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Related Experiment Videos

Visual-motor recalibration in geographical slant perception.

M Bhalla1, D R Proffitt

  • 1Department of Psychology, Loyola University, New Orleans, Louisiana 70118, USA. bhalla@nadal.loyno.edu

Journal of Experimental Psychology. Human Perception and Performance
|August 28, 1999
PubMed
Summary

Physical condition affects perceived steepness, but not visually guided actions. The study explores the interconnectedness of awareness and action systems, revealing time-dependent coordination between them.

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Area of Science:

  • Cognitive Psychology
  • Human Physiology
  • Perception Science

Background:

  • Perception of environmental features like slope is crucial for navigation and action.
  • Physiological state can influence subjective experiences, including visual perception.
  • The relationship between visual awareness and visually guided action is complex and may be modulated by internal states.

Purpose of the Study:

  • To investigate how physiological potential influences the perception of environmental steepness.
  • To determine if visually guided actions are similarly affected by physiological potential.
  • To examine the interplay and coordination between visual awareness and action systems under varying physiological conditions.

Main Methods:

  • Four experiments were conducted involving manipulations of physiological potential: heavy backpack load, fatigue, low physical fitness, and age/health status.
Keywords:
NASA Center ARCNASA Discipline Space Human Factors

Related Experiment Videos

  • Participants' perception of hill steepness was assessed.
  • Visually guided actions were measured to assess their independence from perceived steepness.
  • The recalibration of the relationship between awareness and action was analyzed across different timescales of physiological change.

    • Main Results:

    • Hills were perceived as steeper when individuals were encumbered, fatigued, less fit, or in declining health.
    • Visually guided actions remained unaffected by these changes in physiological potential.
    • Awareness and action systems, though dissociable, demonstrated interconnectedness.
    • Recalibration occurred with long-term physiological changes (fitness, age, health) but not with short-term changes (fatigue, load).

    Conclusions:

    • Perception of environmental steepness is sensitive to an individual's physiological state.
    • Visually guided actions are more robust and less affected by transient physiological changes.
    • The findings highlight a time-dependent coordination between explicit visual awareness and visually guided action systems, influenced by physiological potential.