Visual motion perception improvements following direct current stimulation over V5 are dependent on initial performance
- PDF / 802,115 Bytes
- 8 Pages / 595.276 x 790.866 pts Page_size
- 97 Downloads / 164 Views
RESEARCH ARTICLE
Visual motion perception improvements following direct current stimulation over V5 are dependent on initial performance Di Wu1 · Chenxi Li2 · Na Liu3 · Pengbo Xu1 · Wei Xiao1 Received: 10 March 2020 / Accepted: 25 May 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Transcranial direct current stimulation (tDCS) can improve visual perception. However, the effect of tDCS on visual perception is largely variable, possibly due to individual differences in initial performance. The goal of the present study was to evaluate the dependency of visual motion perception improvements on initial performance. Twenty-eight observers were randomly divided into two groups. Anodal tDCS and sham stimulation were separately applied to V5 (1.5 mA, 20 min), while observers performed a coherent motion direction identification task. The results showed that compared to sham stimulation, anodal tDCS induced a significant improvement in motion perception that lasted at least 20 min. In addition, the degree of improvement was dependent on initial performance, with a greater improvement magnitude observed for those with poorer initial performance. These results may have implications for understanding the nature of the stimulation rule and for the use of a customised stimulation protocol to enhance tDCS efficiency in practical applications. Keywords tDCS · Motion perception · V5 · Initial performance · Improvement magnitude
Introduction Perceptual ability is essential to perceiving the external environment. It is well known that there are two important ways to improve visual perceptual performance. One is through perceptual learning in which repeated practise of a perceptual task can improve visual performance. Studies using behavioural training have shown that practise can boost visual performance in domains from simple visual feature discrimination to complex object recognition (Sagi 2011; Kawato et al. 2014; Lu et al. 2016). Although these Communicated by Francesco Lacquaniti. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00221-020-05842-7) contains supplementary material, which is available to authorized users. * Wei Xiao [email protected] 1
Department of Medical Psychology, Air Force Medical University, Xi’an, China
2
Scholl of Nursing, Yueyang Vocational Technical College, Yueyang, China
3
Department of Nursing, Air Force Medical University, Xi’an, China
perceptual refinements can be significantly improved with only a few trials (fast learning; Fahle et al. 1995; Poggio et al. 1992; Qu et al. 2010; Tsodyks and Gilbert 2004), weeks to months of training is generally needed to attain further improvements (Polat et al. 2004). The other strategy involves noninvasive brain stimulation techniques, and transcranial electrical stimulation (tES) is particularly attractive due to its low cost and portability (Reinhart et al. 2016). tES has not only been shown to directly improve perceptual performance (Kraft et al. 2010; Richard et al.
Data Loading...
