Single forebrain neurons represent interval timing and reward amount during response scheduling.

Area of Science:

• Neuroscience
• Cognitive Science
• Animal Behavior

Background:

• Climbing activity, a progressive rise in neural discharge rate, is hypothesized to be vital for interval timing.
• Previous research often linked climbing activity to passive time perception, not active motor timing.

Purpose of the Study:

• To investigate the role of climbing activity in active action timing.
• To explore the neural mechanisms underlying interval timing in a self-control task.

Main Methods:

• Pigeons were trained on a self-control task with rapid-response and wait trials.
• Single-cell recordings were performed in the Nidopallium caudolaterale (avian prefrontal cortex).
• Neural activity was analyzed in relation to response accuracy and reward magnitude.

Main Results:

• Neurons exhibited climbing activity during the cue-to-response interval, with flatter ramps in wait trials compared to rapid-response trials.
• Response errors (premature or tardy) correlated with steeper or flatter climbing activity, respectively.
• Climbing activity patterns were modulated by anticipated reward size, indicating integration of timing and motivational information.

Conclusions:

• Climbing activity is behaviorally and motivationally significant for prospective information encoding in action timing.
• This finding supports the role of climbing activity in active timing and decision-making.
• The study provides further evidence for functional similarities between the avian pallium and the mammalian cortex.