School of Speech, Language and Hearing Sciences, San Diego State University, San Diego, California, USA.
Department of Psychology, San Diego State University, San Diego, California, USA.
Psychophysiology. 2022 Mar;59(3):e13975. doi: 10.1111/psyp.13975. Epub 2021 Nov 17.
Repetition priming and event-related potentials (ERPs) were used to investigate the time course of sign recognition in deaf users of American Sign Language. Signers performed a go/no-go semantic categorization task to rare probe signs referring to people; critical target items were repeated and unrelated signs. In Experiment 1, ERPs were time-locked either to the onset of the video or to sign onset within the video; in Experiment 2, the same full videos were clipped so that video and sign onset were aligned (removing transitional movements), and ERPs were time-locked to video/sign onset. All analyses revealed an N400 repetition priming effect (less negativity for repeated than unrelated signs) but differed in the timing and/or duration of the N400 effect. Results from Experiment 1 revealed that repetition priming effects began before sign onset within a video, suggesting that signers are sensitive to linguistic information within the transitional movement to sign onset. The timing and duration of the N400 for clipped videos were more parallel to that observed previously for auditorily presented words and was 200 ms shorter than either time-locking analysis from Experiment 1. We conclude that time-locking to full video onset is optimal when early ERP components or sensitivity to transitional movements are of interest and that time-locking to the onset of clipped videos is optimal for priming studies with fluent signers.
重复启动和事件相关电位 (ERPs) 被用于研究美国手语聋人使用者的符号识别的时间进程。手语使用者执行了一个 Go/No-go 语义分类任务，对罕见的探针符号进行分类，这些符号指的是人物；关键的目标项目是重复的和不相关的符号。在实验 1 中，ERPs 要么与视频的开始时间锁相，要么与视频内的符号开始时间锁相；在实验 2 中，使用相同的完整视频进行剪辑，以便视频和符号开始时间对齐（去除过渡运动），并且 ERPs 与视频/符号开始时间锁相。所有分析都揭示了 N400 重复启动效应（重复的符号比不相关的符号负性更小），但 N400 效应的时间和/或持续时间不同。实验 1 的结果表明，重复启动效应在视频内的符号开始之前就开始了，这表明手语使用者对手势开始前的过渡运动中的语言信息敏感。剪辑视频的 N400 的时间和持续时间与之前听觉呈现单词的观察结果更为相似，比实验 1 中的任何时间锁定分析都短 200 毫秒。我们得出结论，当早期 ERP 成分或对手势过渡运动的敏感性感兴趣时，最佳的时间锁定是全视频开始，而对于流利的手语使用者的启动研究，最佳的时间锁定是剪辑视频的开始。
