Stress Degrades Prefrontal Cortex Neuronal Coding of Goal-Directed Behavior

Area of Science:

• Neuroscience
• Cognitive Science
• Psychology

Background:

• Stress negatively impacts cognitive functions, particularly those reliant on the prefrontal cortex (PFC).
• Understanding the neurophysiological mechanisms of stress-induced cognitive impairment is crucial for addressing associated psychopathologies and workplace accidents.

Purpose of the Study:

• To investigate the effects of stress on the neural coding of working memory within the medial prefrontal cortex (mPFC) in a rat model.
• To elucidate how stress alters neuronal activity and multidimensional coding in the PFC during cognitive tasks.

Main Methods:

• Utilized a working memory task in rats to assess the impact of stress on neuronal activity.
• Recorded and analyzed the responses of medial prefrontal cortex (mPFC) neurons during task performance under stressed conditions.

Main Results:

• Stress significantly suppressed the activity of mPFC neurons that were strongly tuned to task events (e.g., delay, reward, error).
• Stress-induced impairments in task-related neuronal activity, including multidimensional coding, were predictive of cognitive deficits.
• Conversely, stress increased task-related activity in the larger population of weakly tuned mPFC neurons.

Conclusions:

• Stress causes a substantial collapse of neural representations across the broader PFC neuronal population.
• These findings highlight the detrimental and complex effects of stress on prefrontal cortex function and cognitive performance.