Curvature in hand movements as a result of visual misjudgements of direction

Curvature in hand movements as a result of visual misjudgements of direction Spatial Vision , Vol. 15, No. 4, pp. 393– 414 (2002) Ó VSP 2002. Also available online - www.vsppub.com Curvature in hand movements as a result of visual misjudgements of direction ELI BRENNER ¤ , JEROEN. B. J. SMEETS and H. C. M. REMIJNSE-TAMERIUS Vakgroep Fysiologie, Erasmus Universiteit, Postbus 1738, 3000 DR Rotterdam, The Netherlands Received 31 October 2001; revised 2 January 2002; accepted 5 April 2002 Abstract —The path that our hand takes when moving from one position to another is often slightly curved. Part of this curvature is caused by perceptual errors. We examine here whether this is so for the in uence that a surface’s orientation has on the approaching hand’s path. When moving our hand towards a point on a surface we tend to follow a path that makes the Ž nal approach more orthogonal to the surface at that point. Doing so makes us less sensitive to imperfections in controlling our movements. Here we show that this tendency is also present when moving towards a point along an edge of a drawing of an oriented bar. The in uence of the bar’s orientation is no smaller when people are explicitly asked to move http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Spatial Vision (continued as Seeing & Perceiving from 2010) Brill

Curvature in hand movements as a result of visual misjudgements of direction

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Abstract

Spatial Vision , Vol. 15, No. 4, pp. 393– 414 (2002) Ó VSP 2002. Also available online - www.vsppub.com Curvature in hand movements as a result of visual misjudgements of direction ELI BRENNER ¤ , JEROEN. B. J. SMEETS and H. C. M. REMIJNSE-TAMERIUS Vakgroep Fysiologie, Erasmus Universiteit, Postbus 1738, 3000 DR Rotterdam, The Netherlands Received 31 October 2001; revised 2 January 2002; accepted 5 April 2002 Abstract —The path that our hand takes when moving from one position to another is often slightly curved. Part of this curvature is caused by perceptual errors. We examine here whether this is so for the in uence that a surface’s orientation has on the approaching hand’s path. When moving our hand towards a point on a surface we tend to follow a path that makes the Ž nal approach more orthogonal to the surface at that point. Doing so makes us less sensitive to imperfections in controlling our movements. Here we show that this tendency is also present when moving towards a point along an edge of a drawing of an oriented bar. The in uence of the bar’s orientation is no smaller when people are explicitly asked to move

Journal

Spatial Vision (continued as Seeing & Perceiving from 2010)Brill

Published: Jan 1, 2002

Keywords: MOVEMENTS; PERCEPTION AND ACTION; CURVATURE; PATH; HUMAN

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