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Functional brain mapping of monkey tool use.

S Obayashi1, T Suhara, K Kawabe

  • 1Division of Advanced Technology for Medical Imaging, National Institute of Radiological Sciences, CREST (JST), Chiba 263-8555, Japan. ohbayash@nirs.go.jp

Neuroimage
|September 14, 2001
PubMed
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Tool use integrates objects into the brain's "body-image." Neuroimaging reveals increased brain activity in specific regions during tool use, crucial for updating this body-image.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Primate Research

Background:

  • Tool use leads to a psychological incorporation of the tool into the user's body schema.
  • Bimodal neurons in the intraparietal area of the monkey brain show altered visual response properties during tool use, incorporating the tool.

Purpose of the Study:

  • To investigate tool use-induced neural activation in the alert monkey brain using Positron Emission Tomography (PET).
  • To identify brain regions involved in maintaining and updating the body-image during tool manipulation.

Main Methods:

  • Utilized Positron Emission Tomography (PET) to measure cerebral blood flow changes in monkeys during tool use.
  • Compared brain activity during tool use with a control condition involving simple stick manipulation.

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Main Results:

  • Significant increases in cerebral blood flow were observed in the intraparietal region, basal ganglia, presupplementary motor area, premotor cortex, and cerebellum during tool use.
  • These activated areas are hypothesized to play a role in the dynamic updating of the body-image.

Conclusions:

  • Tool use engages specific neural networks involved in body-image representation and adaptation.
  • The findings suggest that the brain actively integrates tools into the body schema for effective interaction with the environment.