klab.caltech.edu

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Definitions (146)

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fusiform gyrus


The fusiform gyrus lies on the inferior surface of cortex, extending from the occipital to the temporal lobe (see inferior temporal cortex
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definitions


of terms relating to the study of consciousness and the brain
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by


Professor Christof Koch
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this is a useful compendium of definitions of terms and expressions that arise in the study of the brain


in the book The Quest for Consciousness
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40 hz oscillations


Periodic variation in the local field potential
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access consciousness


The philosopher Ned Block distinguishes, on conceptual grounds, access consciousness from phenomenal consciousness (Block, 1999, 2005). Phenomenal consciousness corresponds to the subjective feeling of seeing red (as compared to the feeling of seeing green), while access consciousness is what is made accessible to multiple cognitive processes, incl [..]
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achromatopsia


A specific deficit in the perception of colors due to cortical lesions in the fusiform gyrus. Action Potential
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activity principle


A hypothesis according to which underlying every direct percept---seeing red, smelling wet moss, the feeling of initiating an action--there will be one or more groups of neurons that explicitly represent the different attributes of this percept (see explicit coding
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aftereffect


Prolonged exposure to a stimulus attribute causes a short lived deficit in the ability to detect that attribute (as in the orientation-dependent aftereffect). In some cases, the opposite attribute is seen, as in the motion aftereffect where the observer sees upward motion after being habituated to downward motion (also known as the waterfall illusi [..]
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anterior cingulate cortex


Part of the central executive in the frontal lobe that may be key to the NCC. The ACC monitors complex behaviors and is particularly active when incorrect behavior or errors occur. Ascending reticular activation system
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