Transcranial direct current stimulation modulates human color discrimination in a pathway-specific manner

Página do item simplificado
dc.contributor.authorCosta T.L.
dc.contributor.authorNagy B.V.
dc.contributor.authorBarboni M.T.S.
dc.contributor.authorBoggio P.S.
dc.contributor.authorVentura D.F.
dc.date.accessioned2024-03-13T01:07:08Z
dc.date.available2024-03-13T01:07:08Z
dc.date.issued2012
dc.description.abstractPrevious research showed that transcranial direct current stimulation (tDCS) can modulate visual cortex excitability. However, there is no experiment on the effects of tDCS on color perception to date. The present study aimed to investigate the effects of tDCS on color discrimination tasks. Fifteen healthy subjects (mean age of 25.6 ± 4.4 years) were tested with Cambridge Color Test 2.0 (Trivector and ellipses protocols) and a Forced-choice Spatial Color Contrast Sensitivity task (vertical red-green sinusoidal grating) while receiving tDCS. Anodal, cathodal, and sham tDCS were delivered at Oz for 22 min using two square electrodes (25 cm2 with a current of 1.5 mA) in sessions separated by 7 days. Anodal tDCS significantly increased tritan sensitivity (p < 0.01) and had no significant effect on protan, deutan, or red-green grating discrimination.The effects on the tritan discrimination returned to baseline after 15 min (p < 0.01). Cathodal tDCS reduced the sensitivity in the deutan axis and increased sensitivity in the tritan axis (p < 0.05).The lack of anodal tDCS effects in the protan, deutan, and red-green grating sensitivities could be explained by a "ceiling effect" since adults in this age range tend to have optimal color discrimination performance for these hues. The differential effects of cathodal tDCS on tritan and deutan sensitivities and the absence of the proposed ceiling effects for the tritan axes might be explained by Parvocellular (P) and Koniocellular (K) systems with regard to their functional, physiological, and anatomical differences.The results also support the existence of a systematic segregation of P and K color-coding cells in V1. Future research and possible clinical implications are discussed. © 2012 Costa, Nagy, Barboni, Boggio and Ventura.
dc.description.issuenumberSEP
dc.description.volume3
dc.identifier.doi10.3389/fpsyt.2012.00078
dc.identifier.issn1664-0640
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/36755
dc.relation.ispartofFrontiers in Psychiatry
dc.rightsAcesso Aberto
dc.subject.otherlanguageColor vision
dc.subject.otherlanguageKoniocellular pathway
dc.subject.otherlanguageParvocellular pathway
dc.subject.otherlanguageTDCS
dc.subject.otherlanguageTranscranial direct current stimulation
dc.subject.otherlanguageV1
dc.titleTranscranial direct current stimulation modulates human color discrimination in a pathway-specific manner
dc.typeArtigo
local.scopus.citations17
local.scopus.eid2-s2.0-84867123319
local.scopus.updated2024-05-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84867123319&origin=inward
Arquivos
Coleções
Artigos de periódico