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J Neurosci. 2019 May 8;39(19):3728-3740. doi: 10.1523/JNEUROSCI.2764-18.2019. Epub 2019 Mar 4.

Differential Brain Mechanisms of Selection and Maintenance of Information during Working Memory.

Author information

1
Human Cortical Physiology and Neurorehabilitation Section, NINDS, NIH, Bethesda, Maryland 20892, rom.quentin@gmail.com.
2
New York University, New York, New York 10003, and.
3
Frankfurt Institute for Advanced Studies, 60438 Frankfurt am Main, Germany.
4
Human Cortical Physiology and Neurorehabilitation Section, NINDS, NIH, Bethesda, Maryland 20892.

Abstract

Working memory is our ability to select and temporarily hold information as needed for complex cognitive operations. The temporal dynamics of sustained and transient neural activity supporting the selection and holding of memory content is not known. To address this problem, we recorded magnetoencephalography in healthy participants performing a retro-cue working memory task in which the selection rule and the memory content varied independently. Multivariate decoding and source analyses showed that selecting the memory content relies on prefrontal and parieto-occipital persistent oscillatory neural activity. By contrast, the memory content was reactivated in a distributed occipitotemporal posterior network, preceding the working memory decision and in a different format than during the visual encoding. These results identify a neural signature of content selection and characterize differentiated spatiotemporal constraints for subprocesses of working memory.SIGNIFICANCE STATEMENT Our brain selects and maintains information during short time windows in a way that is essential to reasoning and learning. Recent advances in multivariate analysis of brain activity allowed the characterization of brain regions that stores the memory. We applied multivariate analysis to time-resolved brain signals to characterize the spatiotemporal signature underlying these subprocesses. The selection of information relies on sustained oscillatory activity in a network that includes the ventrolateral prefrontal cortex while memory content is transiently replayed in an occipitotemporal network that differs from encoding. Our results characterized differentiated spatiotemporal activity underlying encoding, selection, and maintenance of information during working memory.

KEYWORDS:

MVPA; decoding; magnetoencephalography; selection rule; temporal dynamics; working memory

PMID:
30833510
PMCID:
PMC6510345
[Available on 2019-11-08]
DOI:
10.1523/JNEUROSCI.2764-18.2019

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