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Abstract:
Widely distributed cortical circuits have been implicated in
most models of working memory. Although we are beginning to
understand the gross anatomical components of those circuits, the
dynamic fashion in which they interact is still largely unknown.
One of our goals is to learn how different regions of the brain
interact to give rise to the perception of and short term memory
for auditory rhythms. In previously reported results, we
demonstrated spectrotemporal correlates of auditory working memory
using wavelet transforms of the simultaneously recorded EEG. In the
present study, we extend the wavelet metrics to examine the role of
both temporal lobes in the working memory task. Joint
spectrotemporal energy in left-right paired electrodes is
significantly lower in the working memory task than in a
discrimination control task, and lower still if the delay over
which the subject must maintain the stimuli is extended. The data
suggests that the left and right temporal lobes become functionally
less coupled as demands placed upon them are increased.
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