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Abstract:
Abstract: Episodic memory was investigated in a recognition
memory paradigm involving source judgments. EEG was recorded from
32 sites on 36 subjects. Topographic ERP analysis revealed two
temporally distinct old/new effects: one with a posterior
distribution and the other with a right frontal orientation. We
applied Subprofile Scaling Model (SSM) to EEG spectral data to
reveal the relationship between patterns of regional interactions
(network) and individual task performance. During the study phase
of the experiment, subject viewed lists of noun pairs contained
within sentences. Subjects studied two temporally distinct lists of
sentences. During test, subjects saw old and novel nouns and made
old/new judgments, followed by source judgements. Alpha power in
lower (7-10 Hz: aL) and upper (10-13.3 Hz: aU) bands were analyzed.
In a contrast of correct old and new judgements, SSM analysis of aL
revealed a network whose subject scores were significantly
correlated with individual differences in recognizing old items.
Alpha attenuation in posterior sites was associated with higher
accuracy. In a contrast of correct versus incorrect source
attribution, analysis of aU revealed a network whose subject scores
were significantly correlated with accuracy in distinguishing old
and new items. Alpha attenuation in frontal sites was associated
with higher accuracy. Topographic spectral analysis suggests that
subject accuracy in recognition memory is specifically related to
activity in a bilateral frontal network associated with correct
source attribution.
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