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Trends Cogn Sci. 2006 Nov;10(11):487-93. Epub 2006 Oct 2.

Mechanisms underlying working memory for novel information.

Author information

1
Center for Memory and Brain, Department of Psychology and Program in Neuroscience, Boston University, 2 Cummington Street, Boston, MA 02215, USA. hasselmo@bu.edu

Abstract

In this Opinion article we describe a theory that the brain mechanisms underlying working memory for novel information include a buffer in parahippocampal cortices. Computational modeling indicates that mechanisms for maintaining novel information in working memory could differ from mechanisms for maintaining familiar information. Electrophysiological data suggest that the buffer for novel information depends on acetylcholine. Acetylcholine activates single-cell mechanisms that underlie persistent spiking of neurons in the absence of synaptic transmission, allowing maintenance of information without prior synaptic modification. fMRI studies and lesion studies suggest that parahippocampal regions mediate working memory for novel stimuli, and the effects of cholinergic blockade impair this function. These intrinsic mechanisms in parahippocampal cortices provide an important alternative to theories of working memory based on recurrent synaptic excitation.

PMID:
17015030
PMCID:
PMC2253490
DOI:
10.1016/j.tics.2006.09.005
[Indexed for MEDLINE]
Free PMC Article
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