Jean Francois Delvenne
An electrophysiological measure of visual short-term memory capacity within and across hemifields
Delvenne, Jean Francois; Kaddour, Laura A.; Castronovo, Julie
Laura A. Kaddour
Dr Julie Castronovo J.Castronovo@hull.ac.uk
Senior Lecturer in Psychology, Director of Education Faculty of Health Sciences
Recent electrophysiological research has identified a specific contralateral correlate of the contents of visual short-term memory (VSTM). This posterior contralateral delay activity (CDA) persists during the retention period, and its amplitude is modulated by the number of items held at any one time. Here we show that, despite the contralateral nature of this activity, its amplitude is modulated by the number of objects from both hemifields. When objects from one side of the visual field are held in memory, CDA activity increased for arrays of one, two, and three objects, but stopped getting larger for arrays of four objects. However, when objects from both sides are memorized at the same time, CDA activity reached its asymptotic limit for arrays of two objects per side. These results suggest that, in spite of being contralaterally organized, VSTM is limited by the number of objects from both hemifields.
|Journal Article Type||Article|
|Peer Reviewed||Peer Reviewed|
|APA6 Citation||Delvenne, J. F., Kaddour, L. A., & Castronovo, J. (2011). An electrophysiological measure of visual short-term memory capacity within and across hemifields. Psychophysiology, 48(3), 333-336. doi:10.1111/j.1469-8986.2010.01079.x|
|Keywords||Visual working memory; Visual short-term memory; Capacity limits; Bilateral presentation; CDA; Event-related potentials|
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