Abstract
The purpose of this study was to investigate the effect of symmetrical, asymmetrical and unilateral hearing impairment on music quality perception. Six validated music pieces in the categories of classical music, folk music and pop music were used to assess music quality in terms of its 'pleasantness', 'naturalness', 'fullness', 'roughness' and 'sharpness'. 58 participants with sensorineural hearing loss [20 with unilateral hearing loss (UHL), 20 with bilateral symmetrical hearing loss (BSHL) and 18 with bilateral asymmetrical hearing loss (BAHL)] and 29 normal hearing (NH) subjects participated in the present study. Hearing impaired (HI) participants had greater difficulty in overall music quality perception than NH participants. Participants with BSHL rated music pleasantness and naturalness to be higher than participants with BAHL. Moreover, the hearing thresholds of the better ears from BSHL and BAHL participants as well as the hearing thresholds of the worse ears from BSHL participants were negatively correlated to the pleasantness and naturalness perception. HI participants rated the familiar music pieces higher than unfamiliar music pieces in the three music categories. Music quality perception in participants with hearing impairment appeared to be affected by symmetry of hearing loss, degree of hearing loss and music familiarity when they were assessed using the music quality rating test (MQRT). This indicates that binaural symmetrical hearing is important to achieve a high level of music quality perception in HI listeners. This emphasizes the importance of provision of bilateral hearing assistive devices for people with asymmetrical hearing impairment.
Highlights
People most often listen to music for their own enjoyment and music is generally expected to sound pleasant
The results indicated that music pleasantness and naturalness were negatively correlated with the pure tone average of both ears in bilateral symmetrical hearing loss (BSHL) and the better ear in bilateral asymmetrical hearing loss 22 (BAHL) listeners, which suggests that music quality perception is related to the degree of hearing loss of the better ear
Music quality perception in participants with hearing impairment appeared to be affected by degree of hearing loss, symmetry of hearing loss and music familiarity when they were assessed using the music quality rating test (MQRT)
Summary
People most often listen to music for their own enjoyment and music is generally expected to sound pleasant. Leek and Summers [11] reported that the pitch of complex sound or music was distorted for people with sensorineural hearing loss. This poor pitch perception was expected to be directly correlated to listeners‟ reduced frequency discrimination and selectivity abilities, which was attributed to broadened auditory filters. Another important factor is temporal resolution processing, which relies on both analysis and comparison of the time pattern within each frequency band and affects the pitch perception based on exact timing of neural synchrony firing. As a consequence of auditory filter and neural firing anomalies, poor frequency and temporal resolution, it is generally accepted that ability of music perception is affected in hearing-impaired (HI)
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