Attentional selection and action selection in the ventral and orbital prefrontal cortex

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Primate Behavior

Background:

• The ventral and orbital prefrontal cortex (PFv+o) is implicated in both learning conditional rules for action selection and attentional selection of stimuli.
• It remains debated whether PFv+o's role in action selection stems from its attentional functions or vice versa.

Purpose of the Study:

• To investigate the role of the ventral and orbital prefrontal cortex (PFv+o) in conditional action selection.
• To determine if PFv+o's function in action selection is dependent on attentional demands or stimulus selection difficulty.

Main Methods:

• Five macaques were trained on a conditional action-selection task with varied stimulus selection difficulty (spatial separation, distractors).
• Bilateral PFv+o lesions were performed to assess effects on performance.
• Behavioral responses and accuracy were analyzed under different task conditions.

Main Results:

• PFv+o lesions impaired conditional action selection, even with minimal attentional demands.
• The impairment in action selection was exacerbated by increased stimulus selection difficulty.
• Performance was significantly worse when identifying the behaviorally relevant stimulus was made difficult.

Conclusions:

• The ventral and orbital prefrontal cortex (PFv+o) is central to using conditional rules for action selection.
• While other regions (premotor, striatal) also represent conditional rules, PFv+o may have a specialized role in the initial selection of behaviorally relevant stimuli.