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Does task relevance shape the 'shift to global' in ambiguous motion perception?

Charlotte Boeykens1, Johan Wagemans1, Pieter Moors1

  • 1Laboratory of Experimental Psychology, Department of Brain and Cognition, KU Leuven, Belgium.

Journal of Vision
|January 17, 2019
PubMed
Summary
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Visual perception can shift towards a "global" interpretation with prolonged exposure. However, this study found that making the global percept relevant in an auxiliary task did not influence this perceptual shift.

Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Visual Perception

Background:

  • Perceptual experience and relevance significantly impact visual perception.
  • Ambiguous stimuli can lead to shifts in perception over time.
  • The role of perceptual relevance versus mere exposure in these shifts remains unclear.

Purpose of the Study:

  • To investigate the influence of perceptual relevance in an auxiliary task on the perception of an ambiguous motion stimulus.
  • To determine if making a specific percept (local or global) relevant affects the characteristic "shift to global" observed with prolonged exposure.

Main Methods:

  • Participants viewed an ambiguous motion stimulus (local vs. global percepts).
  • A 5-day relevance learning phase assigned participants to conditions: local, global, or no relevance in an auxiliary task.

Related Experiment Videos

  • Pre- and posttests measured points of subjective equality between local and global percepts.

    • Main Results:

    • A significant "shift to global" perception was observed with prolonged stimulus exposure.
    • The relevance assigned to the global percept in the auxiliary task did not alter the magnitude or occurrence of this shift.

    Conclusions:

    • Prolonged exposure to ambiguous stimuli drives a shift towards global perception.
    • Perceptual relevance in an auxiliary task does not appear to modulate this exposure-driven perceptual shift.