Intentionally not imitating: Insula cortex engaged for top-down control of action mirroring

Area of Science:

• Neuroscience
• Cognitive Science
• Motor Control

Background:

• Perception and action are linked via mirror neurons, facilitating action understanding.
• However, not all observed actions require imitation; intentional non-imitation is crucial for social interaction.

Purpose of the Study:

• To investigate the neural processes underlying intentional imitation versus counter-imitation.
• To differentiate between intentional non-imitation and incidental action processing.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to observe brain activity.
• Participants performed tasks involving intentional imitation, counter-imitation, incidental imitation, and incidental counter-imitation.

Main Results:

• Distinct cortical networks differentiate imitation from counter-imitation.
• Counter-imitation recruits frontal-parietal networks, including the insula and cingulate cortices.
• Task-relevance modulates sensorimotor mirroring through control processes.

Conclusions:

• Intentional counter-imitation involves preparatory suppression of imitative responses.
• The brain actively controls sensorimotor mirroring based on task demands.
• These findings are vital for understanding complex human interactions.