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Increased gamma-range activity in human sensorimotor cortex during performance of visuomotor tasks
1Department of Physiology and Biophysics, University of Washington, Seattle 98195, USA.
Summary
Human electrocorticograms (ECoG) reveal increased gamma-range activity during sensorimotor tasks. This synchronized gamma activity in the sensorimotor cortex may be crucial for motor control and attention.
Area of Science:
- Neuroscience
- Motor Control Research
Background:
- Electrocorticography (ECoG) provides high-resolution neural data.
- Sensorimotor cortex plays a key role in planning and executing movements.
Purpose of the Study:
- To investigate changes in spectral power of human ECoGs during sensorimotor tasks.
- To explore the role of gamma oscillations in visuomotor performance.
Main Methods:
- ECoGs recorded from 14 subdural cortical sites in 6 human subjects.
- Subjects performed visuomotor tasks (tracking, threading, pinching) and control tasks.
- Spectral power computed for ECoG in 10-60 Hz ranges.
Main Results:
- Power decreased in 11-20 Hz and increased in 31-60 Hz ranges during visuomotor tasks.
- Gamma oscillations (31-60 Hz) were observed in some subjects during tasks.
- Task-specific spatial distribution and synchronization of gamma activity were noted.
Conclusions:
- Synchronized gamma-range activity increases during manipulative visuomotor tasks.
- Coherent gamma oscillations may be involved in sensorimotor integration and attention.