Characteristics of trained and control populations of responsive V4 neurons
| Trained | Control | |||||
|---|---|---|---|---|---|---|
| Alln = 560 (416) | M1n = 327 (238) | M2n = 233 (178) | Alln = 578 (429) | M2n = 419 (310) | M3n = 159 (119) | |
| SI | ||||||
| Mean | 0.18 | 0.19 | 0.16 | 0.12 | 0.12 | 0.13 |
| SD | 0.18 | 0.20 | 0.14 | 0.12 | 0.12 | 0.13 |
| Median | 0.11§ | 0.11 | 0.11§ | 0.08 | 0.08 | 0.08 |
| First quartile | 0.06 | 0.06 | 0.06 | 0.04 | 0.04 | 0.04 |
| Third quartile | 0.23 | 0.23 | 0.23 | 0.16 | 0.15 | 0.20 |
| MaxNFR | ||||||
| Mean | 29.4 | 31.0 | 27.2 | 23.5 | 23.8 | 22.9 |
| SD | 23.3 | 25.6 | 19.6 | 15.2 | 15.6 | 13.9 |
| Median | 22.2§ | 22.8 | 21.4‡ | 20.2 | 20.4 | 17.7 |
| First quartile | 13.7 | 13.3 | 14.1 | 12.7 | 12.2 | 13.0 |
| Third quartile | 39.2 | 41.8 | 34.7 | 31.1 | 31.7 | 29.3 |
| Fano | ||||||
| Mean | 2.16 | 1.65 | 2.86 | 3.43 | 3.19 | 4.08 |
| SD | 2.44 | 1.88 | 2.98 | 3.04 | 3.02 | 3.03 |
| Median | 1.65§ | 1.27 | 2.26† | 2.72 | 2.47 | 3.17 |
| First quartile | 0.98 | 0.76 | 1.48 | 1.70 | 1.54 | 2.16 |
| Third quartile | 2.63 | 2.00 | 3.38 | 4.11 | 3.83 | 4.60 |
| Baseline | ||||||
| Mean | 16.7 | 21.3 | 10.8 | 11.9 | 12.3 | 10.9 |
| SD | 19.9 | 23.1 | 12.6 | 11.3 | 11.8 | 9.9 |
| Median | 9.4§ | 13.3 | 6.2† | 8.7 | 8.8 | 8.4 |
| First quartile | 3.0 | 4.3 | 2.0 | 4.3 | 4.0 | 5.1 |
| Third quartile | 22.0 | 32.4 | 13.7 | 15.9 | 16.5 | 13.5 |
| Background firing rate | ||||||
| Mean | 7.5 | 9.8 | 4.8 | 5.5 | 5.7 | 5.0 |
| SD | 8.8 | 10.0 | 6.1 | 4.7 | 5.0 | 3.6 |
| Median | 4.2§ | 6.4 | 3.1‡ | 4.3 | 4.3 | 4.5 |
| First quartile | 1.7 | 2.5 | 1.4 | 2.1 | 2.1 | 2.1 |
| Third quartile | 10.1 | 13.9 | 5.8 | 7.1 | 7.5 | 6.4 |
Response parameters of all neurons that responded significantly to the stimulus, including the selectivity index, net firing rate at the preferred orientation (MaxNFR) and Fano factor at the preferred orientation, the absolute firing rate at the least-preferred orientation (baseline), and the background firing rates when no stimulus was present. The number of neurons in each subsample are shown as well as (in parentheses) the number of cells for which the factor orientation gave a significant effect.
↵§p < 10−5;
↵†p < 0.05;
↵‡p > 0.05 (NS); K–S test.