This research was supported by Royal Society of NZ Marsden Fund Grant UOA 813. We thank Branka Milivojevic for assistance with the recordings and preparation of figures.
Changes in rolandic mu rhythm during observation of a precision grip
Article first published online: 7 NOV 2003
Volume 41, Issue 1, pages 152–156, January 2004
How to Cite
Muthukumaraswamy, S.D. and Johnson, B.W. (2004), Changes in rolandic mu rhythm during observation of a precision grip. Psychophysiology, 41: 152–156. doi: 10.1046/j.1469-8986.2003.00129.x
- Issue published online: 7 NOV 2003
- Article first published online: 7 NOV 2003
- (Received March 14, 2003; Accepted July 27, 2003)
- Action recognition;
- Mirror neurons;
- Mu rhythm;
- Sensorimotor cortex
We recorded 128-channel EEG from 16 participants while they observed, imitated, and self-initiated the precision grip of a manipulandum. Mu rhythm amplitudes were significantly lower during observation of a precision grip than during observation of a simple hand extension without object interaction. Scalp topographies for subtractions of observation, imitation, and execution conditions from the control condition showed a high degree of congruence, supporting the notion of a human observation–execution matching system. Surface Laplacian transformations suggest that the decrease in mu amplitude during precision grip observation reflects desynchronization of mu rhythm generators in the sensorimotor cortex. These results support the hypothesis that sensorimotor cortex is a neural substrate involved in the representation of both self- and other-generated actions and show the mu rhythm is sensitive to subtle changes in observed motor behavior.