Speech and Hearing Science Commons^™

Gap detection was measured for two groups of normally hearing young adults using broad-band noise stimuli. Group I consisted of subjects who exhibitcd both strong spontaneous and click-evoked otoacoustic emissions (SOAEs and CEOAEs). Group II included individuals with no SOms in either ear and weak CEOAEs. An adaptive 2FC gap detection task was performed for the stimuli presented at either 10, 20, 30, or 50 dB SL. At 10 dB SL stimulus level, the ears in Group 1 exhibited greater intersubject variability and higher mean gap detection thresholds than those in Group ll. At higher SLs, there were no differences …

Four experiments are reported which examined the phenomenon of virtual pitch of missing fundamentals for complex tones with many harmonics. In particular the question is raised whether virtual pitch is mediated only by low-order harmonics, resolved in the cochlea, or can be conveyed as well by high-order harmonics which the cochlea cannot resolve. For a review of virtual pitch phenomena and asso~iated theories, see De Boer (1976), Moore (1982) or Scharf and Houtsma (1986).

Introduction: Within the last five years there has been a new interest in categorical-like perception of nonspeech signals. New investigations argued that categorical perception was questionable for both speech and nonspeech continua.One of the criteria of categorical perception says that subjects are able to discriminate only sounds that are identified as belonging to different categories.To examine if this criterion holds it should be known how large the differences in onset values of acoustic stimuli have to be in order to be perceptually different.Yet,surprisingly little is known about the difference limens /DLs/ of the rise time.Van Reuven and van den Broecke …