Long-Lasting Enhancement of Visual Perception with Repetitive Noninvasive Transcranial Direct Current Stimulation

We explore whether contrast sensitivity, a main function of the primary visual cortex, can be improved in healthy subjects by repetitive, noninvasive anodal transcranial direct current stimulation

Janina R. Behrens; Antje Kraft; Kerstin Irlbacher; Holger Gerhardt; Manuel C. Olma; Stephan A. Brandt


Scholarcy highlights

  • Sensitivity to contrast is crucial, for vision at dusk and nighttime, and in daylight, e.g., while reading
  • A repeated-measures analysis of variance was performed to compare the development at the follow-up dates, revealing that the tDCSboosted enhancement of contrast perception did not lead to significant differential decline of contrast perception after the stimulation period compared to that in the control group
  • In contrast to the majority of previous studies, we used a more precise method to determine the location of the polarization electrode on the surface using individual MRI data and navigation software
  • We attribute the observation of long-lasting effects to this method and the repetitive transcranial direct current stimulation application
  • Our results suggest that repetitive tDCS over V1 may be a promising neurorehabilitation tool for patients with chronic visual disability occurring after stroke
  • The tDCS effects demonstrated by our study did not require an extensive, time-consuming, and effortful simultaneous visual training paradigm, such as vision restoration therapy
  • This offers an important advantage in the development of rehabilitation programs for older patients who are more severely affected by diseases

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