Journal article

Effects of mnemonic load on cortical activity during visual working memory: Linking ongoing brain activity with evoked responses

Tjeerd W Boonstra, Tamara Y Powell, Saeid Mehrkanoon, Michael Breakspear

INTERNATIONAL JOURNAL OF PSYCHOPHYSIOLOGY | ELSEVIER SCIENCE BV | Published : 2013

Abstract

The mechanisms generating task-locked changes in cortical potentials remain poorly understood, despite a wealth of research. It has recently been proposed that ongoing brain oscillations are not symmetric, so that task-related amplitude modulations generate a baseline shift that does not average out, leading to slow event-related potentials. We test this hypothesis using multivariate methods to formally assess the co-variation between task-related evoked potentials and spectral changes in scalp EEG during a visual working memory task, which is known to elicit both evoked and sustained cortical activities across broadly distributed cortical regions. 64-channel EEG data were acquired from eigh..

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