Hiraoka Koichi, Igawa Kyudo, Kashiwagi Mina, Nakahara Chisato, Oshima Yuki, Takakura Yu
a College of Health and Human Sciences , Osaka Prefecture University , Habikino , Japan.
Laterality. 2018 Jan;23(1):51-66. doi: 10.1080/1357650X.2017.1311906. Epub 2017 Apr 5.
The objective of the present study was to investigate whether the stop and go processes of the motor response are asymmetrical and whether the asymmetries are dependent on handedness and the response selection process that is engaged. Both right-handed and left-handed participants abducted either the left or right index finger in response to an imperative cue in the choice reaction time (choice RT) or the simple RT task. A stop cue was presented after the imperative cue with a probability of .25. When the stop cue was presented, the participants withheld the prepared response. On the choice RT task, left-handed participants had significantly shorter RT and stop signal reaction time (SSRT) with the left versus the right hand, whereas right-handers showed no difference between hands on either measure. In the simple RT task, the RT and SSRT were not significantly different between the groups or the response sides. These results indicate that both the stop and go processes of the prepared left-hand response are completed earlier than those of the right-hand response in left-handed individuals when the stimulus-response process involves a response selection process.
本研究的目的是调查运动反应的停止和继续过程是否不对称，以及这种不对称是否取决于利手和所参与的反应选择过程。右利手和左利手参与者在选择反应时（choice RT）或简单反应时任务中，根据指令线索外展左手或右手食指。指令线索出现后，以0.25的概率呈现停止线索。当呈现停止线索时，参与者抑制准备好的反应。在选择反应时任务中，左利手参与者用左手的反应时和停止信号反应时（SSRT）显著短于用右手的，而右利手者在这两项测量上双手之间没有差异。在简单反应时任务中，两组之间或反应侧之间的反应时和SSRT没有显著差异。这些结果表明，当刺激-反应过程涉及反应选择过程时，左利手个体中准备好的左手反应的停止和继续过程都比右手反应完成得更早。
