Responses to the distractor stimuli.

<p>Each plot shows the distribution of response angles (dots) and the angle and length of the mean vector (arrow) corresponding to the angles at which subjects (maximum possible n = 20 per plot) first touched the wall of the circular test arena relative to the playback speaker positioned at 0°. The text insets show the proportion of subjects that met the response criterion of touching the arena wall during 5 min (k), the length of the mean vector (r), and the results of a Rayleigh test (Z and p) of the null hypothesis that the data are uniformly distributed. Data are shown for the three reference trials tested at the beginning, middle, and end of a sequence of test trials (top row; 1 dot = 2 subjects), for each of the distractor stimuli (middle rows; 1.093 kHz through 3.092 kHz; 1 dot = 1 subject), and for subjects tested in the main source segregation experiment in response to the unimodal target stimuli with carrier frequencies of 1.3 kHz or 2.6 kHz presented alone with no distractors (bottom row; 1 dot = 1 subject).