Correlated discharges in the primate prefrontal cortex before and after working memory training

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Systems Neuroscience

Background:

• Neuronal discharge correlations offer insights into neural computations and network properties during cognitive tasks.
• Attention dynamically modulates neuronal correlations, but the impact of task learning itself is less understood.

Purpose of the Study:

• To quantify correlated firing in prefrontal cortex neuron pairs in monkeys before and after learning a working memory task.
• To investigate how task learning alters the correlation structure of neuronal activity.

Main Methods:

• Simultaneous recording of neuronal pairs in the prefrontal cortex of monkeys.
• Analysis of trial-to-trial discharge rate correlations (noise correlation) before and after working memory task training.

Main Results:

• Pre-training, noise correlations varied based on neuronal responsiveness and stimulus selectivity.
• Post-training, overall correlated firing decreased, with variations based on neuronal functional properties.
• Greatest decreases in noise correlation were seen in specific neuron populations and interneuron-pyramidal neuron pairs.

Conclusions:

• Learning and performing a cognitive task significantly alters the correlation structure of neuronal firing in the prefrontal cortex.
• Task-related learning reshapes neural network communication, influencing cognitive processing.