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Related to tropotaxis: telotaxis, rheotaxis, geotaxis, Klinotaxis


the movement of an animal in response to stimuli received simultaneously from two separate sense organs
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌtrɒp əˈtæk sɪs, ˌtroʊ pə-)

straight movement by an organism toward or away from a source of stimulation as a result of comparing information received by paired sensory receptors on both sides of the body.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Tropotaxis is a mechanism by which the animal makes simultaneous comparisons with two or more sensors to yield an instantaneous estimate for guidance to move with or against a cue gradient.
Although tropotaxis seems a robust mechanism for edge detection, the strategy mediating movement to the source is less well known.
Mechanisms known to be used for orienting with respect to chemical gradients include chemotaxis or chemokinesis and rely upon the ability to sample the milieu either spatially (comparing inputs to more than one chemosensory structure at the same time and responding to balance inputs--more correctly known as tropotaxis) or temporally (sampling at one location, moving, then sampling again--more correctly known as klinotaxis).