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Measuring the Switch Cost of Smartphone Use While Walking
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A toggle switch of visual awareness?

Ada Le1, Bobby B Stojanoski1, Saniah Khan1

  • 1Department of Psychology, University of Toronto Scarborough, Toronto, ON, Canada.

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Researchers discovered that the human brain rapidly shifts attention between hemispheres using a "toggle switch" mechanism. This explains why right-hemisphere damage often causes neglect, revealing distinct roles in spatial attention.

Keywords:
AttentionEEGInterhemispheric competitionPseudoneglectRight hemisphere

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Brain Imaging

Background:

  • The syndrome of neglect, characterized by ignoring one half of space, typically results from right-hemisphere damage, suggesting hemispheric asymmetry in spatial attention.
  • Previous studies in healthy individuals showed minimal differences in attentional processing between the left and right hemispheres.

Purpose of the Study:

  • To investigate the temporal dynamics of interhemispheric interactions during spatial attention tasks.
  • To elucidate the distinct roles of brain hemispheres in attentional allocation and visual awareness.

Main Methods:

  • Utilized electroencephalography (EEG) to map cortical activity with millisecond precision.
  • Developed a task optimized to reveal subtle differences in attentional functions between hemispheres.

Main Results:

  • Identified transient periods (20-30 ms) of interhemispheric competition.
  • Observed rapid, sequential phases of right-sided dominance within the ventral attentional network.
  • Demonstrated that neural resources are quickly allocated to one hemisphere, akin to a toggle switch.

Conclusions:

  • The findings provide the first evidence of rapid interhemispheric interactions governing attentional resource allocation.
  • This mechanism helps explain the lateralization of neglect syndrome following right-hemisphere damage.
  • Highlights the dynamic, time-sensitive nature of hemispheric specialization in attention.