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SUMMARY:Transcranial Static Magnetic Field Stimulation over the Motor and 
 Visual Cortices
DTSTART:20130617T100000
DTEND:20130617T110000
DTSTAMP:20260604T003837Z
UID:eae95fa268344976ccfcb76e7d094142ef829c3fa61bd9250aa99044
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Antonio Oliviero MD PhD\, FENNSI\, Hospital Nacional de 
 Parapléjicos\, Toledo.\nTranscranial Static Magnetic Field Stimulation ov
 er the Motor and Visual Cortices: A new non-invasive neuromodulation stra
 tegy\nThe non-invasive modulation of motor cortex excitability by the appl
 ication of static magnetic fields through the scalp was investgated in hea
 lthy humans. Static magnetic fields were obtained by using cylindrical NdF
 eB magnets. (tSMS) in conscious subjects. We observed an average reduction
  of motor cortex excitability of up to 25%\, as revealed by TMS\, which la
 sted for several minutes after the end of 10 minutes of static magnetic fi
 eld stimulation (tSMS). The effect of tSMS was dose-dependent (intensity o
 f the magnetic field) and duration dependent\, but not polarity-dependent.
  We used transcranial electric stimulation (TES) to establish that the tSM
 S-induced reduction of motor cortex excitability was not due to corticospi
 nal axon and/or spinal excitability\, but specifically involved intracorti
 cal networks..\nWe further explored the tSMS effects on EEG oscillations i
 n the visual cortex and during visual attentional performance in healthy h
 umans. We specifically examined the hypothesis that these effects could be
  related to an increase of alpha band activity\, and therefore\, associate
 d to an “inhibitory” effect. During real but not sham tSMS over the vi
 sual cortex\, there was a significant increase of the alpha band power. Mo
 reover\, we observed a similar reaction time (RTs) pattern during real and
  sham tSMS for most of trials. However\, a significant slowing of RTs emer
 ged across those trials with a higher difficulty levels during real in com
 parison to sham tSMS.\nFurther studies using tSMS are required to extend t
 he knowledge of the functional significance of cortical excitability chang
 es and brain oscillations changes induced by the application of small magn
 ets over the scalp. These results suggest that tSMS using small static mag
 nets may be a promising tool to modulate cerebral excitability in a non-in
 vasive\, painless\, and reversible way.
LOCATION:AI1153 http://plan.epfl.ch/?room=AI%201153
STATUS:CONFIRMED
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