October 2020
Volume 20, Issue 11
Open Access
Vision Sciences Society Annual Meeting Abstract  |   October 2020
The temporal dynamics of information integration within and across the hemispheres
Author Affiliations
  • Amanda K Robinson
    School of Psychology, The University of Sydney
  • Tijl Grootswagers
    School of Psychology, The University of Sydney
  • Sophia Shatek
    School of Psychology, The University of Sydney
  • Marlene Behrmann
    Department of Psychology, Carnegie Mellon University
    Center for the Neural Basis of Cognition, Carnegie Mellon University
  • Thomas A Carlson
    School of Psychology, The University of Sydney
Journal of Vision October 2020, Vol.20, 1016. doi:https://doi.org/10.1167/jov.20.11.1016
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      Amanda K Robinson, Tijl Grootswagers, Sophia Shatek, Marlene Behrmann, Thomas A Carlson; The temporal dynamics of information integration within and across the hemispheres. Journal of Vision 2020;20(11):1016. doi: https://doi.org/10.1167/jov.20.11.1016.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

The human brain must integrate information across the left and right hemispheres to construct a coherent representation of the perceptual world. Characterising how visual information from the left and right visual fields is represented in the two hemispheres can inform information transfer in the brain. Previous work on this topic has focused on the dynamics of neural activation but it has been difficult to determine what information is being encoded within each hemisphere. Here, we investigated information processing within each hemisphere and the degree to which the information is distinct or redundant across hemispheres. We presented participants (N = 20) with images of faces, words and other objects in rapid serial visual presentation sequences while their neural responses were measured using electroencephalography (EEG). Crucially, stimuli were presented either centrally or lateralised to the left and right visual fields. Participants performed an orthogonal colour change task on three dots that marked possible image positions. Multivariate pattern decoding methods were applied to the EEG data to assess the coding of object information in the brain, separately for electrode clusters over each hemisphere. As expected, stimulus information was more robust and emerged earlier in the contralateral hemisphere than the ipsilateral hemisphere. Interestingly, the temporal dynamics of information within the contra and ipsilateral hemispheres followed different trajectories. We further showed that representational structure aligned across the two hemispheres at approximately 200ms. These results provide new insights into the dynamics of object perception and the competitive versus cooperative nature of hemispheric processing.

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