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When Does One Decide How Heavy an Object Feels While Picking It Up?

Myrthe A Plaisier1, Irene A Kuling1, Eli Brenner1

  • 1Department of Human Movement Sciences, Vrije Universiteit Amsterdam.

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Summary
This summary is machine-generated.

Visual size influences weight perception, even with brief exposure. This size-weight illusion develops within 300 milliseconds of lifting an object, impacting our judgment of heaviness.

Keywords:
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Area of Science:

  • Psychology
  • Perception Science
  • Human Motor Control

Background:

  • Weight judgment is crucial for safe and efficient object manipulation.
  • The size-weight illusion, where larger objects are perceived as lighter, demonstrates a complex interplay between visual and somatosensory information.
  • Understanding the temporal dynamics of this illusion offers insights into perceptual decision-making processes.

Purpose of the Study:

  • To determine the critical timing of visual size information required to elicit the size-weight illusion.
  • To investigate how early in the lifting process visual cues influence weight perception.
  • To establish the time window for perceptual decision-making during weight judgment.

Main Methods:

  • Participants performed lifting tasks with objects of varying sizes and weights.
  • Brief visual exposure (glimpses) to object size was manipulated at different time points relative to the onset of lifting.
  • Participants reported their perceived weight of the objects.

Main Results:

  • A brief visual glimpse of object size (200 ms) was sufficient to induce the size-weight illusion.
  • The illusion was observed even when visual information was presented after the lifting movement had begun.
  • Visual size information presented more than 300 ms after the onset of lifting did not affect the perceived weight.

Conclusions:

  • Visual size information significantly influences weight perception early in the lifting process.
  • The perceptual system integrates visual size cues within approximately 300 ms to form a weight judgment.
  • These findings provide critical temporal constraints on the mechanisms underlying the size-weight illusion and perceptual decision-making.