Table 2.
Fitting parameters to quantify the influence of the context bar and the influence of attention on orientation discrimination
| High contrast |
Medium contrast |
Low contrast |
||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Subject |
n
|
g
|
Subject |
n
|
g
|
Subject |
n
|
g
|
||||||
| Single task | Dual task | Single task | Dual task | Single task | Dual task | Single task | Dual task | Single task | Dual task | Single task | Dual task | |||
| KW | 0.22 | 9.45 | -0.43 | -0.77 | CP | 1.24 | 0.15 | -0.22 | -0.21 | MR | 0.97 | 12.85 | -0.02 | 0.07 |
| WS | 22.61 | 16.12 | -0.10 | -0.59 | DC | 0.31 | 3.99 | -0.33 | -1.04 | NT | 4.70 | 5.67 | -0.09 | 0.57 |
| CS | 12.20 | 0.14 | -0.12 | -0.43 | SJH | 0.12 | 0.56 | -0.27 | -0.54 | YL | 9.11 | 7.91 | 0.26 | 0.21 |
| DB | 13.37 | 7.61 | -0.24 | -0.25 | TE | 0.05 | 1.01 | -0.43 | -0.46 | ZI | 5.65 | 5.59 | 0.22 | 0.36 |
| AT | 19.38 | 0.52 | -0.22 | -0.35 | EA | 8.26 | 1.31 | 0.31 | 0.34 | |||||
| AG | 12.39 | 6.92 | -0.32 | -0.45 | IS | 8.42 | 3.42 | 0.06 | 0.33 | |||||
| DH | 0.21 | 5.59 | -0.34 | -0.34 | ER | 5.48 | 5.15 | 0.54 | 0.78 | |||||
| JS | 0.18 | 0.14 | -0.30 | -0.74 | ||||||||||
| NT | 4.36 | 0.34 | 0.00 | -0.08 | ||||||||||
| YL | 12.33 | 6.98 | -0.17 | -0.07 | ||||||||||
| BP | 3.00 | 0.01 | -0.45 | -0.88 | ||||||||||
| PA | 5.57 | 0.31 | -0.28 | -0.37 | ||||||||||
| HS | 1.71 | 0.03 | -0.13 | -0.27 | ||||||||||
| Median | 5.57 | 0.52 | -0.24 | -0.37 | Median | 0.21 | 0.78 | -0.30 | -0.50 | Median | 5.65 | 5.59 | 0.22 | 0.34 |
| 25th | 1.71 | 0.14 | -0.32 | -0.59 | 25th | 0.10 | 0.45 | -0.35 | -0.67 | 25th | 5.09 | 4.29 | 0.02 | 0.27 |
| 75th | 12.39 | 6.98 | -0.13 | -0.27 | 75th | 0.54 | 1.75 | -0.26 | -0.40 | 75th | 8.34 | 6.79 | 0.29 | 0.46 |
| SRT | P = 0.06 | P = 0.002 | SRT | P = 0.63 | P = 0.25 | SRT | P = 0.58 | P = 0.047 | ||||||
| SRT | P = 0.06 | P < 0.0001 | ||||||||||||
| Comp | ||||||||||||||
Parameters were obtained by fitting a tilted 3D surface to the data (for details see “Results” and “Methods”). The parameter “n” corresponds to the slope of the surface along the target-to-reference axis and so relates to the reliability of the response. The parameter “g” corresponds to the gradient of the surface along the target-to-context bar axis and so relates to the effect of the context bar on the perceived target orientation. Lower rows give the median, 25th and 75th percentiles over the population. P-values indicate whether a significant difference for the parameter of interest occurred between single and dual task for each contrast condition separately (signed rank test SRT) and for all contrasts combined (SRT Comb.)