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.

经颅直流电刺激（tDCS）可以改善视觉感知。然而，tDCS 对视觉感知的影响差异很大，可能是由于初始表现的个体差异所致。本研究的目的是评估视觉运动感知改善对初始表现的依赖性。二十八名观察者被随机分为两组。阳极 tDCS 和假刺激分别应用于 V5（1.5 mA，20 分钟），同时观察者执行连贯运动方向识别任务。结果表明，与假刺激相比，阳极 tDCS 引起运动知觉显着改善，持续至少 20 分钟。此外，改善程度取决于初始表现，初始表现较差的人观察到的改善幅度更大。这些结果可能对理解刺激规则的性质以及使用定制的刺激方案来提高实际应用中的 tDCS 效率具有影响。