title: Interactions between amplitude modulation and frequency modulation processing: Effects of age and hearing loss.
abstract: Frequency modulation (FM) and amplitude modulation (AM) detection thresholds were measured for a 500-Hz carrier frequency and a 5-Hz modulation rate. For AM detection, FM at the same rate as the AM was superimposed with varying FM depth. For FM detection, AM at the same rate was superimposed with varying AM depth. The target stimuli always contained both amplitude and frequency modulations, while the standard stimuli only contained the interfering modulation. Young and older normal-hearing listeners, as well as older listeners with mild-to-moderate sensorineural hearing loss were tested. For all groups, AM and FM detection thresholds were degraded in the presence of the interfering modulation. AM detection with and without interfering FM was hardly affected by either age or hearing loss. While aging had an overall detrimental effect on FM detection with and without interfering AM, there was a trend that hearing loss further impaired FM detection in the presence of AM. Several models using optimal combination of temporal-envelope cues at the outputs of off-frequency filters were tested. The interfering effects could only be predicted for hearing-impaired listeners. This indirectly supports the idea that, in addition to envelope cues resulting from FM-to-AM conversion, normal-hearing listeners use temporal fine-structure cues for FM detection.
authors.affiliation: Laboratoire des Systèmes Perceptifs (CNRS UMR 8248), Institut d'Etude de la Cognition, Ecole normale supérieure, Paris Sciences et Lettres Research University, 29 rue d'Ulm, 75005 Paris, France.
authors.forename: Nihaad
authors.initials: N
authors.lastname: Paraouty
authors.affiliation: Medizinische Physik and Cluster of Excellence Hearing4All, Universität Oldenburg, 26111 Oldenburg, Germany.
authors.forename: Stephan D
authors.initials: SD
authors.lastname: Ewert
authors.affiliation: Laboratoire des Systèmes Perceptifs (CNRS UMR 8248), Institut d'Etude de la Cognition, Ecole normale supérieure, Paris Sciences et Lettres Research University, 29 rue d'Ulm, 75005 Paris, France.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Wallaert
authors.affiliation: Laboratoire des Systèmes Perceptifs (CNRS UMR 8248), Institut d'Etude de la Cognition, Ecole normale supérieure, Paris Sciences et Lettres Research University, 29 rue d'Ulm, 75005 Paris, France.
authors.forename: Christian
authors.initials: C
authors.lastname: Lorenzi
mesh_terms: D000328:Adult; D000367:Age Factors; D001309:Auditory Threshold / Q000502:physiology*; D003051:Cochlea / Q000502:physiology*; D003463:Cues; D034381:Hearing Loss / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D013061:Speech Acoustics; D013068:Speech Production Measurement; D055815:Young Adult