Proactive and Reactive Response Inhibition across the Lifespan
The SSRT represents the duration of the inhibitory process, i.e. the speed of inhibition. Selectivity represents the slowing that occurs on the concurrent response when an action is inhibited. Here we use the intraclass correlation (ICC) to quantify the reliability of these measures as a function of the number of trials that are used in the estimation and the trial type. If SSRT and selectivity are estimated from the first game only and compared to the second game (# of blocks = 1 in the figure), reliability is ‘poor’ for all measures (following criteria from ). Reliability increases as more blocks are used for estimation. However, reliable estimation of selectivity requires approximately 4 times as much data as reliable estimation of SSRT as shown by the rightward shift of the selectivity curves compared to SSRT curves. Error bars represent 95% CI on the ICC, n = number of subjects for whom sufficient blocks were available, e.g. 26,012 participants had at least 2 submitted blocks so that the reliability of the first game to the second game could be calculated.