Table 1. Retest Reliability and Intercorrelation of Performance Measures in the Serial Mental Addition and Comparison Task (SMACT), Separately Shown for the First and Last Testing Bins.
| Session 1 | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Performance at beginning (Testing Bin 1) | Performance at end (Testing Bin 4) | |||||||||||
| RTMD | RTM | EP | RTSD | RTCV | RTMD | RTM | EP | RTSD | RTCV | |||
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||
| Session 2 (Retest) | 1 | .85 | .99 | -.03 | .60 | .13 | .90 | .87 | -.08 | .45 | .19 | |
| 2 | .98 | .85 | -.04 | .70 | .25 | .89 | .89 | -.08 | .53 | .29 | ||
| 3 | -.11 | -.09 | .68 | -.05 | -.03 | -.05 | -.05 | .72 | .02 | .04 | ||
| 4 | .54 | .68 | -.04 | .79 | .85 | .55 | .65 | -.05 | .79 | .69 | ||
| 5 | .26 | .41 | .02 | .90 | .73 | .11 | .23 | .01 | .65 | .74 | ||
| 6 | .95 | .94 | -.10 | .50 | .21 | .91 | .98 | -.07 | .54 | .23 | ||
| 7 | .92 | .95 | -.11 | .65 | .36 | .97 | .91 | -.06 | .69 | .40 | ||
| 8 | .00 | .05 | .50 | .15 | .18 | -.02 | .03 | .66 | .05 | .09 | ||
| 9 | .53 | .65 | -.10 | .88 | .75 | .53 | .71 | .17 | .89 | .91 | ||
| 10 | .28 | .41 | -.06 | .76 | .79 | .26 | .45 | .20 | .91 | .81 | ||
Note. RTMD = median reaction time, RTM = mean reaction time, EP = error rate, RTSD = standard deviation of reaction times, RTCV = coefficient of variation of reaction times. Time bins were defined according to the amount of work, each bin containing one quarter of the whole series of trials (i.e., 408). Test–retest reliability is shown in the main diagonal; correlations for the first session are shown above, for the second session below the main diagonal. Significant correlations are denoted in bold (N = 100; r ≥ .20, p < .05; r ≥ .26, p < .01).