Auditive and cognitive factors in speech perception by elderly listeners. II: Multivariate analyses

Area of Science:

• Audiology
• Gerontology
• Cognitive Science

Background:

• Speech perception declines with age, impacting quality of life for elderly individuals.
• Previous research established a test battery for auditory, cognitive, and speech perception abilities.

Purpose of the Study:

• To analyze speech perception test results in elderly subjects using multivariate statistics.
• To identify the independent components contributing to age-related speech perception decline.

Main Methods:

• Analysis of auditory, cognitive, and speech perception tests in 72 elderly subjects (aged 60-93).
• Application of multivariate statistical techniques to examine test result interdependencies.

Main Results:

• Speech perception deterioration comprises two independent components: high-frequency hearing loss (two-thirds of variance) and reduced cognitive efficiency (one-third of variance).
• High-frequency hearing loss is the primary driver of age-related speech perception decline.
• Cognitive factors, including memory and processing speed, also significantly contribute to reduced speech understanding.

Conclusions:

• Age-related speech perception decline is multifactorial, involving both auditory and cognitive decrements.
• The relative contribution of auditory versus cognitive factors to speech perception remains consistent across the adult lifespan.
• Understanding these components can inform interventions to improve speech perception in the elderly.