Study of a Signal-processing Algorithm Aiming at Improving Speech-in-noise Intelligibility in Normal-hearing and Hearing-impaired Persons

Inclusion criteria for normal-hearing participants : * consenting to and available for the study * age ≥ 18 years and ≤ 25 years * right-handed * native French speaker * pure-tone air-conduction audiometric thresholds at .5, 1, 2, and 4 kHz all ≤ 20 dB hearing loss (HL) Exclusion criteria for normal-hearing participants : * score at the Tinnitus Handicap Inventory \> 56 * uncorrected visual impairment * pregnancy * subject placed under legal authority (guardianship, tutorship) Inclusion criteria for hearing-impaired participants : * consenting to and available for the study * age ≥ 55 years * native French speaker * pure-tone air-conduction average hearing thresholds (PTA) for frequencies of .5, 1, 2, and 4 kHz ≥ 30 dB HL and ≤ 70 dB HL * right-ear PTA for low frequencies (\< 2 kHz) lower than the right-ear PTA for high frequencies (\> 4 kHz). The difference between the two PTAs must be ≥ 20 dB * the difference between the PTA for frequencies of .5, 1, 2, and 4 kHz (PTA.5-4kHz) in the right ear and the left-ear PTA.5-4kHz must be ≤ 10 dB Exclusion criteria for hearing-impaired participants : * score at the Tinnitus Handicap Inventory \> 56 * history of a hearing impairment that was left uncorrected for more than 10 years * uncorrected visual impairment * congenital hearing impairment * Ménière's disease * auditory neuropathy * mixed hearing loss * fluctuating hearing impairment * sudden hearing loss * hearing impairment concomitant with other symptoms (e.g. vertigo) * score at the Montreal Cognitive Assessment (MoCA) \< 27 * subject placed under legal authority (guardianship, tutorship)