Reshaping sensory representations by task-specific brain states: Toward cortical circuit mechanisms

Area of Science:

• Neuroscience
• Cognitive Science
• Computational Neuroscience

Background:

• Perception integrates internal brain states with external sensory information.
• Top-down modulation of sensory representations is crucial for perception.
• Previous research highlighted task-dependent modulations in sensory cortex.

Purpose of the Study:

• To review recent progress in understanding the circuit-level mechanisms of top-down modulation in perception.
• To elucidate how top-down signals influence sensory processing and behavior.
• To explore the computational roles of these feedback pathways.

Main Methods:

• Review of recent neuroscientific studies.
• Analysis of circuit-level mechanisms.
• Examination of feedback pathways from association cortices to sensory cortices.

Main Results:

• Top-down signals encode diverse task-related information (e.g., engagement, knowledge, decision execution).
• These signals are transmitted via feedback pathways from association cortices.
• Interaction between top-down signals and sensory circuits supports complex computations.

Conclusions:

• Top-down modulation is a key mechanism for constructing dynamic percepts.
• These mechanisms support predictive coding and inference-making.
• Understanding these circuits enhances our knowledge of behavioral flexibility.