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Tactile Semiautomatic Passive-Finger Angle Stimulator (TSPAS)

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Aging and the haptic perception of 3D surface shape.

J Farley Norman¹, Astrid M L Kappers, Amanda M Beers

¹Department of Psychology and Center for the Study of Lifespan Development, Western Kentucky University, Bowling Green, KY 42101-1030, USA. Farley.Norman@wku.edu

Attention, Perception & Psychophysics

|January 26, 2011

Summary

Older adults perceive three-dimensional (3D) surface shapes as accurately as younger adults using active touch (haptics). Despite reduced tactile sensitivity, age does not impair 3D shape perception from haptic exploration.

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Measurement of Vibration Detection Threshold and Tactile Spatial Acuity in Human Subjects

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Area of Science:

Neuroscience
Gerontology
Human-Computer Interaction

Background:

Aging is associated with declines in sensory functions, including tactile sensitivity and acuity.
Understanding how these changes impact sensorimotor performance in older adults is crucial for maintaining independence and quality of life.

Purpose of the Study:

To investigate age-related differences in the perception of three-dimensional (3D) object surface shapes using active touch (haptics).
To determine if older adults can reliably perceive 3D surface geometry from haptic exploration, similar to younger adults.

Main Methods:

Two experiments were conducted with older (64-84 years) and younger (18-27 years) adults.
Participants haptically explored large (20 cm) and small (5 cm) surfaces varying in shape index (-1.0 to +1.0).
Judgments of surface shape were assessed using entire hand (Experiment 1) and single finger (Experiment 2) exploration.

Main Results:

Both older and younger adults reliably judged the 3D shape of haptic surfaces.
Older participants' shape judgments were as accurate and precise as those of younger participants.
Performance was consistent across both large and small surfaces, and across different exploration methods.

Conclusions:

Older adults effectively perceive 3D surface shapes from haptic exploration, despite age-related declines in tactile sensitivity.
Haptic perception of 3D surface geometry remains largely intact in older adulthood.
These findings highlight the resilience of the haptic system in older individuals for object shape understanding.