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Related Experiment Videos

Visuomotor transformations for reaching to memorized targets: a PET study

F Lacquaniti1, D Perani, E Guigon

  • 1INB-CNR, University of Milan, Scientific Institute H. S. Raffaele, Italy.

Neuroimage
|February 1, 1997
PubMed
Summary

Positron emission tomography (PET) revealed distinct brain networks for immediate and delayed reaching tasks. Immediate pointing activated visuospatial working memory areas, while delayed pointing engaged networks for spatial attention and memory encoding.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Neuroimaging

Background:

  • Understanding the neural basis of visually guided reaching is crucial for cognitive neuroscience.
  • Previous studies have implicated various cortical and subcortical regions in motor control.
  • Differentiating the neural processes underlying immediate versus delayed motor responses remains an area of active research.

Purpose of the Study:

  • To identify specific cortical and subcortical brain regions involved in the control of reaching to visual targets.
  • To compare the neural activation patterns associated with immediate visually guided reaching versus reaching to a previously seen target.
  • To elucidate the distinct cognitive processes mediated by different brain networks during these motor tasks.

Main Methods:

Related Experiment Videos

  • Utilized H2(15)O Positron Emission Tomography (PET) to measure regional cerebral blood flow (rCBF) in eight healthy subjects.
  • Subjects performed three tasks: visual detection, immediate pointing to a visual target, and delayed pointing to a previous visual target.
  • Analyzed PET data using analysis of covariance and t statistics to identify significant rCBF increases.

    • Main Results:

    • Both immediate and delayed pointing tasks showed increased rCBF in the contralateral primary sensorimotor cortex, ventrolateral precentral gyrus, inferior frontal gyrus, supramarginal gyrus, middle occipital gyrus, and cerebellar vermis compared to visual detection.
    • Immediate pointing additionally activated the left inferior parietal lobule (near the intraparietal sulcus) and bilateral dorsolateral prefrontal cortex.
    • Delayed pointing showed additional activation in the supplementary motor cortex, anterior/midcingulate cortex, left inferior occipital gyrus, right superior parietal lobule, right supramarginal gyrus, right posterior hippocampus, bilateral lingual gyri, bilateral cerebellar hemispheres, anterior thalamus, and pulvinar.

    Conclusions:

    • Distinct cerebral networks are activated for immediate versus delayed visually guided reaching, reflecting different cognitive demands.
    • The intraparietal sulcus and prefrontal cortex activation in immediate pointing supports their role in visuospatial working memory.
    • The corticolimbic network activation in delayed pointing suggests its involvement in spatial attention and the complex memory processes required for sequential spatial information.