Increased gamma-range activity in human sensorimotor cortex during performance of visuomotor tasks. Aoki, F.; Fetz, E. E.; Shupe, L.; Lettich, E.; and Ojemann, G. A. Clin Neurophysiol, 110(3):524-37, 1999.
abstract   bibtex   
OBJECTIVE: We documented changes in spectral power of human electrocorticograms (ECoG) during performance of sensorimotor tasks. METHODS: In 6 human subjects, ECoGs were recorded simultaneously from 14 subdural cortical sites in forearm sensorimotor cortex. The subjects performed 3 visuomotor tasks: tracking a moving visual target with a joystick-controlled cursor, threading pieces of tubing, and pinching the fingers sequentially against the thumb. Control conditions consisted of passive resting and active extension of the wrist. For each site the spectral power of the ECoG during these behaviors was computed for 5 10 Hz ranges between 10 and 60 Hz. RESULTS: All subjects showed power decreases in the range of 11-20 Hz and power increases in the 31-60 Hz range during performance of the visuomotor tasks, at sites in forearm sensorimotor cortex and adjacent areas. Simple wrist movements often produced little change in power. Three subjects showed episodes of explicit gamma oscillations during the visuomotor tasks. Different sites showed increases in gamma-range power for different tasks, indicating that the spatial distribution of the gamma activity is specific to the tasks. Cross-spectra showed that gamma activity could become synchronized between separate sites during particular tasks. CONCLUSIONS: Synchronized gamma-range activity in human sensorimotor cortex increases with performance of manipulative visuomotor tasks, supporting the hypothesis that coherent gamma oscillations may play a role in sensorimotor integration or attention.
@article{ Aoki_etal99,
  author = {Aoki, F. and Fetz, E. E. and Shupe, L. and Lettich, E. and Ojemann,
	G. A.},
  title = {Increased gamma-range activity in human sensorimotor cortex during
	performance of visuomotor tasks},
  journal = {Clin Neurophysiol},
  year = {1999},
  volume = {110},
  pages = {524-37},
  number = {3},
  abstract = { OBJECTIVE: We documented changes in spectral power of human electrocorticograms
	(ECoG) during performance of sensorimotor tasks. METHODS: In 6 human
	subjects, ECoGs were recorded simultaneously from 14 subdural cortical
	sites in forearm sensorimotor cortex. The subjects performed 3 visuomotor
	tasks: tracking a moving visual target with a joystick-controlled
	cursor, threading pieces of tubing, and pinching the fingers sequentially
	against the thumb. Control conditions consisted of passive resting
	and active extension of the wrist. For each site the spectral power
	of the ECoG during these behaviors was computed for 5 10 Hz ranges
	between 10 and 60 Hz. RESULTS: All subjects showed power decreases
	in the range of 11-20 Hz and power increases in the 31-60 Hz range
	during performance of the visuomotor tasks, at sites in forearm sensorimotor
	cortex and adjacent areas. Simple wrist movements often produced
	little change in power. Three subjects showed episodes of explicit
	gamma oscillations during the visuomotor tasks. Different sites showed
	increases in gamma-range power for different tasks, indicating that
	the spatial distribution of the gamma activity is specific to the
	tasks. Cross-spectra showed that gamma activity could become synchronized
	between separate sites during particular tasks. CONCLUSIONS: Synchronized
	gamma-range activity in human sensorimotor cortex increases with
	performance of manipulative visuomotor tasks, supporting the hypothesis
	that coherent gamma oscillations may play a role in sensorimotor
	integration or attention.}
}
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