Table 3.
Free Choice versus Random: Percentage of trials in which the Free Choice icon was selected. Experiment 2a shows the percentage averaged across ten 50-block sets with different stimuli. Experiment 2b shows the percentage out of one 500-block set (the number of trials differed slightly per animal, see text for details).
| Experiment 2a | Experiment 2b | |||||
|---|---|---|---|---|---|---|
| Macaques | Percentage Free Choice/Total |
t(9) | P | Percentage Free Choice/Total |
Free Choice/Total |
Cumulative Binomial p |
| Han | 54.33 | .673 | .518 | 37.97 | 183/482 | 0.999 |
| Lou | 59.30 | 1.556 | .154 | 70.06 | 337/481 | <.001 |
| Obi | 54.67 | 1.561 | .153 | 61.25 | 294/480 | <.001 |
| Chewie | 54.67 | .953 | .366 | 47.50 | 228/480 | 0.873 |
| Luke | 49.67 | −.104 | .919 | 46.67 | 224/480 | 0.934 |
| Average | 54.53 | - | - | 52.69 | - | - |
| Capuchins | ||||||
| Liam | 56.67 | 2.148 | .060 | 62.71 | 301/480 | <.001 |
| Nala | 51.33 | .323 | .754 | 52.07 | 251/482 | 0.193 |
| Gabe | 52.67 | 1.149 | .280 | 64.10 | 250/390 | 0.168 |
| Gambit | 53.00 | 1.029 | .331 | 76.46 | 367/480 | <.001 |
| Logan | 50.00 | .000 | 1.000 | 76.04 | 365/480 | <.001 |
| Nkima | 51.33 | .302 | .770 | 56.52 | 273/483 | 0.002 |
| Average | 52.50 | - | - | 64.65 | - | - |