highly significantp<0.005
Centroid estimates drifted exponentially towards higher values ( Fig 5E ) matching closely the estimated modulation content of the stimulus (indicated by orange shading, see Materials and Methods and S5 Fig ), and this effect was surprisingly robust across listeners: even though drift (see Materials and Methods for definition) returned a noisy measurement for individual listeners (see 95% confidence intervals in Fig 5F ), it was consistently positive (symbols fall to the right of vertical line in Fig 5F ) so that the overall trend across listeners was highly significant (p<0.005).