Hearing loss disrupts pitch via place, temporal, and interaural mechanisms.

Evidence

Historically, the effects of SNHL on pitch perception have often been attributed to deficits in the place model of pitch perception. This interpretation has been widely influenced by the view that phase locking does not depend strongly on level or with hearing loss (Harrison & Evans; 1979). However, modern psychophysical research suggests that there must be some deficit in the temporal code for listeners with hearing loss. Behavioral experimental evidence strongly supports the idea that listeners with SNHL have an altered representation of the temporal code (Hopkins & Moore, 2011). Modern physiological experiments, such as that by Heinz, Swaminathan, Boley, and Kale (2010), also find that acrossfrequency representations of neural synchrony are disrupted in the impaired auditory nerve. Consequently, the poor pitch perception of listeners with hearing loss may be due to disruptions to the temporal code, although further investigations are needed. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1334

Disruptions to the place code can occur because of poor frequency selectivity or an altered representation of the place of maximal stimulation on the basilar membrane. Distortions to the temporal code may also contribute to poor perception of pitch by listeners with hearing loss. Asymmetries in pitch representations across the ears can also be problematic, leading to diplacusis, and sloping or rising hearing loss could cause the pitch code to be contradictory at high versus low frequencies. In all, these deficits can have a great impact on the appreciation of music and in the perception of speech. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1337

Categorization

• XREF: Contradicts the textbook-standard assumption that SNHL pitch problems reflect broadened auditory filters; ties hearing-impaired to temporal coding literature from earlier chapters.
• corroborated: 2 independent passages support this claim — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1334; Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1337