Serial representation of items during working memory maintenance at letter-selective cortical sites.

Abstract:

:A key component of working memory is the ability to remember multiple items simultaneously. To understand how the human brain maintains multiple items in memory, we examined direct brain recordings of neural oscillations from neurosurgical patients as they performed a working memory task. We analyzed the data to identify the neural representations of individual memory items by identifying recording sites with broadband gamma activity that varied according to the identity of the letter a subject viewed. Next, we tested a previously proposed model of working memory, which had hypothesized that the neural representations of individual memory items sequentially occurred at different phases of the theta/alpha cycle. Consistent with this model, the phase of the theta/alpha oscillation when stimulus-related gamma activity occurred during maintenance reflected the order of list presentation. These results suggest that working memory is organized by a cortical phase code coordinated by coupled theta/alpha and gamma oscillations and, more broadly, provide support for the serial representation of items in working memory.

journal_name

PLoS Biol

journal_title

PLoS biology

authors

Bahramisharif A,Jensen O,Jacobs J,Lisman J

doi

10.1371/journal.pbio.2003805

subject

Has Abstract

pub_date

2018-08-15 00:00:00

pages

e2003805

issue

8

eissn

1544-9173

issn

1545-7885

pii

pbio.2003805

journal_volume

16

pub_type

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