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Related Experiment Videos

Ipsilateral input modifies the primary somatosensory cortex response to contralateral skin flutter.

Mark Tommerdahl1, Stephen B Simons, Joannellyn S Chiu

  • 1Department of Biomedical Engineering, University of North Carolina, Chapel Hill, North Carolina 27599, USA. mark_tommerdahl@med.unc.edu

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|June 2, 2006
PubMed
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Squirrel monkey primary somatosensory cortex (SI) shows distinct responses to tactile flutter stimulation. Bilateral stimulation alters the SI activity pattern, suggesting a role in bimanual object exploration.

Area of Science:

  • Neuroscience
  • Somatosensory System
  • Neuroimaging

Background:

  • The primary somatosensory cortex (SI) processes tactile information.
  • Understanding how the brain integrates bilateral tactile input is crucial for explaining complex sensory experiences.

Purpose of the Study:

  • To investigate the optical intrinsic signal (OIS) response in squirrel monkey SI to unilateral and bilateral vibrotactile stimulation of the thenar eminence.
  • To characterize the spatiointensive patterns of SI activation during different stimulation conditions.

Main Methods:

  • Optical intrinsic signal imaging was used to record brain activity in the SI cortex of 5 squirrel monkeys.
  • 25 Hz vibrotactile flutter stimulation was applied to the thenar eminence, both unilaterally and bilaterally.

Related Experiment Videos

Main Results:

  • Ipsilateral stimulation evoked a smaller absorbance increase in SI compared to contralateral stimulation.
  • Bilateral stimulation resulted in a ~30% smaller absorbance increase than contralateral stimulation.
  • Bilateral flutter stimulation induced an inverse spatiointensive pattern in SI compared to contralateral stimulation (decreased central absorbance, increased surround absorbance).

Conclusions:

  • The unique SI activity pattern during bilateral flutter suggests a neural basis for perceptual experiences during bimanual tactile object exploration.
  • Ipsilateral somatosensory signals may reach SI via a two-stage pathway involving interhemispheric and intrahemispheric connections.