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Behavioural Science Section

Sensory and Cognitive Association in Older Persons: Findings from an Older Australian Population

Tay T.a · Wang J.J.a · Kifley A.a · Lindley R.b · Newall P.c · Mitchell P.a

Author affiliations

aCentre for Vision Research, Department of Ophthalmology, Westmead Millennium Institute, bDepartment of Geriatric Medicine, Western Clinical School, University of Sydney, and cDepartment of Linguistics, Macquarie University, Sydney, Australia

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Gerontology 2006;52:386–394

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Article / Publication Details

First-Page Preview
Abstract of Behavioural Science Section

Received: January 28, 2005
Accepted: June 29, 2006
Published online: October 31, 2006
Issue release date: October 2006

Number of Print Pages: 9
Number of Figures: 3
Number of Tables: 5

ISSN: 0304-324X (Print)
eISSN: 1423-0003 (Online)

For additional information: http://www.karger.com/GER

Abstract

Background: Explanations for associations found between sensory and cognitive function remain unclear. Objective: To assess in an older Australian population: (1) the correlation between sensory and cognitive function across groups with a narrow age range; (2) any independent association between sensory and cognitive impairment. Methods: We examined 3,509 non-institutionalised residents aged 50+ years in the second cross-sectional survey of the Blue Mountains Eye Study (1997–2000). Visual impairment was defined for best-corrected visual acuity (VA) <6/12 in the better eye, moderate to severe hearing loss for hearing threshold >40 dB (better ear), and likely cognitive impairment for Mini-Mental State Examination (MMSE) <24 points. Results: We found likely cognitive impairment in 3.3%, vision impairment in 2.7% and moderate to severe hearing loss in 10.5% of this population. Correlation between VA or hearing threshold and MMSE score increased with age. After adjusting for age, weak but significant correlation was evident in the normal ageing sample between vision and MMSE (r = 0.12 with vision items included and r = 0.11 with vision items excluded, both p < 0.0001), and between hearing thresholds and MMSE (r = –0.12, p < 0.0001). After adjusting for age, sex, education and history of stroke, persons with vision impairment had a lower mean MMSE score than those with normal vision, regardless of whether vision-related items were included (27.1 vs. 28.6, p < 0.001) or excluded (19.8 vs. 21.0, p < 0.001). Similarly, persons with moderate to severe hearing loss had a lower mean MMSE score than those without hearing loss (28.1 vs. 28.7, p < 0.001). Persons with likely cognitive impairment also had lower mean VA and higher mean hearing threshold than those without, after adjustment. Conclusions: We have documented an age-related correlation between sensory and cognitive function in a normal ageing sample. The association between sensory impairment and likely cognitive impairment remained significant after excluding vision-related MMSE items and adjusting for confounding factors. Our data suggest that age-related decline and the effect of visual impairment on the measurement of cognition only partly explain the association between sensory and cognitive impairments in older persons.

© 2006 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Behavioural Science Section

Received: January 28, 2005
Accepted: June 29, 2006
Published online: October 31, 2006
Issue release date: October 2006

Number of Print Pages: 9
Number of Figures: 3
Number of Tables: 5

ISSN: 0304-324X (Print)
eISSN: 1423-0003 (Online)

For additional information: http://www.karger.com/GER


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Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug.
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