Table 1.
Results of various analyses broken down by individual subject
| Subject J | Subject T | Combined | |
|---|---|---|---|
| Macaques are efficient foragers in a computerized search task | |||
| No. of trials | 23,826 | 20,509 | 44,335 |
| Offers viewed per 4 offer trial | 1.803 | 1.953 | 1.8722 |
| Offers viewed per 7 offer trial | 1.9996 | 2.1605 | 2.0742 |
| Average reward obtained on 4 offer trials | 69.46% | 67.87% | 68.72% |
| Average reward obtained on 7 offer trials | 73.20% | 73.75% | 73.46% |
| Behavioral threshold across all trials | 49.26% | 56.77% | 52.56% |
| Behavioral threshold for 4 offer trials | 46.77% | 55.06% | 50.30% |
| Behavioral threshold for 7 offer trials | 50.99% | 58.29% | 54.33% |
| vmPFC neurons signal values of offers | |||
| Percent of neurons significantly encoding current offer value | 40.00% | 25.00% | 33.61% |
| vmPFC neurons encode environmental variables previous outcome | |||
| Beta correlation coefficient of behavioral threshold against previous outcome value (p value) | 0.0372 (0.2030) | 0.1292 (<0.001) | 0.0602 (<0.001) |
| Percent of neurons significantly encoding previous outcome value (p value) | 27.14% (<0.001) | 17.31% (0.0010) | 22.95% (<0.001) |
| Beta correlation coefficient of firing rate against previous outcome value (p value) | −0.1415 (0.6039) | 0.7718 (0.0042) | −0.4974 (0.0377) |
| Previous offer | |||
| Beta correlation coefficient of behavioral threshold against previous offer value (p value) | 0.1243 (0.1202) | 0.1515 (<0.001) | 0.1073 (0.0019) |
| Percent of neurons significantly encoding previous offer value (p value) | 24.29 (<0.001) | 5.77 (1.000) | 16.39 (<0.001) |
| Beta correlation coefficient of firing rate against previous offer value (p value) | 7.334 (<0.001) | 0.2565 (0.0736) | 4.391 (<0.001) |
| View number | |||
| Beta correlation coefficient of behavioral threshold against view number (p value) | −0.04849 (0.0063) | −0.0267 (<0.001) | −0.0346 (<0.001) |
| Percent of neurons significantly encoding view number (p value) | 42.86% (<0.001) | 19.23 (<0.001) | 32.79 (<0.001) |
| Beta correlation coefficient of firing rate against view number (p value) | 0.02553 (0.00895) | 0.03073 (0.03272) | 0.02775 (0.017549) |
| Reward rate | |||
| Beta correlation coefficient of behavioral threshold against reward rate of past 10 trials (p value) | 0.4708 (<0.001) | 0.3133 (<0.001) | 0.2361 (<0.001) |
| Percent of neurons significantly encoding reward rate of past 10 trials (p value) | 34.29 (<0.001) | 30.77 (<0.001) | 0.3279 (<0.001) |
| Spatial positions of offers | |||
| Percentage of neurons encoding current offer quadrant position | 30.00% | 11.54% | 22.13% |
| Percentage of neurons encoding current offer left-right position | 18.57% | 19.23% | 18.85% |
| Percentage of neurons encoding current offer up-down | 22.86% | 1.92% | 13.93% |