Figure 6.
Tuning of the aftereffect to heading orientation. A, Orientation tuning of the aftereffect was studied by adapting observers (n = 9) to one of three frontward-facing walkers in separate blocked trials (see Materials and Methods). The test stimulus was always the same bistable PL walker (30° left/150° left). B, Backward percept ratio measures for each observer. The horizontal dashed line indicates a postadapt/control ratio of 1 (i.e., no adaptation). Analyses revealed a strong effect of adaptor type (F(2,16) = 94.6; p < 10−9). Post hoc tests confirmed that the aftereffect fell off significantly from the 30°L to 0° adaptors (t(8) = 7.4; p < 0.0001), and from 0° to 30°R adaptors (t(8) = 5.9; p < 0.0005).