RE: Stop Signal Task output

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Stop Signal Task output

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sibylle.petersen	sibylle.petersen posted 9 Years Ago Topic Details Share Topic
Group: Awaiting Activation Posts: 1, Visits: 2	Dear all I plan to use the Stop Signal Task in one of my studies. I have looked at the script in the task library and the paper by Verbruggen et al., 2008. I am very unsure how to interpret the output. If anyone could briefly respond whether my ideas about how to interpret these values are correct (see below) I would be very grateful. Thank you and have a good day Sibylle expressionsp_rs:p respond if signal? expressionsssd: delay stop signal? expressionsssrt :covert latency of the stop process? expressionssr_rt: mean signal respond reaction time? expressionsns_rt: reaction times no-signal trials? expressionsns_hit: percentage hits no-signal trials? expressionsmiss: percentage misses in no-signal trials? expressionsz_score:probability to inhibit expressionsp_value: probability to inhibit
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Dave	Dave posted 9 Years Ago ANSWER Post Details Share Post
Group: Administrators Posts: 13K, Visits: 104K	Sure. If you look at Verbruggen et al. (2008), p. 482, you'll find: The following variables are estimated or calculated: - mean p(respond\|signal), - mean SSD, - SSRT, - mean signal-respond RT, - no-signal RT, - percentage of correct responses on no-signal trials, and the - percentage of missed responses on no-signal trials. [...] will also calculate a - z score and the corresponding - p value to indicate whether each subject inhibited significantly more or less than 50% of the time. These correspond to - expressions.p_rs - expressions.ssd - expressions.ssrt - expressions.sr_rt - expressions.ns_rt - expressions.ns_hit - expressions.miss - expressions.z_score - expressions.p_value in the order given. The variable names follow those in the original program by Verbruggen et al.
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