Transitions between Multiband Oscillatory Patterns Characterize Memory-Guided Perceptual Decisions in Prefrontal...

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Systems Neuroscience

Background:

• Neuronal activity in the lateral prefrontal cortex (LPFC) is crucial for memory-guided sensory discrimination tasks.
• Understanding how network states articulate during perception, memory, and comparison remains a challenge.
• Local field potential (LFP) oscillations offer insights into neural network dynamics.

Purpose of the Study:

• To investigate LFP oscillations in the LPFC during a memory-guided sensory comparison task in macaques.
• To determine how different LFP frequency bands (theta, beta, gamma) relate to distinct task components: perception, memory, and decision-making.

Main Methods:

• Recorded LFPs from the LPFC of macaques performing a task involving comparing visual motion patterns (S1 and S2) with a delay.
• Analyzed LFP power modulations in theta, beta, and gamma bands across task stages: stimulus presentation, delay, and comparison.

Main Results:

• LFP theta and gamma power increased, while beta power decreased, in response to motion stimuli.
• Beta power modulation during the delay phase suggested memory maintenance of the first stimulus (S1).
• Broadband LFP activity after the second stimulus (S2) onset reflected the difference between S1 and S2, with distinct sensory and choice-related components.

Conclusions:

• Individual LFP bands dynamically track distinct sensory and cognitive processes during different task stages.
• Prefrontal network transitions between states, characterized by a conjunction of LFP rhythms, support complex cognitive tasks.
• This suggests coordinated network dynamics rather than isolated frequency band activity underlie cognitive computations.