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Updated: Apr 27, 2026
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Corticospinal Excitability Modulation During Action Observation
Published on: December 31, 2013
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Involvement of the superior temporal cortex in action execution and action observation
Marina Kilintari1, Vassilis Raos1, Helen E Savaki2
1Institute of Applied and Computational Mathematics, Foundation for Research and Technology Hellas, 70013, Greece, and Department of Basic Sciences, Faculty of Medicine, School of Health Sciences, University of Crete, 71003, Greece.
Summary
Observing others
Area of Science:
- Neuroscience
- Cognitive Neuroscience
- Primate Brain Research
Background:
- The precise function of the superior temporal sulcus (STS) in action processing is not fully understood.
- Previous research has yielded conflicting results regarding the STS's role in action execution versus observation.
- Investigating STS activity during complex motor tasks is crucial for understanding its contribution to action representation.
Purpose of the Study:
- To elucidate the role of the superior temporal sulcus (STS) in action execution and observation.
- To differentiate brain activity associated with goal-directed actions versus simple motor movements.
- To explore the neural mechanisms underlying the retrieval of visual action representations.
Main Methods:
- Utilized quantitative (14)C-deoxyglucose autoradiography in monkeys to measure regional cerebral metabolic activity.
- Assessed brain responses during three conditions: reaching-to-grasp in light, reaching-to-grasp in darkness, and observation of reaching-to-grasp.
- Included fixation and arm-motion controls to isolate specific neural activations.
Main Results:
- Observation of reaching-to-grasp activated superior temporal polysensory area (STP) and the motion complex (including MST, FST, MTd, MTv), with greater emphasis on goal-directed aspects.
- Execution of reaching-to-grasp in light primarily activated area TS2 and middle temporal area (MT), suggesting MT's role in arm motion rather than purposeful action.
- Reaching-to-grasp in darkness engaged all components of the motion complex, indicating its involvement in action execution without visual feedback.
Conclusions:
- Lack of visual feedback during action execution recruits the motion complex.
- Observation of actions by others engages the superior temporal polysensory area (STP) and the motion complex.
- Findings suggest an integration of sensory and motor information in action codes, with visual representations retrieved during action observation or execution in darkness.
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