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Heads Up!

Jeffrey B Wagman1, Alex Dayer1, Alen Hajnal2

  • 11 Department of Psychology, Illinois State University, Normal, IL USA.

Experimental Psychology
|June 22, 2017
PubMed
Summary
This summary is machine-generated.

Perception of standing on inclined surfaces using tools shows negative hysteresis, meaning steeper angles are perceived when descending than ascending. This finding applies whether the tool is held or worn, suggesting flexible perceptual systems.

Keywords:
affordancesdynamical systems theoryhand-held objectshaptic perception

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Area of Science:

  • Cognitive Psychology
  • Perception Science
  • Dynamical Systems Theory

Background:

  • Behavioral affordances are perceived through interactions between anatomical components and external objects.
  • Perception of affordances, like standing on inclined surfaces, can involve tools held or worn by the individual.

Purpose of the Study:

  • To investigate if person-plus-object perceptual systems exhibit nonlinear phase transitions in affordance perception.
  • To compare the perception of standing affordances using a rod held versus attached to the head.

Main Methods:

  • Blindfolded participants explored inclined surfaces with a rod (hand-held or head-attached).
  • Participants reported perceived ability to stand on the surface.
  • Inclinations were presented in ascending and descending sequences.

Main Results:

  • Responses in both conditions demonstrated negative hysteresis.
  • Perceptual boundaries for standing were observed at steeper angles during descending sequences compared to ascending sequences.

Conclusions:

  • The generalization of negative hysteresis across different tool-use configurations supports a soft assembly of perceptual devices.
  • Findings align with a dynamical systems perspective on the perception of affordances.