Table 1.
Metrics of attentional modulation curves for low-contrast and high-contrast trials
| MAM | Cue MAM/Target MAM | Last frame at 75% MAM | |
|---|---|---|---|
| Low contrast | |||
| V1–V4 | 0.26 (0.07) | 0.87 (0.01) | 8.8 (0.2) |
| V1 | 0.14 (0.02) | 1.08 (0.06) | 6.3 (0.6) |
| V2 | 0.20 (0.05) | 0.98 (0.05) | 8.0 (0.4) |
| VP | 0.29 (0.08) | 0.81 (0.05) | 8.8 (0.5) |
| V4 | 0.32 (0.08) | 0.74 (0.06) | 8.8 (0.2) |
| V3A | 0.14 (0.05) | 0.98 (0.04) | 8.2 (0.2) |
| FEF | 0.06 (0.01) | 1.22 (0.07) | 6.7 (0.3) |
| IPS | 0.09 (0.03) | 1.35 (0.19) | 6.6 (1.2) |
| High contrast | |||
| V1–V4 | 0.19 (0.06) | 0.90 (0.09) | 8.7 (0.4) |
| V1 | 0.12 (0.02) | 0.96 (0.06) | 6.7 (0.6) |
| V2 | 0.16 (0.04) | 0.93 (0.09) | 8.2 (0.4) |
| VP | 0.19 (0.08) | 0.90 (0.16) | 7.8 (0.8) |
| V4 | 0.23 (0.06) | 0.74 (0.07) | 9.3 (0.3) |
| V3A | 0.11 (0.04) | 0.91 (0.05) | 7.8 (0.3) |
| FEF | 0.05 (0.01) | 1.22 (0.08) | 6.5 (0.3) |
| IPS | 0.08 (0.01) | 1.28 (0.39) | 5.4 (0.7) |
Metrics were computed separately for each subject and then averaged across subjects. For the ratio of cue to target MAM, the subjects with the highest and lowest ratios were excluded before averaging. Errors, in parentheses, are SEM. MAM, Maximal attentional modulation, the maximal difference (in % BOLD change) between attend-contralateral versus attend-ipsilateral trials, at any one time point over the course of the trial.