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Change detection for real-world objects in perihand space.

Stephen J Agauas1, Laura E Thomas2

  • 1Center for Visual and Cognitive Neuroscience, Department of Psychology, North Dakota State University, Fargo, ND, USA. stephen.agauas@ndsu.edu.

Attention, Perception & Psychophysics
|August 14, 2019
PubMed
Summary
This summary is machine-generated.

Visual processing near the hands is influenced by both hand posture and object properties. Grasp-dependent visual biases occur for power-grasp objects, but not ungraspable ones.

Keywords:
Change detectionGrasp affordancesPerihand spaceVisual processingVisual search

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Area of Science:

  • Cognitive psychology
  • Neuroscience
  • Visual perception

Background:

  • Observers exhibit visual-processing biases in perihand space, potentially linked to grasping actions.
  • Previous research indicated grasp-specific visual sensitivities: power grasps enhance temporal sensitivity, precision grasps enhance spatial sensitivity.

Purpose of the Study:

  • To investigate how object affordances interact with hand positioning to influence visual biases in perihand space.
  • To extend previous findings by examining the combined effects of hand posture and object graspability on visual perception.

Main Methods:

  • Three experiments utilized a change detection task on object images.
  • Manipulated variables included hand position (near/far), grasp posture (power/precision), and change type (orientation/identity).
  • Participants viewed objects affording power grasp, precision grasp, or no grasp.

Main Results:

  • No perihand visual biases were found in the first experiment.
  • Experiments 2 and 3 revealed grasp-dependent biases near the hands for power-grasp objects.
  • Ungraspable objects did not elicit similar perihand space biases.

Conclusions:

  • The influence of hand position on visual perception is mediated by both hand grasp posture and object affordances.
  • Object graspability plays a crucial role in shaping visual biases within perihand space.
  • These findings highlight the intricate relationship between action, perception, and object properties.