On the spatial reference frames used during covert movement preparation: evidence from lateralized ERP components.

Elena Gherri, Bettina Forster

Research output: Contribution to conferencePosterpeer-review

Abstract

The anterior directicting attention negativity (ADAN) and the late directing attention positivity (LDAP) event-related potential (ERP) components elicited during covert shifts of spatial attention operate according different spatial coordinate systems. While the LDAP is based on external spatial coordinates, the ADAN operates on anatomically defined spatial codes. These components have been consistently found not only during covert shifts of spatial attention but also during covert movement preparation, suggesting that common mechanisms are involved in the control of spatial attention and action.
The present study investigated whether the ADAN elicited during covert movement preparation operates within anatomically defined spatial coordinates. Lateralized ERP components were recorded during a response precuing paradigm where precues indicated the side of the motor response. In different blocks, hands were uncrossed or crossed, so that external and anatomical codes were either congruent or incongruent. With uncrossed hands, the ADAN was elicited contralateral to the side of a cued motor response. In contrast to previous studies on covert shifts of spatial attention, the ADAN did not reverse polarity with crossed relative to uncrossed hands, suggesting that this component does not operate within anatomically defined spatial coordinates during covert movement preparation. These results provide the first evidence that the anterior processes involved in spatial attention and action may use different spatial coordinate systems depending on the specific task being performed.
Original languageEnglish
Publication statusPublished - 2010
EventSociety for Psychophysiological Research, 50th Annual Meeting - Oregon, Portland , United Kingdom
Duration: 29 Sep 20093 Oct 2009

Conference

ConferenceSociety for Psychophysiological Research, 50th Annual Meeting
Country/TerritoryUnited Kingdom
City Portland
Period29/09/093/10/09

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