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Cognitive Hearing Science: Three Memory Systems, Two Approaches, and the Ease of Language Understanding Model
Jerker Rönnberg1, Emil Holmer1, Mary Rudner1
1Linnaeus Centre HEAD, Swedish Institute for Disability Research Department of Behavioural Sciences and Learning, Linköping University, Sweden.
Journal of Speech, Language, and Hearing Research : JSLHR
|January 13, 2021
Summary
Hearing loss may impair language understanding by occupying working memory (WM), leading to disuse of long-term memory (LTM) systems. This disuse could link hearing loss to dementia risk.
Area of Science:
- Cognitive Science
- Neuroscience
- Audiology
Background:
- Understanding language involves a balance between processing input and predicting upcoming information.
- When comprehension fails, the brain reconstructs meaning.
- Three memory systems are crucial: working memory (WM), episodic long-term memory (ELTM), and semantic long-term memory (SLTM).
Purpose of the Study:
- To conceptualize the interplay between language input and prediction in achieving understanding.
- To investigate the role of WM, ELTM, and SLTM in language comprehension.
- To examine the effects of age-related hearing loss on these memory systems within the Ease of Language Understanding (ELU) model.
Main Methods:
- The Ease of Language Understanding (ELU) model posits that mismatches between auditory input and long-term memory (LTM) representations engage WM.
- Experimental manipulations involved signal processing in hearing aids and background noise to induce mismatches.
- The primary approach reviewed the impact of age-related hearing loss on WM, ELTM, and SLTM.
Main Results:
- Mismatches between auditory input and LTM representations increase reliance on WM.
- Age-related hearing loss is predicted to increase WM load for reconstructing auditory input.
- This increased WM load may lead to reduced utilization and potential disuse of ELTM and SLTM.
Conclusions:
- Reduced utilization of ELTM and SLTM due to hearing loss-induced WM demands could be significant.
- ELTM decline is linked to dementia precursors.
- Hearing loss-related ELTM disuse may contribute to the causal pathway between hearing loss and increased dementia risk, including Alzheimer's disease.
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