Figure 1.
Experimental protocol. A, In both experiments, subjects were adapted to |1:6|. Adaptation stimuli included a wide range of numerators and denominators. After adaptation, stimuli deviating in proportion (deviants) were intermingled with the adaptation stimuli at irregular intervals. Two distinct notations were used for the deviants. In the first experiment, deviants were |2:6|, |3:6|, |4:6|, and |5:6| (fraction numerals). They were presented with denominators 6 or 12 (using the numerators of the adaptation phase) and colored red or blue (three-factorial design). In the second experiment, deviants were the German words for one-sixth, one-fourth, one-third, and one-half (fraction words). The terms for between, during, along, and after were used as controls. B, Example images for both experiments.