Verbally specified task goals reorganize visual codes in human ventral temporal cortex via medial frontal modulation

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Computational Neuroscience

Background:

• Understanding how higher cortical regions modulate sensory representations for cognitive flexibility is crucial.
• The role of the ventral temporal cortex (VTC) in context-dependent coding is not well-established.

Purpose of the Study:

• To investigate how instruction timing dynamically reconfigures sensory representations in the human brain.
• To explore the interplay between medial frontal cortex, VTC, and cognitive control.

Main Methods:

• Simultaneous single-neuron recordings across multiple human brain regions, including VTC, dorsal anterior cingulate cortex (dACC), and hippocampus.
• Analysis of neuronal responses to visual stimuli contingent on instruction timing.

Main Results:

• Ventral temporal cortex (VTC) representations were dynamically reconfigured by instruction timing, sharpening categorical representations when goals were specified.
• Dorsal anterior cingulate cortex (dACC) and hippocampus showed strong signals related to instruction timing.
• Increased coupling between dACC and VTC correlated with task uncertainty, cognitive demand, and predicted performance.

Conclusions:

• A dynamic feedback mechanism exists where medial frontal cortex reorganizes VTC sensory population codes.
• This cortical coordination is essential for flexible, goal-directed computation and cognitive flexibility.