Violations of Weber's law tell us more about methodological challenges in sensorimotor research than about the neural correlates of visual behaviour

Thomas Schenk, Kathrin S Utz, Constanze Hesse

Research output: Contribution to journalComment/debate

5 Citations (Scopus)

Abstract

The violation of Weber’s law in grasping has been presented as evidence for the claim that grasping is guided by visual information which is distinct from the information used in perceptual tasks. Previously, we contested this claim and argued that biomechanical constraints of the hand might explain why Weber’s law cannot be reliably uncovered in grasping movements. In a recent article Manzone and colleagues (2017) show that pantomime grasping follows Weber’s law even with objects whose width is close to the hand’s biomechanical limit. In this commentary we explain why the biomechanical account does not necessarily predict the violation of Weber’s law in a pantomime grasping task and why it seems problematic to use adherence or violation of Weber’s law as a criterion to assign tasks to different anatomical pathways.
Original languageEnglish
Pages (from-to)140-143
Number of pages4
JournalVision Research
Volume140
Early online date7 Oct 2017
DOIs
Publication statusPublished - Nov 2017

Keywords

  • action
  • perception
  • grasping
  • Weber's law
  • psychophysics
  • biomechanical

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