Actor's and observer's primary motor cortices stabilize similarly after seen or heard motor actions
- *Brain Research Unit, Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 2200, FIN-02015 HUT, Espoo, Finland; and
- †Department of Clinical Neurophysiology, Helsinki University Central Hospital, FIN-00290, Helsinki, Finland
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Contributed by Riitta Hari, March 15, 2007 (received for review July 3, 2006)
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Fig. 1.Experimental setup. The subject, sitting with her head supported by the helmet-shaped neuromagnetometer, is tapping the nonmagnetic drum with her right index finger while looking at her hand.
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Fig. 2.Reactivity of the MEG signals and source locations of the ≈20-Hz oscillations in a single subject. (Left) MEG signals bandpass-filtered through 14–28 Hz (in this subject) during Own Action and Observation conditions from a representative channel over the left motor cortex, the EMG from the (right) first interosseus muscle, and the trigger (TRIG) from the drum. (Right) Density plot of the current dipoles for the ≈20-Hz (n = 48) and ≈10-Hz (n = 52) oscillations; red refers to the highest density. The respective Talairach coordinates of the clusters' centers agree with the location of the M1 cortex (−34, −19, 57) and of the S1 cortex (−46, −26, 46) (Talairach Daemon Client version 2.0; http://ric.uthscsa.edu/resources).
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Fig. 3.Mean ± SEM level (solid and dotted lines, respectively) across 13 subjects of the ≈20- and ≈10-Hz oscillations during Own Action (with sound), Own Action No Sound, Observation, and Drum Sound. Baseline is from −2.9 s to −2.4 s.
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Fig. 4.Average TFRs across 13 subjects during Own Action, Own Action No Sound, Observation, and Drum Sound conditions. The TFRs are shown for intervals from −3 to 3 s and for frequencies from 5 to 35 Hz; the color bar indicates the amplitude scale (fT/cm)2.
Footnotes
- ‡To whom correspondence should be addressed. E-mail: hari{at}neuro.hut.fi
- © 2007 by The National Academy of Sciences of the USA
