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Philosophical Papers Volume II$
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David Lewis

Print publication date: 1987

Print ISBN-13: 9780195036466

Published to Oxford Scholarship Online: November 2003

DOI: 10.1093/0195036468.001.0001

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Veridical Hallucination and Prosthetic Vision

Veridical Hallucination and Prosthetic Vision

(p.273) Twenty‐Four Veridical Hallucination and Prosthetic Vision
Philosophical Papers Volume II

David Lewis

Oxford University Press

Argues that the difference between veridical hallucination and genuine seeing cannot be accounted for in terms of the absence of the normal causal process for seeing, since that process is also absent in cases of prosthetic vision. It is proposed instead that the difference lies in the pattern of counterfactual dependence of visual experience on the scene before the eyes. The paper contains a postscript with further considerations on the notion of a “suitable pattern of counterfactual dependence.”

Keywords:   causal process, counterfactual dependence, hallucination, prosthetic vision, seeing

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