The discrepancy in timing between synchronous signals and visual stimulation should not be underestimated

This study aims to investigate methods for reducing the time errors. We used the Psychtoolbox to generate visual stimuli and serial port synchronization signals to explore their accuracy. Subsequently, we proposed a calibration formula to minimize the error between optical signals and visual stimuli. The findings are as follows: Firstly, the serial port synchronization signal presenting precedes visual stimulation, with a smaller lead time observed at higher refresh rates. Secondly, the lead time increases as the stimulus position deviates to the right and downwards. In Linux and IOPort(), serial port synchronization signals exhibited greater accuracy. Considering the poor accuracy and the multiple influencing factors associated with serial port synchronization signals, it is recommended to use optical signals to complete time synchronization. The results indicate that under the darkening process, the time error is - 0.23 ~ 0.08 ms (mean). This calibration formula can help measure the response latency accurately. This study provides valuable insights for optimizing experimental design and improving the accuracy of response latency. Although it only involves visual stimuli, the methods and results of this study can still serve as a reference.PMID:38485884 | DOI:10.3758/s13428-024-02382-8

Source: Behavior Research Methods - March 15, 2024 Category: Psychiatry & Psychology Authors: Biao Chen Junjie Bu Xu Jiang Ping Wang Yan Xie Zhuoyun Wang Zhen Liang Shengzhao Zhang Source Type: research