Reduced sensitivity for visual textures affects judgments of shape-from-shading and step-climbing behaviour in older adults.
Falls on stairs are a major hazard for older adults. Visual decline in normal ageing can affect step-climbing ability, altering gait and reducing toe clearance. Here we show that a loss of fine-grained visual information associated with age can affect the perception of surface undulations in patterned surfaces. We go on to show that such cues affect the limb trajectories of young adults, but due to their lack of sensitivity, not that of older adults. Interestingly neither the perceived height of a step nor conscious awareness is altered by our visual manipulation, but stepping behaviour is, suggesting that the influence of shape perception on stepping behaviour is via the unconscious, action-centred, dorsal visual pathway.
School of Psychology, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. a.j.schofield@bham.ac.uk.
Andrew J
AJ
Schofield
School of Sport, Exercise and Rehabilitation Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.
Benjamin
B
Curzon-Jones
Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, Byrom Street, Liverpool, L3 3AF, UK.
Mark A
MA
Hollands
D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D015350:Contrast Sensitivity / Q000502:physiology*; D005260:Female; D006801:Humans; D007600:Judgment / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D010775:Photic Stimulation; D013236:Stereognosis / Q000502:physiology*; D013499:Surface Properties; D055815:Young Adult
Shape-from-shading; Step climbing; Texture; Vision