Related Experiment Videos
Deficit in motor cortical activity for simultaneous bimanual responses
Y Taniguchi1, B Burle, F Vidal
1Centre de Recherche en Neurosciences Cognitives, C.N.R.S.-C.R.N.C. 31 Chemin Joseph Aiguier, 13402 Marseilles, France.
Experimental Brain Research
|May 18, 2001
Summary
The bilateral deficit, where simultaneous bimanual responses are slower than unimanual ones, shows weaker sensorimotor activation during execution. This suggests interhemispheric inhibition may cause the slower reaction time (RT).
Area of Science:
- Neuroscience
- Motor Control
- Human Performance
Background:
- The bilateral deficit describes slower reaction times (RT) for simultaneous bimanual movements compared to unimanual ones.
- Understanding the neural mechanisms underlying this deficit is crucial for motor control research.
Purpose of the Study:
- To investigate the brain's electrical activity during the preparation and execution of unilateral and bilateral index finger flexion tasks.
- To identify electroencephalographic (EEG) correlates of the bilateral deficit.
Main Methods:
- Examined brain electrical activity using a source derivation method in 12 right-handed subjects.
- Utilized simple and choice reaction time (RT) tasks with unilateral and bilateral index finger flexion.
- Included 20% catch trials to ensure task engagement.
Main Results:
- A bilateral deficit in RT was observed for right-index finger movements.
- No EEG correlate of the bilateral deficit was found during the preparatory period.
- During execution, weaker sensorimotor area activation was observed for bilateral responses compared to unilateral ones, indicating an EEG correlate of the bilateral deficit.
Conclusions:
- The bilateral deficit is associated with reduced activation in the sensorimotor cortex during movement execution.
- Hypothesized causes include interhemispheric transmission constraints and persistent transcallosal inhibition during bilateral responses.