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Table 1. 
Group Mean Behavioral Data
 MSLMSRGLGR
Go cue RT (sec) 0.560 (0.087) 0.556 (0.088) 0.434 (0.050) 0.425 (0.044) 
Go alternative RT (sec) 0.562 (0.088) 0.556 (0.091) – – 
Go alternative slow RT (sec) 0.683 (0.123) 0.660 (0.125) – – 
Probe alternative RT (sec) 0.746 (0.139) 0.758 (0.150) – – 
Stopping interference (sec) 0.063 (0.067) 0.098 (0.074) – – 
Go accuracy (%) 92.49 (3.50) 93.38 (5.01) 98.75 (1.14) 99.06 (1.13) 
Probe accuracy (%) 57.29 (8.17) 58.51 (5.60) – – 
SSD (sec) 0.252 (0.067) 0.257 (0.068) – – 
Stop signal RT (sec) 0.308 (0.039) 0.301 (0.040) – – 
 MSLMSRGLGR
Go cue RT (sec) 0.560 (0.087) 0.556 (0.088) 0.434 (0.050) 0.425 (0.044) 
Go alternative RT (sec) 0.562 (0.088) 0.556 (0.091) – – 
Go alternative slow RT (sec) 0.683 (0.123) 0.660 (0.125) – – 
Probe alternative RT (sec) 0.746 (0.139) 0.758 (0.150) – – 
Stopping interference (sec) 0.063 (0.067) 0.098 (0.074) – – 
Go accuracy (%) 92.49 (3.50) 93.38 (5.01) 98.75 (1.14) 99.06 (1.13) 
Probe accuracy (%) 57.29 (8.17) 58.51 (5.60) – – 
SSD (sec) 0.252 (0.067) 0.257 (0.068) – – 
Stop signal RT (sec) 0.308 (0.039) 0.301 (0.040) – – 

Values are provided for MSL trials, MSR trials, GL trials, and GR trials. Go cue RT reflects the mean RT (and standard deviation) of go trials (no stop signal) for the hand that definitely will respond, for example, on MSL trials, it is the right hand. Go alternative RT is mean RT of go trials for the hand that might have to stop (but on go trials where no stop signal occurred). Go alternative RT slow is similar except now only the slow half of the distribution is taken. Probe alternative RT is the mean RT of the continuing (nonstopped hand) on trials where the participant correctly stopped. The stopping interference effect is the probe alternative RT minus the go alternative slow RT: This is a key variable that indicates the selectivity of stopping (i.e., the value would be zero if stopping were perfectly selective—it would not interfere with the continuing hand). Go accuracy is whether participants pressed the correct buttons on go trials (e.g., with both index fingers or both pinkie fingers). Probe accuracy is the probability of correctly stopping the cued hand when a stop signal occurred (e.g., on an MSL trials, the left hand is stopped and the participant continues with the right hand). The SSD is the delay between the go signal and the stop signal. SSRT is the stop signal RT, that is, mean go cue RT minus SSD.

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