Research Repository

The speed of parietal theta frequency drives visuospatial working memory capacity

Wolinski, Nina and Cooper, Nicholas R and Sauseng, Paul and Romei, Vincenzo (2018) 'The speed of parietal theta frequency drives visuospatial working memory capacity.' PLoS Biology, 16 (3). ISSN 1544-9173

[img]
Preview
Text
The speed of parietal theta frequency drives visuospatial working memory capacity.pdf - Published Version
Available under License Creative Commons Attribution.

Download (4MB) | Preview

Abstract

The speed of theta brain oscillatory activity is thought to play a key role in determining working memory (WM) capacity. Individual differences in the length of a theta cycle (ranging between 4 and 7 Hz) might determine how many gamma cycles (>30 Hz) can be nested into a theta wave. Gamma cycles are thought to represent single memory items; therefore, this interplay could determine individual memory capacity. We directly tested this hypothesis by means of parietal transcranial alternating current stimulation (tACS) set at slower (4 Hz) and faster (7 Hz) theta frequencies during a visuospatial WM paradigm. Accordingly, we found that 4-Hz tACS enhanced WM capacity, while 7-Hz tACS reduced WM capacity. Notably, these effects were found only for items presented to the hemifield contralateral to the stimulation site. This provides causal evidence for a frequency-dependent and spatially specific organization of WM storage, supporting the theta–gamma phase coupling theory of WM capacity.

Item Type: Article
Subjects: R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Divisions: Faculty of Science and Health > Psychology, Department of
Depositing User: Elements
Date Deposited: 03 Sep 2018 14:03
Last Modified: 03 Sep 2018 14:15
URI: http://repository.essex.ac.uk/id/eprint/22203

Actions (login required)

View Item View Item