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Published on: August 1, 2018
Anterior intraparietal cortex codes complexity of observed hand movements
Laura Biagi1, Giovanni Cioni, Leonardo Fogassi
1Stella Maris Scientific Institute, Via dei Giacinti, 2 I-56128 Calambrone, Pisa, Italy.
Brain Research Bulletin
|December 17, 2009
Summary
The anterior intraparietal area (AIP) processes complex hand actions. Observing intricate object manipulation activates AIP more than simple grasping, suggesting a role in understanding action complexity.
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Motor Control
Background:
- The anterior intraparietal area (AIP) is vital for visuomotor transformations related to hand actions.
- Human AIP is involved in the mirror system, activating during observed hand actions.
Purpose of the Study:
- To investigate if AIP activation reflects the complexity of observed hand actions.
- To compare AIP responses to complex versus simple object-manipulation tasks.
Main Methods:
- Functional magnetic resonance imaging (fMRI) was used to study human AIP activation.
- Participants observed complex (e.g., key insertion) and simple (e.g., grasping) hand tasks from a first-person perspective.
Main Results:
- Both complex and simple tasks activated the fronto-parietal mirror system.
- AIP showed higher activation when observing contralateral hand actions (hand identity effect).
- AIP was more active during observation of complex tasks compared to simple tasks, especially for the contralateral hand in the right AIP.
Conclusions:
- AIP's heightened response to complex actions supports the direct-matching hypothesis.
- Observation of motor acts engages the observer's motor system, reflecting action complexity.
- This complexity-related property is specific to AIP within the observed fronto-parietal network.
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