Table 1.
Session | a | Ter | η | sz | v1 | v2 | v3 | v4 | po | st | vc | z | χ2 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Experimental Group | |||||||||||||
Baseline | .151 | .428 | .171 | .066 | .546 | .416 | .271 | .093 | .003 | .138 | .007 | .075 | 101 |
Sleep-deprived | .189 | .401 | .216 | .130 | .403 | .318 | .198 | .083 | .101 | .165 | .011 | .089 | 163 |
Recovery | .151 | .420 | .209 | .083 | .615 | .491 | .308 | .110 | .001 | .113 | .005 | .076 | 101 |
Control Group | |||||||||||||
Baseline | .152 | .428 | .179 | .069 | .558 | .452 | .300 | .097 | .007 | .139 | .004 | .073 | 88 |
Control | .136 | .426 | .165 | .061 | .549 | .453 | .294 | .099 | .012 | .127 | .005 | .064 | 79 |
Recovery | .132 | .412 | .156 | .061 | .579 | .456 | .311 | .100 | .014 | .119 | −.002 | .064 | 81 |
Note—a, upper boundary of accumulation of information over time; Ter, mean of the distribution of times taken up by the nondecision component, in seconds. η, sz, and st represent across-trial variability in drift rate, in starting point, and in the nondecision component, respectively. v1, v2, v3, and v4 represent the four distinct drift-rate parameters for the eight numerosity categories (see the text for details). po, proportion of contaminants; vc, drift criterion; z, starting point of accumulation of information over time. χ2 represents the goodness-of-fit index with critical value 102 for 76 degrees of freedom. For a total of k numerosity categories and a model with m parameters, the degrees of freedom are k(12 − 1) − m, where 12 comes from the number of bins between and outside the response time quantiles for correct and error responses for a single category (minus 1, because the total probability mass must be 1). There were k = 8 numerosity categories in the experiment and m = 12 parameters in the model, so df = 88 − 12 = 76.