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Effects of memory load on interhemispheric relay

C M Braun1, A Dumas, I Colin

  • 1Université du Québec à Montréal.

The American Journal of Psychology
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

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This study found interhemispheric transfer time (ITT) is not sensitive to memory load using the Poffenberger paradigm. However, women showed longer ITT than men, suggesting sex differences in brain structure.

Area of Science:

  • Cognitive Neuroscience
  • Neuropsychology
  • Human Brain Imaging

Background:

  • Interhemispheric cooperation, or bilateral advantage, is thought to increase with task complexity and memory load.
  • Previous tachistoscopic studies using the Poffenberger paradigm have yielded inconclusive results regarding interhemispheric transfer time (ITT).

Purpose of the Study:

  • To investigate the sensitivity of the Poffenberger paradigm to memory load.
  • To examine interhemispheric transfer time (ITT) in relation to varying memory loads.
  • To explore potential sex differences in interhemispheric processing.

Main Methods:

  • A modified Sternberg memory scanning task was employed within the Poffenberger paradigm.
  • Participants performed a go/no-go task with memory set sizes ranging from one to four items.

Related Experiment Videos

  • Reaction times were analyzed to calculate interhemispheric transfer time (ITT).

    • Main Results:

    • A significant effect of memory load was observed, but the interaction between field/hand and load was not significant.
    • The Poffenberger paradigm did not show ITT to be reliably sensitive to increasing memory load.
    • Significantly longer ITT was found in women compared to men.

    Conclusions:

    • The interhemispheric transfer time (ITT) metric derived from the Poffenberger paradigm may not be a reliable indicator of memory load.
    • Findings suggest potential sex differences in commissural anatomy and physiology, impacting interhemispheric communication.