Table 1.
Predicted probability of the more likely item | LPM | |||||
---|---|---|---|---|---|---|
Subject | Success rate | Mean | Std dev | p-value for bias | Slope | Std err. of slope |
11 | 0.66*** | 0.663 | 0.138 | 0.966 | 0.966 | 0.485 |
| ||||||
12 | 0.52 | 0.702 | 0.156 | 0.013** | 0.550 | 0.459 |
| ||||||
13 | 0.62** | 0.728 | 0.143 | 0.090* | 1.579 | 0.434 |
14 | 0.66*** | 0.768 | 0.133 | 0.126 | 0.133 | 0.517 |
| ||||||
15 | 0.58 | 0.711 | 0.128 | 0.074* | 0.230 | 0.559 |
16 | 0.52 | 0.742 | 0.147 | 0.005*** | -0.075 | 0.494 |
17 | 0.58 | 0.730 | 0.136 | 0.050* | -0.325 | 0.527 |
| ||||||
18 | 0.76*** | 0.738 | 0.141 | 0.726 | 0.393 | 0.437 |
| ||||||
19 | 0.54 | 0.733 | 0.142 | 0.014** | -0.332 | 0.508 |
20 | 0.58 | 0.692 | 0.148 | 0.114 | 0.698 | 0.476 |
| ||||||
21 | 0.62** | 0.748 | 0.140 | 0.070* | 0.517 | 0.499 |
22 | 0.72*** | 0.697 | 0.130 | 0.727 | 0.381 | 0.501 |
23 | 0.68*** | 0.717 | 0.144 | 0.567 | 0.955 | 0.454 |
24 | 0.70*** | 0.763 | 0.118 | 0.320 | 1.328 | 0.544 |
| ||||||
25 | 0.44 | 0.760 | 0.145 | 0.000*** | -0.420 | 0.494 |
26 | 0.52 | 0.733 | 0.141 | 0.007*** | -0.312 | 0.515 |
| ||||||
27 | 0.72*** | 0.738 | 0.155 | 0.761 | 1.114 | 0.392 |
| ||||||
Group Mean | 0.613*** | 0.727 | 0.140 | < 0.001*** | 0.434 | 0.488 |
Std. Dev. | 0.089 | 0.028 | 0.010 | 0.615 | 0.043 |
Notes: Based on an initial voxel selection threshold of 0.01. Asterisks are used to denote statistical significance only in the columns for “success rate” (difference from uninformed benchmark of 0.50, binomial test for individual rates, 1-sided t-test for group mean rate) and “p-value for bias” (difference between success rate and mean predicted probability, two-sided t-test), as follows:
denotes p<0.1;
denotes p<0.05;
denotes p<0.01. “Success rate” is the frequency with which the item with highest predicted choice probability in each pair was actually chosen; “p-value for bias” refers to the test statistic for the hypothesis that the success rate equals the mean predicted probability, and “LPM” refers to a simple linear probability model relating a success indicator to the predicted probability. “Group Mean” is the mean of within-subject means, and “Std. Dev.” is the standard deviation of within-subject means.