Dissociable effects of stimulus range on perception and action

Gal Namdar, Daniel Algom, Tzvi Ganel

Research output: Contribution to journalArticlepeer-review

Abstract

We have recently reported the discovery that the ability to detect a minimum increment to a stimulus depends on the spread of the other stimuli for which this just noticeable difference (JND) is being measured (Namdar, Ganel, & Algom, 2016). In particular, the JND around a standard stimulus was larger when the other standards tested within the same experimental session spread a larger range. In this study we show that this range of standards effect (RSE) is limited to perceptual estimations and does not extend to action. The JND remained invariant when the participants grasped the objects rather than perceptually estimated their size. This difference supports the hypothesis that visual perception, on the one hand, and visually controlled action, on the other hand, are governed by separate rules and mediated by different mechanisms.

Original languageEnglish
Pages (from-to)28-33
Number of pages6
JournalCortex
Volume98
DOIs
StatePublished - Jan 2018

Keywords

  • Effects of context
  • Grasping
  • Perception and action
  • Psychophysics
  • Relative processing

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