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Related Experiment Video

Updated: Jul 13, 2026

Mapping Cortical Dynamics Using Simultaneous MEG/EEG and Anatomically-constrained Minimum-norm Estimates: an Auditory Attention Example
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Visuo-spatial neural response interactions in early cortical processing during a simple reaction time task: a

M M Murray1, J J Foxe, B A Higgins

  • 1Cognitive Neuroscience and Schizophrenia Program, Cognitive Neurophysiology Laboratory, Nathan Kline Institute for Psychiatric Research, 140 Old Orangeburg Road, Orangeburg, NY 10962, USA.

Neuropsychologia
|May 23, 2001
PubMed
Summary

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Neural interactions in visual processing occur rapidly, within 86 ms, influencing reaction times. These findings suggest faster interhemispheric communication than previously thought, impacting visual spatial processing.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Understanding neural interactions in visual processing is crucial for deciphering how the brain integrates information from different visual fields.
  • Previous research has explored the redundant target effect (RTE) but the precise timing and neural mechanisms of interactions across visual quadrants require further investigation.

Purpose of the Study:

  • To investigate the time course and scalp topography of neural interactions between stimuli presented in different visual quadrants.
  • To determine the role of probability summation in the redundant target effect (RTE).
  • To estimate the timing of interhemispheric transfer for visual stimuli.

Main Methods:

  • Recorded visual evoked potentials (VEPs) from 64 electrodes in 15 subjects during a reaction time (RT) task.

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Last Updated: Jul 13, 2026

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  • Compared VEPs from simultaneous stimulation of two quadrants ('pair') with the sum of VEPs from single stimuli in each quadrant ('sum') to identify neural interactions.
  • Utilized Miller's 'race' model inequality to analyze the redundant target effect (RTE) and employed scalp current density (SCD) analysis.

    • Main Results:

    • Neural interactions occurred within 72-86 ms post-stimulus over parieto-occipital regions, regardless of visual quadrant.
    • Reaction times were faster for stimulus pairs than single stimuli, consistent with the RTE, and fully accounted for by probability summation.
    • Interactions for bilateral stimulus pairs occurred within 86 ms, suggesting transcallosal volleys arrive earlier than previously estimated, with a ~10 ms delay compared to unilateral conditions.

    Conclusions:

    • Neural interactions in visual processing are rapid, occurring within 72-82 ms for unilateral and bilateral conditions, respectively.
    • Interhemispheric transfer of visual information occurs within 86 ms, earlier than previously calculated.
    • These findings provide insights into the temporal dynamics of visual information integration and interhemispheric communication.