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Related Experiment Videos

Brain-behavior relationships: evidence from practice effects in spatial stimulus-response compatibility

M Iacoboni1, R P Woods, J C Mazziotta

  • 1Department of Neurology, Psychology, Pharmacology, and Radiological Sciences, Reed Neurological Research Center, UCLA School of Medicine 90095, USA.

Journal of Neurophysiology
|July 1, 1996
PubMed
Summary
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This study shows that the superior parietal lobules are involved in spatial stimulus-response compatibility. Increased blood flow in these areas during incompatible tasks suggests greater cognitive effort for remapping.

Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Spatial stimulus-response compatibility tasks are crucial for understanding sensorimotor integration.
  • Previous research has implicated various brain regions in these tasks, but the specific roles of the superior parietal lobules remain under investigation.

Purpose of the Study:

  • To investigate the neural correlates of spatial stimulus-response compatibility using positron emission tomography (PET).
  • To examine the effects of practice on brain activity during these tasks.

Main Methods:

  • Six healthy subjects underwent PET scans measuring relative cerebral blood flow (rCBF) with H(2) 15O.
  • Subjects performed a spatial stimulus-response compatibility task under compatible and incompatible conditions, with and without practice.

Related Experiment Videos

Main Results:

  • Reaction times were significantly slower in the incompatible condition compared to the compatible condition.
  • Increased rCBF was observed bilaterally in the superior parietal lobules during the incompatible condition.
  • Practice led to decreased reaction times and increased rCBF in the left dorsolateral prefrontal, premotor, and primary motor cortex.
  • Practice did not alter the spatial stimulus-response compatibility effect.

Conclusions:

  • The superior parietal lobules are critical for mapping spatial attributes of visual stimuli to motor responses.
  • Increased rCBF in the superior parietal lobules during incompatible conditions reflects the computational demands of spatial remapping.
  • Practice enhances sensorimotor processing through mechanisms involving the left prefrontal and motor cortices, suggesting left hemisphere superiority.