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  Effects of Pointing Direction and Direction Predictability on Event-related Lateralisations of the EEG

Berndt, I., Franz, V., Bülthoff, H., & Wascher, E.(2001). Effects of Pointing Direction and Direction Predictability on Event-related Lateralisations of the EEG (88). Tübingen, Germany: Max Planck Institute for Biological Cybernetics.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-E276-D Version Permalink: http://hdl.handle.net/21.11116/0000-0006-C4E0-F
Genre: Report

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MPIK-TR-88.pdf (Publisher version), 3MB
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Berndt, I1, 2, Author              
Franz, V1, 2, Author              
Bülthoff, HH1, 2, Author              
Wascher, E, Author
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1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: In two experiments, we investigated hemispheric EEG differences in 9(12) healthy volunteers during pointing to lateral and central targets. The questions addressed were whether horizontal pointing direction and the predictability of pointing direction modulated hemispheric differences (event-related lateralisations of the EEG = ERLs). To vary pointing direction predictability, targets were displayed either randomly at one of nine different positions on a screen (‘random‘) or at the same horizontal position in five subsequent trials ("sequenced") while vertical positions varied randomly. ERLs varied with pointing direction. This was true across changes in target eccentricity and pointing distance. Foci of the ERLs were in premotor, motor and parietal cortex, reflecting the critical involvement of these areas in the control of visually guided reaching. Direction predictability reduced the parietal ERL before pointing onset, probably reflecting a lesser effort in visuomotor transformation. Predictability also added an additional component to the early ERLs after target onset and increased direction effects during movement.

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 Dates: 2001-06
 Publication Status: Published in print
 Pages: 19
 Publishing info: Tübingen, Germany : Max Planck Institute for Biological Cybernetics
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 Identifiers: Report Nr.: 88
BibTex Citekey: 1324
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Title: Technical Report of the Max Planck Institute for Biological Cybernetics
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Pages: - Volume / Issue: 88 Sequence Number: - Start / End Page: - Identifier: -