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September 13, 2006Journal of NeuroscienceOpen Access

α-Band Electroencephalographic Activity over Occipital Cortex Indexes Visuospatial Attention Bias and Predicts Visual Target Detection

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Authors

GTGregor ThutUniversity of GenevaANAnnika NietzelBeth Israel Deaconess Medical CenterSBStephan A. BrandtStony Brook University

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Overview

Neurophysiological experiment demonstrates that posterior alpha-band lateralization predicts visual target detection speed, suggesting oscillatory rhythms reflect spatial attention biases.

Key Points

  • To investigate how preparatory modulations of posterior alpha-band electroencephalographic activity relate to behavioral performance during covert shifts of visuospatial attention.
  • Recorded electroencephalography (EEG) during a spatial attention orienting paradigm without concurrent visual stimulation.
  • Tracked covert attention directed toward left or right peripheral positions and measured oscillatory alpha-band (8–14 Hz) power over left versus right posterior cortical sites.
  • Calculated a posterior alpha lateralization index to correlate preparatory oscillatory shifts with target detection speeds.
  • Covert attention shifts modulated posterior alpha-band activity, characterized by maximal alpha power decreases contralateral to the attended visual hemifield.
  • Alpha lateralization differed significantly between directions, with negative values marking leftward attention and more positive values marking rightward attention.
  • Pre-target lateralization indices predicted reaction times across trials, with the fastest target detection occurring when pre-target alpha bias matched target location.

Cite This Study

Thut et al. (2006) studied this question.

synapsesocial.com/papers/69dd5a7f7808b00a4799ce4fhttps://doi.org/10.1523/jneurosci.0875-06.2006
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