admirably attuned to reading. |
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Dehaene;
Reading in the Brain |
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Advances in psychology and neuroscience over the last 20 years have begun to unravel the principles underlying the brains reading circuits. |
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Dehaene;
Reading in the Brain |
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Brain imaging methods now reveal, in just a matter of
minutes, the brain
areas that activate when we decipher written words. |
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Dehaene; Reading in the Brain |
1 |
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Scientists can now track a printed word as it progresses from the retina through a chain of processing
stages, each of which is marked by an elementary
question: Are these letters? What do they look like? Are they a word? What does it sound like? How is it pronounced? What does it mean? |
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Dehaene;
Reading in the Brain |
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A continually developing theory of reading postulates that the brain circuitry inherited from our primate
evolution can be co-opted to the task of recognizing printed words. |
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Dehaene;
Reading in the Brain |
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Our neuronal
networks are literally "recycled"
for reading. |
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Dehaene;
Reading in the Brain |
2 |
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The insight into how literacy changes the brain is profoundly transforming our vision
of education and learning disabilities. |
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Dehaene;
Reading in the Brain |
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New remedial
programs are being conceived that should, in
time, cope with the debilitating incapacity to decipher words known as dyslexia. |
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Dehaene;
Reading in the Brain |
3 |
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It is now clear that the dyslexic brain is subtly different from the brain of
a normal reader. |
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Dehaene;
Reading in the Brain |
4 |
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The
literate brain contains specialized cortical mechanisms
that are exquisitely tuned to the recognition of written words. |
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Dehaene;
Reading in the Brain |
4 |
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The human
mechanisms for reading are systematically housed in a brain regions as though they were as a cerebral
organ for reading. |
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Dehaene;
Reading in the Brain |
4 |
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Writing was
born only 5400 years ago in the Fertile Crescent, and the alphabet itself is only 3800 years old. |
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Dehaene;
Reading in the Brain |
4 |
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Evolution did not have time to
develop specialized reading circuits in Homo sapiens. |
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Dehaene;
Reading in the Brain |
4 |
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Our brain
is built on the genetic blueprint that allowed our hunter gatherer
ancestors to survive. |
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Dehaene;
Reading in the Brain |
4 |
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Reading
uses a primate brain
originally designed for life in African savanna. |
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Dehaene;
Reading in the Brain |
4 |
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Nothing in our evolution could have prepared us
to absorb language through vision. |
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Dehaene;
Reading in the Brain |
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Brain imaging
demonstrates that the adult brain contains fixed circuitry exquisitely
attuned to reading. |
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Dehaene;
Reading in the Brain |
5 |
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All sorts of imperfection attests that evolution is not guided by an intelligent
creator, but follows
random paths in the struggle
for survival. |
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Dehaene;
Reading in the Brain |
6 |
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Cerebral circuits for reading demonstrate that the brain is adaptable to culture. |
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1 |
Dehaene;
Reading in the Brain |
7 |
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Part of our visual
system is not hardwired, but remains open to changes induced by the environment. |
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Dehaene;
Reading in the Brain |
7 |
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Within an otherwise well structured brain, visual
plasticity gave the ancient scribes the opportunity to
invent reading. |
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Dehaene;
Reading in the Brain |
7 |
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Cultural acquisition arrives on the fringe of brain plasticity. |
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Dehaene;
Reading in the Brain |
7 |
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Our brain
adapts to a given culture by minimally turning its predispositions to a different use. |
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Dehaene;
Reading in the Brain |
7 |
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When we learn a new skill, we'll recycle some of our old primate brain
circuits, in so far as those circuits can tolerate the change. |
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Dehaene;
Reading in the Brain |
8 |
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Our brain was not designed for reading, but recycles some of its circuits for this novel
cultural activity. |
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Dehaene; Reading in the Brain |
9 |
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The uniqueness
of our species may arise from a combination of two factors -- (1) a theory
of mind (the ability to imagine the mind of others) and (2) a
conscious global workspace (an internal buffer where the infinite variety of ideas can be recombined). |
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Dehaene;
Reading in the Brain |
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Mechanisms inscribed in our genes conspire to make us the only cultural species. |
