Distinct tasks engage a shared neural subspace in human hippocampus and anterior cingulate cortex.

Area of Science:

• Neuroscience
• Cognitive Science
• Computational Neuroscience

Background:

• Human cognitive flexibility allows performing diverse, unrelated tasks.
• Understanding how neural circuits support multiple tasks is crucial.
• Neural representations may be task-specific or share structures across behaviors.

Purpose of the Study:

• Investigate whether neural representations are task-specific or shared across distinct behaviors.
• Examine neural population activity in the hippocampus and anterior cingulate cortex during multiple tasks.
• Compare the geometry of task-related neural subspaces.

Main Methods:

• Recorded neural population activity from the hippocampus and anterior cingulate cortex in human patients.
• Patients performed three distinct tasks.
• Utilized dimensionality reduction to estimate and compare task-related neural subspaces.

Main Results:

• Task-related neural subspaces were not independent across tasks.
• Approximately half of the subspace dimensions were shared across tasks.
• Shared dimensions primarily contained the majority of shared neural covariance.

Conclusions:

• Neural population activity in the hippocampus and anterior cingulate cortex is not purely task-specific.
• A stable, low-dimensional circuit structure may persist across unrelated behaviors.
• This shared structure could provide a common substrate for flexible cognition.