Stop signal task

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Stop Signal task: The stop signal task is based on the “race horse model” of response inhibition, where two separate processes determine the response: the go process and the stop process 44,45. We will use the PsychLab 101 (Neurobehavioral Systems, Inc, Berkley, CA) application to run the stop signal task on an Apple iPad (Apple, Cupertino, CA). Participants are instructed to tap the right or left side of the screen based on the prompt symbol shown (the letter “A” or “Z”), and to not tap if a red “X” appears on the screen after the presentation of the symbol. All visual stimuli are presented for 500 ms. The stop signal occurs after a variable delay between 50-500 ms after the presentation of the symbol and is present in 25% of the trials45.

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