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. 2009 Jun;21(4):547-66.
doi: 10.1177/0898264309333326.

Visual function and cognitive speed of processing mediate age-related decline in memory span and fluid intelligence

Olivio J Clay  1 , Jerri D Edwards, Lesley A Ross, Ozioma Okonkwo, Virginia G Wadley, David L Roth, Karlene K Ball
Affiliations

Visual function and cognitive speed of processing mediate age-related decline in memory span and fluid intelligence

Olivio J Clay et al. J Aging Health. 2009 Jun.

Abstract

Objective: To evaluate the relationship between sensory and cognitive decline, particularly with respect to speed of processing, memory span, and fluid intelligence. In addition, the common cause, sensory degradation and speed of processing hypotheses were compared.

Method: Structural equation modeling was used to investigate the complex relationships among age-related decrements in these areas.

Results: Cross-sectional data analyses included 842 older adult participants (M = 73 years). After accounting for age-related declines in vision and processing speed, the direct associations between age and memory span and between age and fluid intelligence were nonsignificant. Older age was associated with visual decline, which was associated with slower speed of processing, which in turn was associated with greater cognitive deficits.

Discussion: The findings support both the sensory degradation and speed of processing accounts of age-related, cognitive decline. Furthermore, the findings highlight positive aspects of normal cognitive aging in that older age may not be associated with a loss of fluid intelligence if visual sensory functioning and processing speed can be maintained.

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Figures

Figure 1
Figure 1
Four-Factor Measurement Model for Sensory Functioning, Processing Speed, Memory Span and Fluid Intelligence
Figure 2
Figure 2
Full Structural/Mediation Model with All Tested Paths Note: FVA = far visual acuity; CS = contrast sensitivity; Digit Sy = digit symbol substitution; Letter = letter comparison; Pattern = pattern comparison; UFOV = useful field of view; Digit = digit span; Spat = spatial span; Matrix Reason = matrix reasoning;
Figure 3
Figure 3
Trimmed Structural/Mediation Model with Significant Paths Note: FVA = far visual acuity; CS = contrast sensitivity; Digit Sy = digit symbol substitution; Letter = letter comparison; Pattern = pattern comparison; UFOV = useful field of view; Digit = digit span; Spat = spatial span; Matrix Reason = matrix reasoning;
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