Neural gain changes subserving perceptual acuity.
When small and large objects of equal weight are lifted, the small object feels heavier than the large one (the size-weight illusion) and requires more effort to lift (the size-effort illusion). It has been suggested that these illusions result from neural gain changes designed to maintain acuity under different working conditions. If this suggestion is correct, a given mass should produce a larger increase in perceived weight or effort when added to the small object. This was found to be the case.
Jones
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LF
Department of Physiology, University of Utah School of Medicine, Salt Lake City 84108, USA.
Burgess
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PR
D000293:Adolescent; D000328:Adult; D005260:Female; D006801:Humans; D007088:Illusions / Q000502:physiology*; D008297:Male; D008875:Middle Aged; D005082:Physical Exertion / Q000502:physiology; D012858:Size Perception / Q000502:physiology*; D014892:Weight Perception / Q000502:physiology*