[Interaction between symmetrical cortical dominants formed during simultaneous bilateral polarization]

Area of Science:

• Neuroscience
• Cortical electrophysiology
• Comparative neurology

Context:

• Investigating interhemispheric interactions in the feline visual cortex.
• Examining the dynamics of neural activity during simultaneous bilateral polarization of the parastriate cortex (areas 18 and 17).

Purpose:

• To elucidate the mechanisms underlying hemisphere dominance and interhemispheric communication.
• To analyze the nature of interactions between dominant cortical sites during polarization.

Summary:

• Bilateral simultaneous polarization of the cat's parastriate cortex induced two dominant sites with reciprocal summation interactions.
• Initially, callosal and extracallosal influences supported interhemispheric relations. A 'fight' between dominants disrupted extracallosal mechanisms while callosal pathways persisted.
• Hemispheric asymmetry in cortical layers influenced dominance, with the left hemisphere ultimately suppressing the right.

Impact:

• Highlights the role of functional interhemispheric asymmetry in establishing hemisphere dominance.
• Provides insights into the dynamic interplay of callosal and extracallosal pathways during neural competition.
• Demonstrates how hemispheric specialization emerges from competitive interactions within cortical networks.