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Size, weight, and expectations.

Jeroen B J Smeets1, Kim Vos1, Emma Abbink1

  • 11190Vrije Universiteit Amsterdam, Amsterdam, The Netherlands.

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The size-weight illusion, where larger objects feel lighter, does not invert. Researchers found that unreliable visual size information did not lead to weight influencing size judgments, suggesting a specific mechanism for heaviness perception.

Keywords:
hapticssensory integrationvision

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Area of Science:

  • Psychology
  • Perception
  • Sensory Science

Background:

  • The size-weight illusion is a known phenomenon where perceived heaviness is influenced by object size.
  • Existing theories suggest this occurs because unreliable weight information leads to reliance on correlated size cues.

Purpose of the Study:

  • To investigate the potential existence of a reverse illusion: a weight-size illusion.
  • To determine if unreliable visual size information leads to weight influencing size perception.

Main Methods:

  • Participants lifted Styrofoam balls of varying sizes and weights in darkness.
  • A pulley system and glow-in-the-dark paint were used to manipulate and present stimuli.
  • Participants estimated object size using free magnitude estimation after lifting.

Main Results:

  • Visual size information was found to be unreliable, with distance affecting perceived size.
  • However, changes in object weight did not systematically affect size judgments.
  • Weight variations had a negligible (<0.5%) impact on perceived size.

Conclusions:

  • The absence of a weight-size illusion suggests that the mechanisms underlying the size-weight illusion are specific to heaviness perception.
  • The findings challenge explanations that propose a general principle of cross-modal cue reliance.