Reading focus
Syllabus: How Do We Adapt as We Grow Older?
Carry the first unit's caution about age differences into an older sample. Compare shared biological causes, consequences of sensory experience, and the cognitive demands of sensory tests.
A question to consider. What new measurement or intervention would distinguish two of these explanations without assuming that better hearing must improve every cognitive ability?
Why this reading
What does a strong association between sensory and cognitive performance explain? This study makes several possibilities visible: shared underlying changes, effects of sensory experience, and the demands of the measurements themselves.
Before you read
A latent factor summarizes what several measures share. Statistical mediation describes a pattern among variables; a well-fitting model does not by itself establish a causal process. Sensory tests also require attention and responses.
Read for
- Examine how vision, hearing, and cognitive abilities were assessed in the Berlin Aging Study.
- Compare the common-cause and sensory-deprivation explanations with the measurement alternatives.
- Follow the checks excluding participants with dementia or severe sensory impairment, and ask what those checks leave unresolved.
Consider afterwards
- How could a study distinguish a sensory aid improving access to a test from an improvement in the underlying ability the test is intended to measure?
Editorial context
The cross-sectional sample includes adults aged 70–103, with selective completion of a demanding assessment protocol. The authors explicitly leave the causal interpretation open. The later ACHIEVE randomized trial found no overall effect of its hearing intervention on three-year global cognitive change, with differing results by recruitment source. It does not resolve every explanation of the earlier association.