Methods : We followed the PRISMA guidelines, and a review protocol was registered with PROSPERO before study commencement (CRD42021255882). We searched Embase, Medline, PsychInfo, PubMed and Web of Science using relevant keywords. The search covered the period from database inception until 4th February 2021. Comprehensive meta-analysis (CMA) software was used for quantitative analysis.
Results : Twenty-four studies were included in the meta-analyses. A single session of visual cortex transcranial electrical stimulation (tES; Hedges’s g: 0.56, 95% CI: 0.23-0.90, p=0.001) and anodal transcranial direct current stimulation (tDCS; Hedges’s g: 0.66, 95% CI: 0.27-1.04, p=0.001) reduced visual crowding. Other pooled analyses showing significant effects included impaired motion perception following cathodal tDCS of the middle temporal area (Hedges’s g: 0.46, 95% CI: 0.006-0.92, p=0.047), improved contrast sensitivity (Hedges’s g: 0.23, 95% CI: 0.02-0.44, p=0.03), and increased visual evoked potential amplitude (Hedges’s g: 0.38, 95% CI: 0.11-0.66, p=0.006) following visual cortex tES. The effects of visual cortex anodal tDCS on visual acuity, motion perception, and contrast sensitivity were not statistically significant.
Conclusions : There are significant effects of visual cortex NIBS on crowding, motion perception, contrast sensitivity and visual evoked potential amplitude among normally sighted individuals.
|Title of host publication||Investigative Ophthalmology & Visual Science|
|Publication status||Published - Jun 2022|
|Event||Association for Research in Vision and Ophthalmology (ARVO) Annual Meeting 2022 - Denver, United States|
Duration: 1 May 2022 → 4 May 2022
|Conference||Association for Research in Vision and Ophthalmology (ARVO) Annual Meeting 2022|
|Abbreviated title||ARVO 2022|
|Period||1/05/22 → 4/05/22|