Auditory temporal processing in healthy aging: a magnetoencephalographic study
TL;DR: Significantly larger amplitudes of the P1m and N1m waves suggest that the cortical processing of individual sounds differs between younger and older individuals, adding to the growing evidence that brain functions, such as sensory processing, motor control and cognitive processing, can change during healthy aging.
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Abstract: Impaired speech perception is one of the major sequelae of aging. In addition to peripheral hearing loss, central deficits of auditory processing are supposed to contribute to the deterioration of speech perception in older individuals. To test the hypothesis that auditory temporal processing is compromised in aging, auditory evoked magnetic fields were recorded during stimulation with sequences of 4 rapidly recurring speech sounds in 28 healthy individuals aged 20 – 78 years. The decrement of the N1m amplitude during rapid auditory stimulation was not significantly different between older and younger adults. The amplitudes of the middle-latency P1m wave and of the long-latency N1m, however, were significantly larger in older than in younger participants. The results of the present study do not provide evidence for the hypothesis that auditory temporal processing, as measured by the decrement (short-term habituation) of the major auditory evoked component, the N1m wave, is impaired in aging. The differences between these magnetoencephalographic findings and previously published behavioral data might be explained by differences in the experimental setting between the present study and previous behavioral studies, in terms of speech rate, attention, and masking noise. Significantly larger amplitudes of the P1m and N1m waves suggest that the cortical processing of individual sounds differs between younger and older individuals. This result adds to the growing evidence that brain functions, such as sensory processing, motor control and cognitive processing, can change during healthy aging, presumably due to experience-dependent neuroplastic mechanisms.
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Citations
Evidence of degraded representation of speech in noise, in the aging midbrain and cortex
TL;DR: Midbrain frequency following responses to a speech syllable are more degraded in noise in older adults than in younger adults, suggesting a failure of the midbrain auditory mechanisms needed to compensate for the presence of a competing talker.
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Speech-in-noise representation in the aging midbrain and cortex: Effects of hearing loss.
TL;DR: The overall paucity of differences in midbrain or cortical responses between the two older groups suggests that age-related temporal processing deficits may contribute to older adults’ communication difficulties beyond what might be predicted from peripheral hearing loss alone; however, hearing loss does seem to alter the connectivity between midbrain and cortex.
Effect of informational content of noise on speech representation in the aging midbrain and cortex.
TL;DR: The results suggest that neural processing is strongly affected by the informational content of noise, and older listeners' cortical responses to the attended speech signal are less deteriorated when the competing speech signal is an incomprehensible language rather than when it is their native language.
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Evidence for enhanced neural tracking of the speech envelope underlying age-related speech-in-noise difficulties.
TL;DR: The results support the hypothesis that enhanced envelope tracking in older adults is the result of a higher activation of brain regions for processing speech, compared to younger adults.
110
Effects of age-related hearing loss and background noise on neuromagnetic activity from auditory cortex.
TL;DR: The results revealed that similar noise-induced increases in N1m were present in older adults with and without hearing loss and showed that the P1m amplitude was larger in the hearing impaired than in the normal-hearing adults.
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Risto Näätänen,Terence W. Picton +1 more
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