Chapter

Hermann Lotze’s Theory of ‘Local Sign’: evidence from pointing responses in an illusory figure

Dean R. Melmoth, Marc S. Tibber and Michael J. Morgan

in Perception, Action, and Consciousness

Published in print August 2010 | ISBN: 9780199551118
Published online January 2011 | e-ISBN: 9780191594960 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780199551118.003.0006
Hermann Lotze’s Theory of ‘Local Sign’: evidence from pointing responses in an illusory figure

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Hermann Lotze's Theory of ‘Local Signs’ (Localzeichen) proposed that our visual sense of the position of objects in the visual scene uses the same mechanism as that required to move the eyes and hands. An alternative is that perceptual and motor responses depend on different neural substrates. This chapter tests whether perceptual and motor ‘pointing’ responses are similarly affected by a well-known perceptual bias: the Pogendorff illusion. It shows that perceptual and motor pointing responses are significantly affected in the same direction by the Poggendorff effect, except that the motor biases are somewhat greater. The results support Lotze's conjecture of a unified representation of spatial position for perception and action, rather than the two-stream model.

Keywords: Hermann Lotze; visual sense; object position; perceptual response; motor response; pointing; perceptual bias; Pogendorff illusion; perception; action

Chapter.  4845 words.  Illustrated.

Subjects: Cognitive Psychology

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