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. Author manuscript; available in PMC: 2011 Oct 13.
Published in final edited form as: J Neurosci. 2011 Apr 13;31(15):5721–5729. doi: 10.1523/JNEUROSCI.6135-10.2011

Figure 1. Stop Signal Task.

Figure 1

A. Each trial began with a fixation cross, followed 500 ms later by the appearance of a white square (Go signal). The square appeared to either the left or the right of the fixation cross requiring a response from the corresponding hand. Stop trials were identical to go trials, except they were less likely (33% of trials) and the white square turned red after a variable delay (stop signal delay). B. Schematic illustrating the way in which SSRT is calculated. The Stop Signal Delay (SSD) is varied dynamically to yield a probability of stopping, p(stop) of ~0.5. Assuming the Go and Stop processes race each other independently, this 50% point will correspond to the mean of the Go distribution. SSRT can then be calculated as MeanGoRT-SSD.