Table 1.
False negatives | 0/12 | 0/12 | 0/12 | 1/12 | 2/12 |
False positives | 0/210 | 1/210 | 2/210 | 3/210 | 0/210 |
d′ | ∞ | ∞ | ∞ | 3.57 | ∞ |
No. of errors | |||||
Exp 1 (n = 18) | 15 | 3 | 0 | 0 | 0 |
Exp 2 (n = 18) | 13 | 1 | 2 | 1 | 1 |
Total | 28 | 4 | 2 | 1 | 1 |
There were no false negatives in 34/36 participants, and no false positives in 29/36 participants. The d′ is defined as d′ = −Z(false negative rate) − Z(false positive rate), where the function Z(p) is the inverse of the cumulative Gaussian distribution function.