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The human brain, a complex organ, is functionally divided into two cerebral hemispheres—left and right. These hemispheres are interconnected by a structure of paramount importance, the corpus callosum. This substantial bundle of neural fibers is not just a bridge between the hemispheres but a crucial element for the brain's comprehensive functioning. It enables efficient communication between the two hemispheres, allowing each side of the brain to control and receive sensory and motor...
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A frontal transcallosal inhibition loop mediates interhemispheric balance in visuospatial processing.

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Systems Neuroscience

Background:

  • Interhemispheric communication via the corpus callosum is crucial for sensory and cognitive functions.
  • Impaired transcallosal inhibition is linked to visuospatial bias after frontoparietal damage, but underlying synaptic circuits are unclear.

Purpose of the Study:

  • To investigate the synaptic circuits mediating transcallosal inhibition and visuospatial bias after anterior cingulate area (ACA) lesions.
  • To explore the role of ACA callosal-projection neurons (CPNs) and parvalbumin-positive (PV+) neurons in interhemispheric balance.

Main Methods:

  • Utilized a visual-change-detection task in mice with anterior cingulate area (ACA) lesions.
  • Performed unilateral CPN inactivation and parvalbumin-positive (PV+) neuron activation/inactivation.
  • Analyzed behavioral changes and interhemispheric interactions.

Main Results:

  • ACA lesions induced visuospatial bias mediated by a transcallosal inhibition loop.
  • CPNs and contralateral PV+ neurons form an inhibitory loop, regulating interhemispheric communication.
  • Activating contralesional PV+ neurons restored interhemispheric balance and reversed lesion-induced visuospatial bias.

Conclusions:

  • A frontal transcallosal inhibition loop involving ACA CPNs and PV+ neurons is essential for visuospatial processing and interhemispheric balance.
  • Enhancing this inhibitory pathway can restore balance and correct visuospatial deficits caused by brain damage.