Repetitive TMS temporarily alters brain diffusion.

Mottaghy, F M; Gangitano, M; Horkan, C; Chen, Y; Pascual-Leone, A; Schlaug, G · Neurology · 2003

basic_science · Level V

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Abstract

The authors investigated whether repetitive transcranial magnetic stimulation (rTMS) at 1 Hz (12 minutes; 90% of motor threshold) to the primary motor cortex (M1) leads to changes in diffusion-weighted imaging (DWI). After the rTMS train, there was a temporary small restriction in diffusion within the targeted left M1 that disappeared after 5 minutes. These findings provide a physiologic correlate to the reported behavioral consequences of off-line 1-Hz rTMS and reveal the transitory nature of the effects.

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