A | B | C | D | ||
---|---|---|---|---|---|
Figure diameter | Number of neurons | Orientation-defined figure | Figure alone | Surround alone | Contextual modulation and response to surround (A, C) |
1° | 88 | 48 (54.5%) | 57 (64.8%) | 82 (93.2%) | 48 (54.5%) |
2° | 97 | 26 (26.8%) | 32 (33%) | 81 (83.5%) | 22 (22.7%) |
3° | 97 | 19 (19.6%) | 21 (21.6%) | 54 (55.6%) | 15 (15.5%) |
4° | 88 | 6 (6.8%) | 3 (3.4%) | 38 (43.2%) | 3 (3.4%) |
5° | 71 | 3 (4.2%) | 4 (5.6%) | 32 (45.1%) | 2 (2.8%) |
8° | 23 | 0 | 0 | 8 (34.8%) | 0 |
12° | 23 | 0 | 0 | 7 (30.4%) | 0 |
Columns A and B show the number of neurons that had modulation index values significantly >1.0 (p < 0.05, 1-tailedt test) for the orientation-defined figure and the figure-alone configurations, respectively. Column C shows the number of neurons that gave a significant response to the surround texture alone, relative to the spontaneous firing rate of the neuron (determined by the statistical criteria used for calculating the response latency; see Materials and Methods). Column D contains the number of neurons that exhibited both contextual modulation to the orientation-defined figure and a significant response to the surround texture when presented alone.