Temporal modulation transfer functions in cochlear implantees using a method that limits overall loudness cues
Matthew Fraser, Colette M McKay
Hearing Research | ELSEVIER SCIENCE BV | Published : 2012
Temporal modulation transfer functions (TMTFs) were measured for six users of cochlear implants, using different carrier rates and levels. Unlike most previous studies investigating modulation detection, the experimental design limited potential effects of overall loudness cues. Psychometric functions (percent correct discrimination of modulated from unmodulated stimuli versus modulation depth) were obtained. For each modulation depth, each modulated stimulus was loudness balanced to the unmodulated reference stimulus, and level jitter was applied in the discrimination task. The loudness-balance data showed that the modulated stimuli were louder than the unmodulated reference stimuli with th..View full abstract
Awarded by Medical Research Council
This study was supported by a project grant from the UK Medical Research Council. We thank Hugh McDermott for helpful comments on an earlier version of the manuscript, and three reviewers for constructive suggestions. We thank the six participants for the donation of their time to this research. The SPEAR processor was developed at the Cooperative Research Centre for Hearing in Melbourne, Australia, and the ImPReS software was developed at the University of Melbourne, Australia, with support from the MRC Cognition and Brain Sciences Unit in Cambridge, UK.