The strong connection between sensory and cognitive performance in old age: Not due to sensory acuity reductions operating during cognitive assessment.

Lindenberger, Ulman; Scherer, Hans; Baltes, Paul B. · 2001 · OpenAlex-citations

DOI: 10.1037/0882-7974.16.2.196

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Summary

This study investigates the strong correlation between sensory decline and cognitive impairment in old age, specifically testing the hypothesis that this link is an artifact of reduced sensory acuity during cognitive assessments. Previous research indicated that the covariation between sensory and intellectual functioning increases significantly with age, suggesting that older adults might perform poorly on cognitive tests simply because they cannot adequately perceive the stimuli, rather than due to genuine cognitive decline. To determine if sensory deficits operating during testing account for this phenomenon, the authors employed an age-simulation design, temporarily reducing the visual and auditory acuity of middle-aged adults to levels typical of older populations. The experiment involved 218 participants aged 30 to 50, randomly assigned to one of five conditions: effective reduction of both visual and auditory acuity, effective reduction of only one modality, placebo reductions, or no treatment. Visual acuity was lowered using partial occlusion filters, while auditory acuity was reduced using headphone-shaped noise protectors. The effectiveness of these manipulations was validated against data from the Berlin Aging Study, confirming that the induced sensory losses approximated or reached old-age levels. Participants completed a comprehensive cognitive battery assessing five intellectual abilities: perceptual speed, reasoning, episodic memory, verbal knowledge, and fluency, as well as working memory tasks. The results demonstrated that the experimental reductions in sensory acuity did not lower cognitive performance relative to control conditions. Statistical analyses revealed no significant main effects of sensory acuity manipulation on intellectual performance. In fact, participants in the no-treatment control group performed slightly worse on reasoning and knowledge tasks than those in the sensory-reduction groups, a finding attributed to potential practice effects or other non-sensory factors. The lack of detrimental effects on cognitive scores, despite verified sensory impairment, indicates that the strong sensory-cognitive connection observed in aging is not caused by immediate sensory input deficits during test administration. These findings reject the assessment-related sensory acuity account for the age-related increase in the sensory-cognitive link. The study concludes that the covariation between sensory and cognitive functioning in old age likely stems from deeper, common causes affecting brain integrity, such as general aspects of brain aging, rather than superficial difficulties in stimulus identification. This underscores the need to explore alternative explanations, such as the common-cause hypothesis, which posits that shared underlying mechanisms compromise both sensory and cognitive systems simultaneously.

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• age related perceptual decline