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. Author manuscript; available in PMC: 2010 Dec 20.
Published in final edited form as: Psychol Res. 2008 Nov 22;73(6):744–750. doi: 10.1007/s00426-008-0198-7

Figure 1. Fast/Slow Change Signal task.

Figure 1

The task is a modified version of the Change Signal task of (Brown & Braver, 2005). (A) Subjects must make a button press response with either the left or right index finger corresponding to the direction of the last error shown. In the Change condition, a second arrow appears after a delay and instructs the subject to withhold a response to the first arrow and instead respond in the opposite direction based on the second arrow. Visual feedback (Correct, Error, or Faster) is given following the response. Failures to respond before the deadline lead to the feedback signal of “Faster”. (B) In the Low condition, the change signal delay (CSD) is short, meaning that the second arrow appears quickly after first, and error rates are therefore very low (around 5%). The response deadline is 1000 msec. In the HiSlow condition, the CSD is longer, and errors of commission are much more likely (around 50%). In the HiFast condition, the same CSD is used as in the low condition, but the response deadline is shortened to force errors in which the response is not generated before the deadline. The deadline is manipulated to force tardy errors in 50% of change signal trials.