Discrimination of first- and second-order regular intervals from random intervals as a function of high-pass filter cutoff frequency.

This study extends the work of Kaernbach and Demany @J. Acoust. Soc. Am. 104, 2998–2306 ~1998!# in which regular interval stimuli ~RIS! click trains with first-order intervals could be discriminated from random-interval click trains, but RIS with second-order intervals could not. Kaernbach and Demany concluded that their results cast doubt on autocorrelation as a method of analysis for such stimuli. The present study investigated the same stimuli, but for a variety of filter conditions. The results suggest that while RIS click trains with first-order intervals are more easily discriminated from random-interval stimuli than second-order interval RIS click trains, discrimination based on second-order intervals is possible except when the stimuli are high-pass filtered above 8 kHz, i.e., above the spectral region of phase locking. © 2005 Acoustical Society of America. @DOI: 10.1121/1.1830671#