Social cognition in premotor and parietal cortex
Naotaka Fujii1, Sayaka Hihara, Atsushi Iriki
1RIKEN Brain Science Institute, Wako, Saitama, Japan. na@brain.riken.jp
Social Neuroscience
|September 17, 2008
Summary
The brain constantly monitors social environments to guide behavior. This study reveals how ventral premotor cortex and parietal cortex neurons in monkeys process self and other actions, differentiating agent and action recognition.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Social Cognition
Background:
- Socially appropriate behavior necessitates continuous environmental monitoring.
- Understanding the neural basis of action perception, especially at the single-cell level, is crucial but remains limited.
- The brain updates its representation of social context by observing others' actions.
Purpose of the Study:
- To investigate the single-cell activity in the ventral premotor cortex (PM) and parietal cortex during action observation and execution.
- To quantitatively characterize the neural systems involved in perceiving actions of self and others.
- To explore the roles of PM and parietal neurons in action cognition and social interaction.
Main Methods:
- Multidimensional recording of neuronal activity in monkeys.
- Simultaneous recording from ventral premotor cortex (PM) and parietal cortex.
- Utilizing a food grab task to elicit self and other action observation.
Main Results:
- Motion-related (MR) responses were observed in 35% of PM neurons and 54% of parietal neurons.
- Both areas showed lateralized preference for Self-Right actions.
- PM-MR neurons exhibited right-arm preference for both self and other actions, while parietal-MR neurons did not show arm preference for other actions.
- A significantly larger proportion of PM-MR neurons discriminated between self and other actions compared to parietal-MR neurons.
Conclusions:
- Ventral premotor cortex (PM) neurons contribute action primitives, including agent and effector information, within the mirror neuron system.
- Parietal neurons represent social space and aid in recognizing others' actions relative to one's own within the parieto-prefrontal network.
- These findings elucidate the distinct roles of PM and parietal cortices in action cognition and social perception.
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