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Abstract:
fMRI was used to identify brain areas associated with
declarative and non-declarative memory. Participants initially
studied 4,0 dot patterns: eight repetitions of each of five
pattrerns in the declarative memory condition, and 40 distortions
of an underlying prototype dot pattern in the non-declarative
condition. fMRI data were collected while participants made yes/no
judgements to 72 dot patterns that alternated between predominantly
targets and predominantly foils. During the declarative memory task
(recognition memory), presentation of targets (vs. novel items)
resulted in significantly greater activity in the right visual
contex (BA 17, 18), bilateral temporal cortex (BA 21), the
cerebellum, and several areas in frontal cortex (BA R6,8,9,32; L9,
10). During the non-declarative task (judgement of category
membership), presentation of novel dot patterns that belonged to
the trained category (vs. novel items) resulted in significantly
reduced activity bilaterally in visual cortex (BA 17/18). The
market difference in activity in visual cortex between these two
tasks documents the independence of category judgements from
recognition judgements, and supports the distinction between
declarative and non-declarative memory.
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