Action-dependent processing of self-motion in parietal cortex of macaque monkeys

Area of Science:

• Neuroscience
• Sensory Processing
• Primate Cognition

Background:

• Distinguishing self-generated from external sensory input is crucial for environmental interaction.
• Temporal proximity between an action and its sensory consequence often indicates self-agency.

Purpose of the Study:

• To investigate how delays between action and simulated self-motion affect neural processing in the ventral intraparietal area (VIP) of macaque monkeys.
• To understand the role of the sense of agency in processing self-motion stimuli.

Main Methods:

• Electrophysiological recordings were performed on macaque monkeys.
• The study examined neural responses in the VIP to visually simulated self-motion.
• Varying delays were introduced between a touch bar press (action) and the onset of simulated self-motion (effect).

Main Results:

• A subpopulation of VIP neurons (21%) showed increased activity before motion onset when there was a delay between action and effect.
• Sustained neural activity during self-motion was significantly lower when action and motion were contiguous compared to when motion was delayed.
• These findings suggest that the sense of agency modulates neural responses to self-motion stimuli.

Conclusions:

• Area VIP plays a role in differentiating self-induced from externally induced sensory stimulation related to self-motion.
• The observed neural modulation may enhance the precision of heading information, crucial for navigation.
• VIP neurons are well-suited for studying the integration of active behavior and sensory processing during self-motion.