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Perception, Action, and ConsciousnessSensorimotor Dynamics and Two Visual Systems$
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Nivedita Gangopadhyay, Michael Madary, and Finn Spicer

Print publication date: 2010

Print ISBN-13: 9780199551118

Published to Oxford Scholarship Online: January 2011

DOI: 10.1093/acprof:oso/9780199551118.001.0001

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

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

Chapter:
(p.95) Chapter 6 Hermann Lotze’s Theory of ‘Local Sign’: evidence from pointing responses in an illusory figure
Source:
Perception, Action, and Consciousness
Author(s):

Dean R. Melmoth

Marc S. Tibber

Michael J. Morgan

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780199551118.003.0006

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

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