Rate Discrimination Training May Partially Restore Temporal Processing Abilities from Age-Related Deficits

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Cognitive Neuroscience

Background:

• Age-related hearing difficulties often stem from impaired temporal processing, impacting speech comprehension in noisy environments.
• Understanding speech in complex settings relies on the brain's precise processing of speech signal timing.

Purpose of the Study:

• To investigate the impact of rate discrimination training on auditory temporal processing in different age and hearing groups.
• To assess if auditory training can mitigate age-related declines in temporal processing.

Main Methods:

• A double-blind, randomized control study with 77 participants (young normal-hearing, older normal-hearing, older hearing-impaired).
• Experimental group received rate discrimination training; active control group performed tone detection.
• Pre- and post-training assessments included perceptual rate discrimination and auditory steady-state responses (ASSRs) to pulse trains.

Main Results:

• Significant improvements in perceptual and ASSR measures at trained frequencies (100 and 300 Hz) for the experimental group compared to the control.
• Older listeners' post-training performance matched younger listeners' pre-training levels.
• Training benefits generalized to untrained frequencies (200 and 400 Hz) and correlated with improved recognition of reverberant speech.

Conclusions:

• Auditory training can partially restore age-related deficits in temporal processing.
• Cognitive functions, specifically attention, are linked to improvements in auditory training outcomes.
• These findings suggest a potential for auditory interventions to enhance communication abilities in older adults.