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Cortex controls multisensory depression in superior colliculus.

Wan Jiang1, Barry E Stein

  • 1Department of Neurobiology and Anatomy, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA. wjiang@wfubmc.edu

Journal of Neurophysiology
|October 10, 2003
PubMed
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Cortical influences regulate multisensory depression in superior colliculus (SC) neurons. Deactivating these cortical areas impairs multisensory integration, leading to heightened SC responses.

Area of Science:

  • Neuroscience
  • Sensory integration

Background:

  • Multisensory depression in superior colliculus (SC) neurons is a key indicator of multisensory integration.
  • This process occurs when an auditory stimulus outside a neuron's receptive field suppresses its response to a visual stimulus within the receptive field.

Purpose of the Study:

  • To investigate the role of specific cortical areas in modulating multisensory depression within the SC.
  • To understand how cortical deactivation affects the integration of visual and auditory stimuli in SC neurons.

Main Methods:

  • Experiments involved deactivating specific cortical areas, namely the anterior ectosylvian and rostral lateral suprasylvian sulci.
  • The study monitored the responses of SC neurons to visual and auditory stimuli before and after cortical deactivation.

Related Experiment Videos

Main Results:

  • Deactivation of these cortical areas significantly compromised the ability of SC neurons to exhibit multisensory depression.
  • SC neurons showed disinhibited and more vigorous responses, sometimes equaling responses to visual stimuli alone, when cortical influences were removed.
  • This suggests that cortical areas normally regulate or suppress SC responses during multisensory integration.

Conclusions:

  • Cortical influences from the anterior ectosylvian and rostral lateral suprasylvian sulci are crucial for normal multisensory depression in the SC.
  • The loss of these cortical influences leads to enhanced, less integrated multisensory responses in the SC.
  • These findings may explain how behavioral adaptations, such as visual orientation, can occur despite conflicting sensory information.