Visual abilities in older adults explain age-differences in stroop and fluid intelligence but not face recognition: Implications for the vision-cognition connection

The associations among age, visual abilities and cognitive abilities were investigated using structural equation modeling. Measures of Visual Acuity, Colour Vision, Contrast Sensitivity, Stroop, Face Recognition and Fluid intelligence (Gf) were administered to a volunteer sample (n = 90) aged 60-87. Visual Acuity was associated with Gf even after controlling for chronological age. Age differences in Stroop were explained entirely by Colour Vision performance. However, neither Visual Acuity nor Colour Vision explained age-differences in Face Recognition. The results show that performance on some neuropsychological tests is influenced by visual ability and challenge the conventional identification of ageing effects on the Stroop task with deficits in frontal executive functioning. Visual abilities do not, however, contribute to age-differences in all cognitive domains suggesting that sensory and cognitive performance declines are not necessarily due to common biological ageing processes.