Neural coding of cooperative vs. affective human interactions: 150 ms to code the action's purpose

Area of Science:

• Neuroscience
• Cognitive Psychology
• Social Cognition

Background:

• The mirror neuron system (MNS) is crucial for understanding actions and intentions.
• The precise timing and neural basis of extracting social interaction information remain unclear.

Purpose of the Study:

• To investigate the temporal dynamics and neural correlates of understanding cooperative versus affective social interactions.
• To explore the role of the MNS and other brain regions in discriminating action goals and intentions.

Main Methods:

• Event-Related Potentials (ERPs) were recorded from 35 university students viewing images of cooperative and affective interactions.
• Source localization using swLORETA identified brain regions involved in processing these interactions.
• Analysis focused on specific time windows (e.g., 150-170 ms, 200-250 ms) and gender differences.

Main Results:

• Action goals were discriminated around 150-170 ms (N170 response).
• Affective actions primarily engaged the right posterior cingulate cortex (CC), while cooperative actions involved the right superior temporal sulcus (pSTS).
• Women exhibited greater discriminative responses than men, with bilateral activation compared to left-sided in men.

Conclusions:

• Social interactions are discriminated based on intentions early in neural processing.
• Distinct neural pathways, including those involved in face/body/action coding, limbic system, and MNS, are differentially activated.
• Gender modulates the neural processing of social interaction discrimination, potentially linked to MNS responsiveness.