Do brain oscillations of different frequencies indicate interaction between cortical areas in humans?

Oscillatory cortical activity in the beta frequency range (14-32 Hz) was in vestigated in a voluntary movement task using closely-spaced electroencepha logram recordings over the sensorimotor cortex. According to recent studies , short-lasting beta oscillations were observed within the first second aft er termination of a self-paced finger movement. In this study we show, more over, that finger movement creates beta bursts not only overlying the hand representation area, but also, at a higher frequency, over neighboring cort ical areas representing the foot. The results indicate that, related to the same event, distinct cortical areas can display increased synchronized act ivity at different frequencies, providing evidence for interaction between the corresponding neuronal networks. (C) 2000 Elsevier Science Ireland Ltd. All rights reserved.