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Attentional interaction in the split-brain: evidence from negative priming

A J Lambert1

  • 1Department of Psychology, University of Auckland, New Zealand.

Neuropsychologia
|April 1, 1993
PubMed
Summary

Negative priming, where ignored stimuli slow responses, was studied in split-brain patients. Findings show attentional interactions persist even with severed brain hemispheres, impacting cognitive processing.

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Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Psychology

Background:

  • Negative priming is an inhibitory cognitive process where response time increases for a target preceded by an ignored, but related, distractor.
  • This phenomenon is crucial for maintaining attentional focus and guiding attentional orientation.
  • Understanding negative priming sheds light on interhemispheric communication and attentional control mechanisms.

Purpose of the Study:

  • To investigate the presence and extent of negative priming in split-brain patients.
  • To determine if attentional interactions occur between hemispheres in individuals with a severed corpus callosum.
  • To explore the neural underpinnings of attentional processing in split-brain conditions.

Main Methods:

  • A negative priming paradigm was adapted, presenting visual stimuli to either the right visual field (RVF) or left visual field (LVF).

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  • Participants, including two split-brain patients and seven healthy controls, performed a digit categorization task (odd/even) on RVF stimuli while ignoring LVF stimuli.
  • Response times and accuracy were measured to assess priming effects.

    • Main Results:

    • Both split-brain patients exhibited significant negative priming effects from ignored LVF distractors.
    • Normal control subjects also demonstrated significant negative priming, consistent with previous research.
    • The results indicate that attentional interactions are preserved across hemispheres in split-brain individuals.

    Conclusions:

    • Complex attentional interactions occur between cerebral hemispheres even after surgical separation in split-brain patients.
    • These interactions likely involve both cortical and subcortical processing pathways.
    • The findings suggest a neural basis for the integrated behavior observed in split-brain patients during daily activities.