Fig. 4.

Second-report variability and orientation difference in the 2-line condition. (A) Second-report SD predicted by a sequential theory vs. the observation. The open dots and crosses are results for the 50° and 53° stimulus orientations, respectively. (B) The perceived orientation difference in the 2-line condition vs. that in the 1-line conditions for each subject. The red lines indicate the actual orientation difference of 3° between the 50° and 53° stimulus orientations. The orientation difference was exaggerated in the 2-line condition, but not in the 1-line conditions. deg, degrees.