Perceptual clustering in auditory streaming
Fig 6
a) Behavioural data and model simulations after fitting for four subjects, giving the fraction of trials in which the participant responded ‘2’ for the number of streams perceived.
Axes give the pitch difference for the middle tone and the inter stimulus interval (ISI): the time between the offset of one tone and the onset of the next. b) Model performance on experiment 1 in terms of Evidence Lower Bound (ELBO) for each subject with the CRP model (dark blue), alternative A (red), alternative B (yellow), and alternative C (purple). The black dotted line indicates the performance of a purely random model that assigns 0.5 probability to either response for every condition. Subjects are ordered based on CRP model ELBO values. In order to find a measure of the overall performance of the CRP model we calculated the average relative ELBO between random and perfect model fit (ELBOmin-ELBO)/ELBOmin). This average ELBO proportion is 0.419 for the CRP model, implying a good fit.