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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
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Tactile Semiautomatic Passive-Finger Angle Stimulator TSPAS
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Size Constancy Mechanisms: Empirical Evidence from Touch.

Luigi Tamè1,2, Suzuki Limbu2, Rebecca Harlow2

  • 1School of Psychology, University of Kent, Canterbury CT2 7NP, UK.

Vision (Basel, Switzerland)
|July 27, 2022
PubMed
Summary

Tactile perception shows bias, with distances across the hand feeling larger than along it. This anisotropy is reduced when judging continuous object sizes, suggesting effective tactile size constancy for objects.

Keywords:
anisotropybody representationsconstancydistancesizetouch

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Area of Science:

  • Neuroscience
  • Somatosensation
  • Perception

Background:

  • Tactile distance perception exhibits significant anisotropy across body parts, notably the hand.
  • This phenomenon, where mediolateral distances feel larger than proximodistal ones, is partly linked to somatosensory cortex organization but also involves tactile size constancy.

Purpose of the Study:

  • To investigate if tactile anisotropy observed in distance judgments extends to the perception of continuous object sizes.
  • To determine if tactile size constancy mechanisms differ between estimating distances and object sizes.

Main Methods:

  • Participants judged the relative size of tactile stimuli on their hand dorsum.
  • Stimuli were presented in blocks, comparing either two distinct tactile distances or two continuous object lengths.
  • Stimulations were oriented along the proximodistal (along the hand) and mediolateral (across the hand) axes.

Main Results:

  • A significant anisotropy was confirmed for tactile distance perception, with across-hand distances perceived as larger than along-hand distances.
  • Critically, this anisotropy was substantially reduced or absent when participants judged the size of continuous objects.
  • This indicates a difference in perceptual compensation between distance and object size judgments.

Conclusions:

  • Tactile size constancy mechanisms are more effective in compensating for perceptual biases when estimating the size of continuous objects compared to distances between two points.
  • A lateral inhibition mechanism, influenced by the receptive field's shape during object contact, may underpin this enhanced tactile size compensation.