Exploring imitation of within hand prehensile object manipulation using fMRI and graph theory analysis
Werner Krammer1,2, John H Missimer3, Vanessa Vallesi4,5
1Support Centre for Advanced Neuroimaging (SCAN), Institute for Diagnostic and Interventional Neuroradiology, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland. krammer.wer@gmail.com.
Scientific Reports
|January 29, 2025
Summary
This study reveals how the brain processes imitation of hand movements during object manipulation. Brain imaging shows distinct networks for observing and performing actions, highlighting the left hemisphere for motor planning and the right for intentional imitation control.
Area of Science:
- Neuroscience
- Motor Control
- Cognitive Neuroscience
Background:
- Imitation of complex motor skills, particularly multi-finger haptic tasks during daily activities, is crucial for human interaction and learning.
- Understanding the neural underpinnings of imitation, especially the interplay between sensory-motor processes and cognitive control, remains an active area of research.
Purpose of the Study:
- To establish and investigate an imitation task involving multi-finger haptics during grasping and regrasping actions.
- To identify functional cerebral connectivity patterns associated with the observation and imitation of sensori-motor manipulation using functional magnetic resonance imaging (fMRI).
Main Methods:
- A video-guided imitation task involving fixation, observation, and imitation phases was performed by 26 healthy volunteers.
- fMRI was employed to record brain activity during the task.
- Graph analysis of fMRI data was used to map functional cerebral connectivity patterns.
Main Results:
- Functional connectivities indicated a motor plan for observation and manipulation in the left hemisphere.
- The right hemisphere network, including the inferior frontal gyrus, was involved in intentional imitation control.
- Both hemispheres showed 'rich clubs' (sensori-motor hand, attention, cingulo-opercular networks) for observation and execution.
- The left hand's manipulation and observation involved 'diversity clubs' with the dorsal visual association cortex, suggesting enhanced visual guidance.
Conclusions:
- The findings support the preferential involvement of ventral premotor cortices in the mirror network for imitation.
- Distinct hemispheric specializations and network structures are involved in the observation and imitation of complex hand actions.
- Enhanced visual processing is critical for guiding fine motor movements during imitation tasks.
