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Related Experiment Videos

Attention and interhemispheric transfer: a behavioral and fMRI study.

B Weber1, V Treyer, N Oberholzer

  • 1University Hospital Zurich.

Journal of Cognitive Neuroscience
|February 11, 2005
PubMed
Summary
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Spatial attention influences interhemispheric transfer time, as measured by the crossed-uncrossed difference (CUD). Brain imaging revealed distinct areas involved in transfer and attention, including the corpus callosum and parietal cortex.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Manual reaction times (RTs) are faster when visual detection and response occur in the same hemisphere, attributed to interhemispheric transfer time.
  • The crossed-uncrossed difference (CUD) quantifies this transfer time by comparing RTs for crossed and uncrossed responses.

Purpose of the Study:

  • To investigate the role of spatial attention in modulating the CUD.
  • To identify brain regions associated with attentional effects on interhemispheric transfer.

Main Methods:

  • Manipulated the proportion of crossed and uncrossed trials to direct spatial attention towards contralateral or ipsilateral hemifields.
  • Utilized functional neuroimaging to analyze brain activity during interhemispheric transfer and attentional focusing.

Related Experiment Videos

Main Results:

  • An inverse correlation was observed between the proportion of crossed trials and CUD, indicating a significant role for spatial attention.
  • Brain imaging showed activation in the genu of the corpus callosum and cortical areas during interhemispheric transfer (crossed minus uncrossed).
  • Parietal area BA 7 and superior colliculi were activated during focused spatial attention.

Conclusions:

  • Spatial attention significantly affects interhemispheric transfer time.
  • Distinct neural networks underlie interhemispheric transmission and spatial attention, with specific areas identified for each function.