Effects of pointing direction and direction predictability on event-related lateralizations of the EEG

Isabelle Berndt, Volker H. Franz, Heinrich H. Bülthoff, Edmund Wascher

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In two experiments, we investigated hemispheric electroencephalography (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 lateralizations 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. Event-related lateralizations (ERLs) varied with pointing direction. This was true across changes in target eccentricity and pointing distance. Foci of the ERLs were in premotor and posterior parietal cortex, which might reflect the critical involvement of these areas in the control of visually guided reaching. Direction predictability reduced the parietal and premotor ERL before pointing onset, probably reflecting a lesser effort in visuomotor transformation. Predictability also added an overlying N2pc component to the early ERL after target onset and increased direction effects during movement.

Original languageEnglish
Pages (from-to)75-98
Number of pages24
JournalHuman Movement Science
Volume21
Issue number3
DOIs
Publication statusPublished - 2002 Sep

Keywords

  • Electroencephalography
  • Event-related lateralizations
  • Pointing direction
  • Pointing movements

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Experimental and Cognitive Psychology

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