Consistency of cells for border-ownership stimulia
| Paradigm | Significantly consistent | Significantly inconsistent | Not significant | |||
|---|---|---|---|---|---|---|
| All cells | Top 50 | All cells | Top 50 | All cells | Top 50 | |
| Standard test (single luminance square) | 55% (111/201) | 84% (42/50) | NA | NA | 44% (90/201) | 16% (8/50) |
| Occluding squares | 19% (21/110) | 30% (13/42) | 10% (11/110) | 2% (1/42) | 71% (78/110) | 67% (28/42) |
| Occluding outlines | 11% (12/111) | 17% (7/42) | 16% (18/111) | 5% (2/42) | 73% (81/111) | 79% (33/42) |
| C-shapes | 11% (12/108) | 19% (8/42) | 22% (24/108) | 10% (4/42) | 67% (72/108) | 71% (30/42) |
| Transparent | 20% (21/107) | 26% (11/42) | 5% (5/107) | 2% (1/42) | 76% (81/107) | 71% (30/42) |
| Four squares control | 37% (40/107) | 55% (23/42) | 10% (11/107) | 0% (0/42) | 52% (56/107) | 45% (19/42) |
| Single full faces | 41% (45/111) | 69% (29/42) | 17% (19/111) | 7% (3/42) | 42% (47/111) | 24% (10/42) |
| Occluding full faces | 14% (16/111) | 29% (12/42) | 5% (6/111) | 2% (1/42) | 80% (89/111) | 69% (29/42) |
| Single ambiguous face | 20% (22/111) | 29% (12/42) | 10% (11/111) | 0% (0/42) | 70% (78/111) | 71% (30/42) |
↵a For different stimuli presented during the experiment, we computed the percentage of cells that were significantly tuned to the side-of-figure of the stimulus and consistent with the preferred side-of-figure for the single luminance square. Significance criterion was p < 0.01 as in Zhou et al. (2000). For the single luminance square (first row), the proportion of significantly tuned cells merely indicates the proportion among all 201 analyzed cells, and among the 50 cells with highest average modulation index across artificial stimuli, respectively, that were significantly tuned the side-of-figure of the single luminance square by two-way ANOVA on side-of-figure and contrast polarity. For the remaining stimuli, we only considered cells that were significantly tuned to the side-of-figure of the single luminance square, which was the case for 111 of all 201 cells and 42 of the top 50 cells, and computed the proportions of cells from these two populations that were (1) significantly tuned to the side-of-figure of the stimulus and consistent with the side-of-figure preference for the single luminance square; (2) significantly tuned to the side-of-figure but inconsistent with the single luminance square; or (3) not significantly tuned to the side-of-figure of the given stimulus. Four of the 111 cells were lost too early to present all artificial stimuli. For comparison, Zhou et al. (2000) found that, among the cells that were significantly tuned the side-of-figure of the single luminance square, 20 of 42 cells were tuned significantly and consistent to the side-of-figure of occluding squares, 1 of 42 cells was tuned significantly but inconsistent, and 21 of 42 cells were not significantly tuned. For the C-shapes, Zhou et al. (2000) found 4 of 16 cells to be tuned significantly and consistent, 12 of 16 to be not significantly tuned, and no cells to be significantly tuned and inconsistent. For the transparent stimulus, Qiu and von der Heydt (2007) found 30 of 127 cells to be tuned significantly and consistent. The significance criterion was p < 0.05 in Qiu and von der Heydt (2007) and p < 0.01 in Zhou et al. (2000).