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.
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.
Authors: Kai J Miller; Gerwin Schalk; Eberhard E Fetz; Marcel den Nijs; Jeffrey G Ojemann; Rajesh P N Rao Journal: Proc Natl Acad Sci U S A Date: 2010-02-16 Impact factor: 11.205
Authors: Peter C Poortvliet; Kylie J Tucker; Simon Finnigan; Dion Scott; Paul Sowman; Paul W Hodges Journal: Exp Brain Res Date: 2015-08-21 Impact factor: 1.972
Authors: Karim Jerbi; Jean-Philippe Lachaux; Karim N'Diaye; Dimitrios Pantazis; Richard M Leahy; Line Garnero; Sylvain Baillet Journal: Proc Natl Acad Sci U S A Date: 2007-04-18 Impact factor: 11.205
Authors: Vernon L Towle; Hyun-Ah Yoon; Michael Castelle; J Christopher Edgar; Nadia M Biassou; David M Frim; Jean-Paul Spire; Michael H Kohrman Journal: Brain Date: 2008-07-11 Impact factor: 13.501
Authors: Daryl R Kipke; William Shain; György Buzsáki; E Fetz; Jaimie M Henderson; Jamille F Hetke; Gerwin Schalk Journal: J Neurosci Date: 2008-11-12 Impact factor: 6.167