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Mapping functional activity in rodent cortex using optical intrinsic signals

S M Narayan1, E M Santori, A W Toga

  • 1Department of Neurology, UCLA School of Medicine 90024.

Cerebral Cortex (New York, N.Y. : 1991)
|March 1, 1994
PubMed
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This study reveals how the rodent posteromedial barrel subfield cortex dynamically responds to whisker deflection using optical imaging. It highlights metabolic changes and microvascular recruitment occurring within seconds of stimulation.

Area of Science:

  • Neuroscience
  • Optical Imaging
  • Somatosensory System

Background:

  • Electrophysiologic responses in the barrel cortex are well-documented.
  • Dynamic metabolic changes and their relation to perfusion or oxidative enzymes in this region remain less understood.

Purpose of the Study:

  • To investigate the dynamic response of the rodent posteromedial barrel subfield (PMBSF) cortex to mechanical whisker deflection.
  • To understand metabolic changes affecting activity-related perfusion and oxidative enzymes using optical intrinsic signal imaging.

Main Methods:

  • Anesthetized male Sprague-Dawley rats were used.
  • Mechanical deflection of single and multiple vibrissae was performed.
  • Optical intrinsic signal imaging was employed to acquire images of the somatosensory cortex.

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Main Results:

  • Stimulus-related reflectance decreases were observed in the PMBSF, indicating two distinct spatiotemporal components.
  • A diffuse component appeared 0.5-1 sec post-stimulus, peaking at 2.5-3 sec.
  • A macrovascular component began at 1-1.5 sec, peaking at 3 sec, with both dissipating within 6 seconds.

Conclusions:

  • Optical reflectance methods successfully demonstrated PMBSF response to vibrissal deflection.
  • Intrinsic signals correspond spatially with maximal electrophysiologic responses.
  • These signals likely reflect activity-related microvascular recruitment and chromophore redox changes within seconds of stimulus onset.