Figure 2.

Experiment 1 results. (A) Objective stage: Deviant sensitivity (d′) for four-semitone (black bars) and eight-semitone (white bars) frequency separations. There were three deviant positions in attend condition and one the switch condition. Error bars show ±1 SE of the mean, with across-participant variance removed. (B) Subjective stage: Proportion of segregated reports for four-semitone (filled symbols) and eight-semitone (empty symbols) frequency separations. Squares indicate reports in the attend condition. Reports in the switch condition are plotted at the actual time they occurred (triangles) and replotted at the start of the sequence (circles) for ease of comparison to the attend condition. The dotted line shows the time at which participants were instructed to switch attention from the noises to the tones in the switch condition. Arrows below the abscissa indicate the mean times at which early, middle and late deviants occurred.