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Modulating Cognition Using Transcranial Direct Current Stimulation of the Cerebellum
Published on: February 15, 2015
Modulation of steady-state auditory evoked potentials by cerebellar rTMS
Maria A Pastor1, Gregor Thut, Alvaro Pascual-Leone
1Center for Noninvasive Brain Stimulation, Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA. mapastor@unav.es
Experimental Brain Research
|July 11, 2006
Summary
This study investigated the cerebellum's role in auditory processing using electroencephalography (EEG) and repetitive transcranial magnetic stimulation (rTMS). Cerebellar rTMS targeting the auditory cortex modulated steady-state auditory evoked responses (SSAERs), particularly at 40 Hz.
Area of Science:
- Neuroscience
- Auditory Neuroscience
- Cerebellar Function
Background:
- Steady-state auditory evoked responses (SSAERs) measured by electroencephalography (EEG) correlate with cerebellar blood flow.
- The cerebellum's precise role in controlling SSAERs remains to be fully elucidated.
Purpose of the Study:
- To investigate the cerebellum's involvement in regulating SSAERs.
- To determine if transient disruption of the cerebellar hemisphere affects SSAERs.
Main Methods:
- Six healthy volunteers underwent EEG recording of SSAERs to 32, 40, and 47 Hz click-trains.
- Repetitive transcranial magnetic stimulation (rTMS) was applied to the cerebellar hemisphere contralateral to the stimulated ear.
- SSAERs post-rTMS were compared to baseline and sham stimulation conditions.
Main Results:
- Cerebellar rTMS significantly reduced SSAER amplitude at 40 Hz.
- A trend towards reduced SSAER amplitude was observed at 32 Hz.
- No significant effects were found for 47 Hz SSAERs or with ipsilateral/sham stimulation.
Conclusions:
- Cerebellar output influences cortical auditory processing, as evidenced by rTMS-induced changes in SSAERs.
- The cerebellum appears to be part of a distributed network regulating cortical oscillations.
- The findings suggest frequency-specific cerebellar control over auditory-driven neuronal oscillations, particularly at 40 Hz.
