Transcranial magnetic stimulation over the cerebellum delays predictive head movements in the coordination of gaze
Acta Oto-Laryngologica, Supplement, ISSN: 0365-5237, Vol: 545, Issue: 545, Page: 140-144
2001
- 9Citations
- 22Captures
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Metrics Details
- Citations9
- Citation Indexes9
- CrossRef1
- Captures22
- Readers22
- 22
Conference Paper Description
We investigated coordinated saccadic eye and head movements following predictive horizontal visual targets at ± 30° by applying transcranial magnetic stimulation (TMS) over the cerebellum before the start of the gaze movement in 10 young subjects. We found three effects of TMS on eye-head movements: 1. Saccadic latency effect. When stimulation took place shortly before movements commenced (75-25 ms before), significantly shorter latencies were found between predictive target presentation and initiation of saccades. Eye latencies were significantly decreased by 45 ms on average, but head latencies were not. 2. Gaze amplitude effect. Without TMS, for the 60° target amplitudes, head movements usually preceded eye movements, as expected (predictive gaze type 3). With TMS 5-75 ms before the gaze movement, the number of eye movements preceding head movements by 20-50 ms was significantly increased (p <0.001) and the delay between eye and head movements was reversed (p <0.001), i.e. we found eye-predictive gaze type 1. 3. Saccadic peak velocity effect. For TMS 5-25 s before the start of head movement, mean peak velocity of synkinetic eye saccades increased by 20-30% up to 600°/s, compared to 350-400°/s without TMS. We conclude that transient functional cerebellar deficits exerted by means of TMS can change the central synkinesis of eye-head coordination, including the preprogramming of the saccadic pulse and step of a coordinated gaze movement.
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