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

Myrthe A. Plaisier, Irene A. Kuling, Eli Brenner, Jeroen B.J. Smeets*

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review


When lifting an object, it takes time to decide how heavy it is. How does this weight judgment develop? To answer this question, we examined when visual size information has to be present to induce a size-weight illusion. We found that a short glimpse (200 ms) of size information is sufficient to induce a size-weight illusion. The illusion occurred not only when the glimpse was before the onset of lifting but also when the object’s weight could already be felt. Only glimpses more than 300 ms after the onset of lifting did not influence the judged weight. This suggests that it takes about 300 ms to reach a perceptual decision about the weight.

Original languageEnglish
Pages (from-to)822–829
Number of pages8
JournalPsychological science
Issue number6
Early online date27 Mar 2019
Publication statusPublished - 1 Jun 2019


  • multisensory perception
  • perceptual decision making
  • size-weight illusion
  • time dependency


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