title: Dissociable effects of stimulus range on perception and action.
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.
authors.affiliation: Department of Psychology, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
authors.forename: Gal
authors.initials: G
authors.lastname: Namdar
authors.affiliation: School of Psychological Sciences, Tel-Aviv University, Tel-Aviv, Israel.
authors.forename: Daniel
authors.initials: D
authors.lastname: Algom
authors.affiliation: Department of Psychology, Ben-Gurion University of the Negev, Beer-Sheva, Israel. Electronic address: tganel@bgu.ac.il.
authors.forename: Tzvi
authors.initials: T
authors.lastname: Ganel
mesh_terms: D000328:Adult; D001696:Biomechanical Phenomena / Q000502:physiology; D004192:Discrimination, Psychological / Q000502:physiology; D005260:Female; D018737:Hand Strength / Q000502:physiology*; D006801:Humans; D008297:Male; D011597:Psychomotor Performance / Q000502:physiology*; D014796:Visual Perception / Q000502:physiology*; D055815:Young Adult
keywords: Effects of context; Grasping; Perception and action; Psychophysics; Relative processing