Locomotor adaptation versus perceptual adaptation when stepping over an obstacle with a height illusion.

PloS One
Christopher K RheaJeffery M Haddad

Abstract

During locomotion, vision is used to perceive environmental obstacles that could potentially threaten stability; locomotor action is then modified to avoid these obstacles. Various factors such as lighting and texture can make these environmental obstacles appear larger or smaller than their actual size. It is unclear if gait is adapted based on the actual or perceived height of these environmental obstacles. The purposes of this study were to determine if visually guided action is scaled to visual perception, and to determine if task experience influenced how action is scaled to perception. Participants judged the height of two obstacles before and after stepping over each of them 50 times. An illusion made obstacle one appear larger than obstacle two, even though they were identical in size. The influence of task experience was examined by comparing the perception-action relationship during the first five obstacle crossings (1-5) with the last five obstacle crossings (46-50). In the first set of trials, obstacle one was perceived to be 2.0 cm larger than obstacle two and subjects stepped 2.7 cm higher over obstacle one. After walking over the obstacle 50 times, the toe elevation was not different between obstacles, but obstac...Continue Reading

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Citations

May 20, 2014·Experimental Brain Research·Michel J H HeijnenShirley Rietdyk
Sep 14, 2012·Experimental Brain Research·Michel J H HeijnenShirley Rietdyk
Mar 24, 2016·Gait & Posture·Matthew A TimmisShahina Pardhan
Apr 8, 2011·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Shirley Rietdyk, Christopher K Rhea
Feb 1, 2019·Communications Biology·Cristina de la MallaJeroen B J Smeets
Dec 13, 2019·Royal Society Open Science·N KluftM Pijnappels
Jan 12, 2020·Communications Biology·Cristina de la MallaJeroen B J Smeets
May 8, 2021·Royal Society Open Science·Katherine A J Daniels, J F Burn

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