Challenge is in the eye of the beholder: A heavy burden can slant our world

An article published in the recent issue of Perspectives on Psychological Science investigates the impact of fatigue, physical ability, and potential bodily endangerment on how we perceive our environment. The author finds that we have a natural tendency to view hills as steeper when we are tired, less physically able, or carrying a heavy load. Likewise, inclines appear greater and the distance to the ground appears further when there is a perceived risk of injury. The author attributes this perceptual variance to our instinctive need to conserve energy and protect ourselves from harm. "The visually specified layout of the environment is modulated in perception in ways that promote effective, efficient, and safe behavior."

Participants were asked to estimate the steepness of hills, both from the bottom and at a cross-section, before and after a physically demanding run. The results displayed a trend for participants to estimate the steepness of the hill as greater after completing the run. Similar over-estimation occurred when participants were asked to estimate the steepness of hills when wearing a heavy backpack, or when the participant was elderly or otherwise less physically able. Another experiment placed participants at the top of a hill steep hill, standing on a skateboard. The perceived risk of bodily injury led the participants standing on skateboards to estimate the slope of the hill to be greater than their counterparts on secure ground. The author concludes that "what one sees in the world is influenced not only by optical and ocular-motor information, but also by one's purposes, physiological state, and emotions."


Contact: Jill Yablonski
Blackwell Publishing Ltd.

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