Stimulus selectivity in dorsal and ventral prefrontal cortex after training in working memory tasks

Area of Science:

• Neuroscience
• Cognitive Psychology
• Primate Behavior

Background:

• The prefrontal cortex (PFC) is crucial for working memory.
• Debate exists on whether PFC regions are innately specialized or shaped by training for specific information types.

Purpose of the Study:

• To investigate the innate specialization versus task-dependent shaping of dorsal and ventral lateral prefrontal cortex (LPFC) in visual working memory.

Main Methods:

• Neuronal recordings from dorsal and ventral LPFC in monkeys.
• Tasks involved visual working memory before and during training.

Main Results:

• Before training, dorsal LPFC showed higher visual responsiveness and spatial selectivity.
• After training, spatial selectivity remained higher in dorsal LPFC, while ventral LPFC showed greater task-dependent changes.
• Ventral LPFC was more influenced by task demands in activation and selectivity.

Conclusions:

• Primate prefrontal cortex exhibits regional specialization for stimulus selectivity independent of training.
• Dorsal LPFC is inherently biased for spatial information representation.
• Ventral LPFC is biased for nonspatial information but is more adaptable to task demands.