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Journal of Speech, Language, and Hearing Research Vol.45 1285-1296 December 2002. doi:10.1044/1092-4388(2002/103)
© American Speech-Language-Hearing Association
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Temporal Integration of Sinusoidal Increments in the Absence of Absolute Energy Cues

C. Formby 1
M. G. Heinz 2

I. V. Aleksandrovsky 1
1 Division of Otolaryngology—HNS University of Maryland School of Medicine Baltimore
2 Speech and Hearing Sciences Program Massachusetts Institute of Technology Cambridge

cformby{at}smail.umaryland.edu

Classical temporal integration (TI) is often viewed as a frequency-dependent, energy-based detection process. Detection thresholds for brief sinusoidal increments in either a fixed-level or a random-level broadband pedestal are reported that refute this traditional perspective of TI. Instead, evidence is presented that indicates (a) detection of absolute energy is not necessary for the TI effect and (b) the frequency dependence of TI is consistent with variations across frequency in peripheral auditory tuning, rather than the integration process per se. When peripheral frequency selectivity is controlled, TI can be explained by a frequencyinvariant integration process over at least the frequency range from 500 to 4000 Hz. This process is characterized by threshold improvements of 8–9 dB per decade increase in duration for increment durations between 10 and 300 ms.

KEY WORDS: temporal integration, energy detection, increment detection, roving-level paradigm, masked detection

Submitted on April 12, 2001
Accepted on April 9, 2002


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