Attentional Changes in Either Criterion or Sensitivity Are Associated with Robust Modulations in Lateral Prefrontal...

Area of Science:

• Neuroscience
• Cognitive Science
• Primate Models

Background:

• Visual attention involves widespread neuronal changes, often assumed to stem from a single attentional mechanism.
• Signal detection theory allows partitioning attention effects into changes in criterion or sensitivity.
• Previous studies linked visual cortex neuronal changes solely to sensitivity, leaving the neural basis of criterion changes unclear.

Purpose of the Study:

• To investigate which brain structures mediate attention-related changes in behavioral criterion.
• To determine if individual neurons in higher-order areas are involved in multiple components of attention.
• To compare neuronal modulations in the lateral prefrontal cortex (LPFC) with those in the visual cortex regarding attention.

Main Methods:

• Electrophysiological recordings from the lateral prefrontal cortex (LPFC) of monkeys.
• Analysis of neuronal firing rates, pairwise correlations, and Fano factors.
• Correlating neuronal activity changes with behavioral shifts in criterion and sensitivity during a visual attention task.

Main Results:

• Unlike visual cortex neurons, LPFC neurons exhibited modulations in firing rates, pairwise correlations, and Fano factors for both criterion and sensitivity changes.
• These findings demonstrate that LPFC neurons are sensitive to distinct behavioral components of attention.
• Neuronal activity in LPFC is not a monolithic signal but reflects separable aspects of attentional control.

Conclusions:

• Attention-related neuronal modulations differ across brain regions, with LPFC neurons reflecting both criterion and sensitivity changes.
• This suggests that distinct neural circuits may underlie different components of visual attention.
• Individual neurons in LPFC can participate in multiple aspects of attentional processing.