The previous studies have detected changes of brain electrical activity after the cerebellar hemisphere rTMS and the vermis rTMS. We supposed that right cerebellar 1Hz rTMS evokes changes in the left frontal cortex. The aim of our study was to determine if 1Hz cerebellar hemisphere and 1 Hz vermis rTMS induces different effect in frontal electrical activity.

We used 10 minutes of 1 Hz rTMS (with 600 impulses) in two sessions (first session- application over the right cerebellar hemisphere, second over the vermis). 31-channel EEG was recorded in 5 right-handed healthy volunteers before and after rTMS. The 3D distribution of the current density was revealed by a method of qEEG- Low Resolution Brain Electromagentic Tomography (LORETA, Pascual-Marqui et al. 1994; 1999).

After 1 Hz right cerebellar hemisphere rTMS the current density decreased in the alfa2, beta1, beta2 and beta3 band over the frontal cortex including medial frontal cortex and the anterior cingulate (p<0.01). After 1 Hz vermis rTMS we found no significant changes.

Our results suggest the possibility to influence the frontal cortical activity by means of the cerebellar hemisphere rTMS. No significant changes after 1Hz vermis rTMS may suggest either large distance between the rTMS coil and the vermis or our sample is too small to make definitive conclusions.

Supported by MZ0PCP2005 and 1M0517