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Dehaene;
Reading in the Brain |
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Reading,
although a recent
invention,
lay dormant for millennia within the envelope of
potentialities
inscribed in our brains. |
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1 |
Dehaene;
Reading in the Brain |
30 |
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English is
an abominably irregular language. |
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Dehaene;
Reading in the Brain |
30 |
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Irregularities of English
spelling. |
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Dehaene;
Reading in the Brain |
31 |
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In the Italian language, every letter maps into a single phoneme, with virtually no exceptions. |
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Dehaene;
Reading in the Brain |
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English spelling could be
simplified. |
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Dehaene;
Reading in the Brain |
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English spelling failed to evolve in spite of the natural
drift of oral language. |
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Dehaene;
Reading in the Brain |
32 |
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English language contains many
more speech sounds than Italian. |
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Dehaene;
Reading in the Brain |
32 |
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The number of English phonemes ranges from 40 to 45, depending on speakers and counting methods, while Italian
has only 30. |
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Dehaene;
Reading in the Brain |
32 |
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Vowels and diphthongs are particularly abundant in English. |
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Dehaene;
Reading in the Brain |
32 |
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Languages
with a great many phonemes, such as English and French. |
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Dehaene;
Reading in the Brain |
33 |
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Turkey in
the space of one year (1928-29) adopted the Roman
alphabet,
drastically simplified its spelling, and taught 3 million people how to read. |
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Dehaene;
Reading in the Brain |
38 |
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All writing systems oscillate between an accurate representation of sound and a fast transmission of meaning. |
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Dehaene;
Reading in the Brain |
38 |
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Two information processing
pathways in the brain coexist and supplement each other while we read. |
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Dehaene;
Reading in the Brain |
39 |
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Word reading
proceeds along several parallel processing routes. (diagram) |
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Dehaene;
Reading in the Brain |
40 |
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Two quite distinct pathways for reading -- (1) direct route, from letters to words and their meaning, (2) indirect route, from letters to sounds and from sounds to meanings. |
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Dehaene;
Reading in the Brain |
40 |
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Fluent reading relies on the close knit
coordination of the two
reading routes. |
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Dehaene;
Reading in the Brain |
41 |
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Mental Dictionaries |
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Dehaene;
Reading in the Brain |
41 |
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As proficient
readers, we all possess a lexicon of English spelling that
lists the written forms of all the words we know from the past. |
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Dehaene;
Reading in the Brain |
41 |
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Orthographic memories of word
spellings are
probably stored in the form of hierarchical trees of letters, graphemes, syllables, and morphemes. |
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Dehaene;
Reading in the Brain |
41 |
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We also maintain a separate "phonological lexicon," a mental dictionary of the pronunciation
of words. |
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Dehaene;
Reading in the Brain |
41 |
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We also have a grammatical store that specifies words as a noun, that its plural is regular, etc. |
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Dehaene;
Reading in the Brain |
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Each word
is associated with dozens of semantic features that specify its meaning. |
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Dehaene;
Reading in the Brain |
42 |
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A standard
dictionary has about 100,000
entries, and any English
speaker knows about 40,000
or 50,000 of them. |
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Dehaene;
Reading in the Brain |
42 |
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Any reader easily retrieves a single meaning of at least 50,000 candidate
words, in the space of a few tenths of a second, based on
nothing more than a few strokes of light on the retina. |
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Dehaene;
Reading in the Brain |
44 |
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The human brain is the archetype of a massively parallel system where all neurons compute simultaneously. |
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Dehaene;
Reading in the Brain |
49 |
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Word decoding
does not proceed in a strictly sequential manner, and the time needed to read a word is not related to the number of letters that it
contains. |
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Dehaene;
Reading in the Brain |
49 |
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Studies of human
reading suggests that the reader's brain behaves much like a
mental Senate. The recognition
of a word requires multiple cerebral systems to agree on an ambiguous
interpretation of the visual input. The time that it takes to read a word depends primarily on
the conflicts and conditions that it sets into motion in the cortical architecture. |
