John
Searle; Mystery of Consciousness |
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Consciousness
(common sense definition) - refers to those
states of sentience
and awareness that
typically begin when we awake from a dreamless
sleep and continue until we go to sleep again, or fall into a coma or die or otherwise become "unconscious". |
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Dreams are
a form of consciousness. |
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Within the field of consciousness there are states of intensity ranging from drowsiness to full awareness. |
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Humans and higher animals are obviously conscious, but we do not know how far down the phylogenetic
scale consciousness extends. |
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Consciousness
vs. self-consciousness |
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All conscious phenomena are qualitative, subjective experiences,
and hence are qualia. |
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Brains can
have consciousness as
an emergent property. |
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Simulation
of mental
states is no more a mental state than the
simulation of an explosion is itself an explosion. |
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All of our conscious
experiences are explained by the behavior of neurons and are
themselves emergent properties of the system of neurons. |
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Though each
neuron receives both excitatory and inhibitory signals, each neuron sends out
only one or the other type of signal. |
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Our entire
mental life is caused by the behavior of neurons, and all they do is increase or decrease their rates of firing. |
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Reference Francis Crick:
solution to the binding problem, synchronized firing of spatially separated neurons
that are responsive to different features of an
object. Neuron
assemblies responsive to shape, color, movement, etc. fire in synchrony at about 40 Hz. |
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Reference Francis Crick: thalamus plays a central role in consciousness, synchronized firing in the range
of 40 Hz in networks
connecting the thalamus and the cortex, especially layers four and six. |
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Of the neurobiological
theories of consciousness, John Searle believes
the most impressively worked out and the most profound is that of Gerald Edelman. |
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Crick uses the binding problem
for visual perception as entry wedge for consciousness; Edelman uses
categorization as his entry wedge. |
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Edleman's notion of maps. Human
visual system comprises over thirty maps in the visual cortex. |
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Edelman's "Neuronal Group
Selection": Brain is genetically
equipped from birth with an overabundance of neuronal groups,
develops by a mechanism similar to Darwinian natural selection; some neuronal groups die out; others survive and are strengthened. |
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In some parts of the brain, as
many as 70 percent of the neurons die before the brain reaches maturity. |
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Unit that gets selected is not
the individual neuron, but neuronal groups of hundreds to millions of cells. |
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Edelman's idea about reentry:
Reentry is a process by which parallel signals go back and forth between
maps. |
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Reentry is not just feedback;
reentry is many parallel pathways operating simultaneously. |
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Edelman's reasoning: perceptual
categories begin with shapes, color, movement, and eventually to objects and
abstract general concepts. |
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Memory for Edelman is not just a
passive process of storing but an active process of recategorizing on the
basis of privious categorizations. |
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Memory recategorizes the input
by enhancing the priviously established categorization. This involves changes
in the population of synapses in the global mapping. It does not just recall
a stereotype but continually reinvents the category. |
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Edelman's conception of memory,
one of his theory's most powerful features; alternative to the traditional
idea of memory as a storehouse of knowledge and experience, and of
remembering as a process of retrieval from the storehouse. |
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Edelman's concept of learning: Learning is a matter of changes in behavior that are based
on categorizations
governed by positive and negative values. |
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Primary
consciousness
results from the
interaction in real time between memories of past value category
correlations
and present world input as it is categorized
by global mappings. |
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Consciousness is an outcome of a recursively
comparative memory in which previous
self-non-self categorizations are continually
related to ongoing
present perceptual categorizations. |
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High-order
consciousness can only be developed on the basis
of primary consciousness,
in order to develop such high-order capacities as language and symbolism. |
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The whole set of interlocking
systems produces consciousness
by way of reentrant mappings. |
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Qualitative states of sentience or awareness that all of us have --
what some philosophers call "qualia". |
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Edelman and Crick share the
basic conviction that to understand the mind and consciousness, we must
understand in detail how the brain works. |
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Daniel
Dennett's book Consciousness
Explained is a work in the tradition of behaviorism. |
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In his book Consciousness
Explained, Dennett denies the existence of
consciousness. For him it refers only
to third-person phenomena, not to the first person conscious feelings and experiences we all have. |
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Dennett's objective science of consciousness is not about
consciousness, but rather a third-person account of external behavior. |
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We know that certain brain
functions are sufficient for
consciousness, but we have no way of knowing at present whether they are also
necessary. |
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