Neural mechanisms for learning self and other ownership

Area of Science:

• Cognitive Neuroscience
• Social Neuroscience

Background:

• Sense of ownership is fundamental to human cognition.
• Understanding the neural basis of ownership is crucial for explaining social interactions.

Purpose of the Study:

• To investigate the behavioral and neural mechanisms of ownership acquisition for self, friends, and strangers.
• To identify brain regions involved in tracking self-ownership versus ownership of others.

Main Methods:

• Model-based functional magnetic resonance imaging (fMRI).
• A novel minimal ownership paradigm.
• Analysis of behavioral data including preferences, reaction times, and learning rates.

Main Results:

• A consistent self-ownership bias was observed in behavior, affecting preferences, reaction times, and learning rates.
• Ventromedial prefrontal cortex (vmPFC) and anterior cingulate sulcus (ACCs) showed increased response to self-associations over stranger associations.
• No single brain area exclusively tracked self-ownership, but the anterior cingulate gyrus (ACCg) specifically encoded ownership prediction errors for strangers and associative strength for friends/strangers, not self.

Conclusions:

• Core neural mechanisms for associative learning are biased towards self-reference but also engage when learning about others.
• The anterior cingulate gyrus (ACCg) demonstrates specialization in learning about others, distinct from self-referential processing.