Decoding a Decision Process in the Neuronal Population of Dorsal Premotor Cortex

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Primate Studies

Background:

• The dorsal premotor cortex (DPC) exhibits complex neuronal responses during tasks involving temporal discrimination of stimuli.
• Previous studies noted heterogeneity in DPC neuronal activity, coding stimulus patterns broadly and signaling during various cognitive periods.

Purpose of the Study:

• To elucidate the underlying coding structure within the heterogeneous DPC population activity.
• To identify specific neural components representing temporal information and task parameters in the DPC.

Main Methods:

• Analysis of neuronal population activity in the dorsal premotor cortex of trained monkeys performing a sequential vibrotactile discrimination task.
• Dimensionality reduction techniques to identify major coding components within DPC neuronal responses.
• Comparison of neural signals during task performance, a cognitive control task, and error trials.

Main Results:

• DPC population activity was condensed into two primary coding components.
• One component persistently encoded the first stimulus identity and the informed choice, while the other transiently coded sensory input and comparison outcomes.
• Distinct signals for task event timing were identified and linked to behavioral performance.
• These signals were more prominent during the demanding task compared to control conditions and error trials.

Conclusions:

• The heterogeneous DPC neuronal responses can be organized into distinct functional components representing working memory, sensory processing, and decision-making.
• These identified neural signals are crucial for linking temporal information processing and task-specific behavior.
• The DPC plays a significant role in integrating sensory information and guiding behavioral choices based on temporal structures.