The Neural and Computational Architecture of Feedback Dynamics in Mouse Cortex during Stimulus Report

Area of Science:

• Neuroscience
• Cognitive Science
• Computational Neuroscience

Background:

• Conscious reportability of visual input shows a bimodal neural response in the primary visual cortex (V1).
• A late-latency response, crucial for consciousness theories, is believed to be driven by the prefrontal cortex (PFC).

Purpose of the Study:

• To investigate the neural mechanisms underlying conscious reportability.
• To determine the roles of V1, PPC, and PFC in generating late-latency neural activity related to stimulus detection.

Main Methods:

• Analysis of electrophysiological data from mice performing stimulus detection tasks.
• Development of a minimal network model constrained by known cortical connectivity.

Main Results:

• PFC is necessary for report-related activity in V1, but only via PPC mediation.
• PPC, not PFC, holds the final control over enabling the late V1 activity wave associated with conscious report.

Conclusions:

• The posterior parietal cortex plays a critical role in conscious visual awareness, acting as a crucial mediator between PFC input and V1 output.
• Current theories on PFC's role in consciousness may need revision to incorporate the significant influence of PPC.