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Dehaene; Reading in the Brain |
49 |
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Experimental psychologists have
discovered that conflicts can occur at all levels of word processing. Within the lexicon,
words have been shown
to compete against their neighbors, or with words that are so
similar that they have all
but one letter in common. |
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Dehaene;
Reading in the Brain |
49 |
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Experiments show that the relative frequency of a word's neighbors plays a crucial
role in the time it takes us to recognize it. |
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Dehaene;
Reading in the Brain |
51 |
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Reading can be broken down into a sequence of information processing stages. From information processing in the retina to invariant letter recognition, access to pronunciation, morpheme recognition, all the way up to conflict resolution within the lexicon, the efficiency of the human mechanism for
reading is impressive. |
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Dehaene; Reading in the Brain |
51 |
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The
parallel processing of all of a word's characters, the resolution of ambiguities, the
immediate access to one out of perhaps 50,000
words in a mental
lexicon, all point to the remarkable adaptation of our brain to the task of reading. |
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Dehaene;
Reading in the Brain |
51 |
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How can our brain be so well
adapted to a problem for which he could not possibly have evolved? |
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Dehaene;
Reading in the Brain |
51 |
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There is a specific
cortical area for written
words, much like the primary
auditory cortex area or the motor cortex. |
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Dehaene;
Reading in the Brain |
53 |
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The Brain's Letterbox |
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Dehaene;
Reading in the Brain |
58 |
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The human brain contains specific reading areas that
transmit information about the identity of a
letter string to the brain's
language regions. |
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5 |
Dehaene;
Reading in the Brain |
59 |
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After a stroke, a patient can lose the ability
to read and thus become
alexic. (diagram) |
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Dehaene;
Reading in the Brain |
61 |
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Early stages
of visual analysis are not unique to reading, but contribute to the visual
recognition of any shape,
color, or object. |
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Dehaene;
Reading in the Brain |
62 |
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The critical site for pure alexia lies a few centimeters to the front of the occipital pole, on the bottom side of the
left hemisphere. |
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Dehaene; Reading in the Brain |
62 |
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Anatomists call the area for pure alexia the left occipito-temporal area, because it
lies at the boundary
of the occipital and temporal lobes of the brain, within a groove in the cortical mantle called
the lateral occipito-temporal sulcus. |
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Dehaene;
Reading in the Brain |
62 |
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In this book that critical site for pure alexia will be referred to as the "brain's letterbox," a
term that expresses what the authors believe the region does. |
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Dehaene;
Reading in the Brain |
62 |
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The brain's
letterbox area plays
a crucial role in the fast identification of the letter string and its transmission to the higher
areas that compute pronunciation and meaning. |
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Dehaene;
Reading in the Brain |
62 |
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The visual
recognition of the letters rests primarily in a distinct "letterbox"
area on the brain's
lower side. |
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Dehaene; Reading in the Brain |
62 |
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Three ways for lesions to
prevent normal function of the visual cortical form area -- (1) disruption by direct lesion, (2) disconnected upstream and thus
deprived of visual inputs, (3) disconnected downstream so it cannot send outgoing
messages to other
brain regions. |
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Dehaene;
Reading in the Brain |
64 |
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Written
words enter occipital
pole in the form of visual
patterns, and are then sent to the angular gyrus to make contact with
the visual images of words, then propagated to Wernicke's
area, the seat of auditory
images for words, then on the Broca's area, where articulation patterns are
retrieved, and finally to the motor cortex, which controls muscles. |
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Dehaene;
Reading in the Brain |
64 |
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All the brain's
regions operate simultaneously and in tandem, and their messages constantly crisscross each other. All the connections are bidirectional. |
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Dehaene;
Reading in the Brain |
65 |
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Even though we have a number of imaging tools for the brain, we are still unable to assign precise functions to each region, because they all operate simultaneously and interact with each other at fast speeds. |
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Dehaene;
Reading in the Brain |
65 |
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It is unclear if scientists will ever fully understand the reader's brain, and achieve an intuitive grasp on so much complex circuitry. |
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Dehaene;
Reading in the Brain |
65 |
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The brain's
visual input area occupies a strategic location
and is a funnel through which all visual
information about written
words seemed to flow before all of it is distributed to a great variety of left hemispheric areas. |
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Dehaene;
Reading in the Brain |
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