Exploring the temporal dynamics of the spatial working memory n-back task using steady state visual evoked potentials (SSVEP)

Abstract

The neural networks associated with spatial working memory (SWM) are well established. However, the temporal dynamics of SWM-related brain activity are less clear. This study examined changes in temporal neurophysiology during the spatial n-back task using steady state probe topography (SSPT) to record cortical steady state visual evoked potentials (SSVEPs) at 64 scalp locations. Twenty healthy male volunteers participated in the study. The findings identified three different time periods of significance during the spatial n-back task - an early perceptual/encoding period (approximately 0-500 ms), an early delay period just following the stimulus disappearing from view (approximately 850-140..