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Related Experiment Video

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Using Saccadometry with Deep Brain Stimulation to Study Normal and Pathological Brain Function
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Developing clinically practical transcranial direct current stimulation protocols to improve saccadic eye movement

Po Ling Chen1, Liana Machado1

  • 1Department of Psychology and Brain Health Research Centre, University of Otago and Brain Research, New Zealand.

Journal of Eye Movement Research
|April 8, 2021
PubMed
Summary
This summary is machine-generated.

Anodal transcranial direct current stimulation (tDCS) over the frontal eye field (FEF) or dorsolateral prefrontal cortex (DLPFC) did not improve saccadic eye movement control in young or older adults. The clinically practical protocol showed no benefits compared to sham stimulation.

Keywords:
Electrical brain stimulationantisaccadeseye movementeye trackingoculomotor controlsaccades

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Area of Science:

  • Neuroscience
  • Cognitive Science
  • Rehabilitation Science

Background:

  • Anodal transcranial direct current stimulation (tDCS) over the frontal eye field (FEF) has shown promise for enhancing saccadic eye movement control in young adults.
  • The efficacy of tDCS for saccadic control in older adults and with clinically practical protocols remains less understood.

Purpose of the Study:

  • To investigate the effectiveness of anodal tDCS applied over the FEF and dorsolateral prefrontal cortex (DLPFC) for improving saccadic eye movement control.
  • To assess whether a simplified, clinically translatable tDCS protocol yields benefits in both young and older adults.
  • To compare the effects of tDCS on saccadic performance contralateral versus ipsilateral to the stimulated brain region.

Main Methods:

  • Twenty young and 10 older adults participated in the study.
  • Participants underwent three sessions: active tDCS over FEF, active tDCS over DLPFC, and sham tDCS.
  • Electrode placement utilized simple measurements for clinical practicality.
  • Saccadic eye movements were measured to assess performance.

Main Results:

  • Anodal tDCS over either the FEF or DLPFC did not result in significant improvements in saccadic performance compared to the sham condition in either age group.
  • No significant differences were observed in saccadic performance between contralateral and ipsilateral stimulation sites.
  • The simplified electrode placement protocol may not be sufficient for effectively targeting the relevant frontal subregions.

Conclusions:

  • The tested clinically practical tDCS protocol, using simple measurements for electrode placement, did not enhance saccadic eye movement control in young or older adults.
  • Further research is needed to optimize tDCS parameters, including electrode montage and current intensity, for effective saccadic control enhancement.
  • Future studies should incorporate a sham control and refine targeting strategies for developing clinically applicable tDCS protocols.