Related Experiment Videos
Enhanced brain activity preceding voluntary movement in early blind humans
A Lehtokoski1, T Kujala, R Näätänen
1Department of Psychology, University of Helsinki, Finland. anne.lehtokoski@helsinki.fi
Neuroscience Letters
|October 29, 1998
Summary
Blindness alters brain activity related to movement. Blind individuals exhibit larger movement-related potentials (MRPs) and readiness potentials (RPs) compared to sighted individuals, suggesting functional brain changes.
Area of Science:
- Neuroscience
- Sensory processing
- Motor control
Background:
- Blindness, particularly early-onset, may lead to functional reorganization in the brain.
- Movement-related potentials (MRPs) are electrical signals in the brain preceding voluntary movement.
Purpose of the Study:
- To investigate the effects of early-onset blindness on movement-related brain activity.
- To compare movement-related potentials (MRPs) in blind and sighted young adults.
Main Methods:
- Measured scalp electroencephalography (EEG) to record movement-related potentials (MRPs).
- Analyzed the negative slope (NS') of MRPs and the readiness potential (RP) in response to self-paced button presses.
- Compared data between young adults with early-onset blindness and sighted controls.
Main Results:
- Blind subjects showed larger negative slope (NS') of MRPs and readiness potentials (RPs) compared to sighted subjects.
- The scalp distribution of these potentials was similar between the two groups.
- These differences emerged approximately 400 ms prior to movement execution.
Conclusions:
- Early-onset blindness is associated with altered brain activity during movement preparation.
- Functional changes are suggested in cortical areas responsible for motor preparation and initiation in blind individuals.
- The brain may compensate for visual loss through modifications in motor-related neural processing.