Mechanism, truth, and Penrose's new argument

Journal of Philosophical Logic 32 (1):19-42 (2003)
Stewart Shapiro
Ohio State University
Sections 3.16 and 3.23 of Roger Penrose's Shadows of the mind (Oxford, Oxford University Press, 1994) contain a subtle and intriguing new argument against mechanism, the thesis that the human mind can be accurately modeled by a Turing machine. The argument, based on the incompleteness theorem, is designed to meet standard objections to the original Lucas-Penrose formulations. The new argument, however, seems to invoke an unrestricted truth predicate (and an unrestricted knowability predicate). If so, its premises are inconsistent. The usual ways of restricting the predicates either invalidate Penrose's reasoning or require presuppositions that the mechanist can reject
Keywords incompleteness  Lucas  mechanism  Penrose  truth
Categories (categorize this paper)
Reprint years 2004
DOI 10.1023/A:1022863925321
Edit this record
Mark as duplicate
Export citation
Find it on Scholar
Request removal from index
Revision history

Download options

Our Archive

Upload a copy of this paper     Check publisher's policy     Papers currently archived: 33,762
Through your library

References found in this work BETA

Outline of a Theory of Truth.Saul A. Kripke - 1975 - Journal of Philosophy 72 (19):690-716.
Minds, Machines, And Mathematics A Review of Shadows of the Mind by Roger Penrose. [REVIEW]David J. Chalmers - 1995 - PSYCHE: An Interdisciplinary Journal of Research On Consciousness 2:11-20.
Penrose's Gödelian Argument A Review of Shadows of the Mind by Roger Penrose. [REVIEW]S. Feferman - 1995 - PSYCHE: An Interdisciplinary Journal of Research On Consciousness 2:21-32.

View all 19 references / Add more references

Citations of this work BETA

Non‐Classical Knowledge.Ethan Jerzak - forthcoming - Philosophy and Phenomenological Research.
Proving That the Mind Is Not a Machine?Johannes Stern - 2018 - Thought: A Journal of Philosophy 7 (2):81-90.
Turing's Responses to Two Objections.Darren Abramson - 2008 - Minds and Machines 18 (2):147-167.

View all 8 citations / Add more citations

Similar books and articles

Penrose's New Argument.Per Lindström - 2001 - Journal of Philosophical Logic 30 (3):241-250.
Yesterday's Algorithm: Penrose and the Godel Argument.William Seager - 2003 - Croatian Journal of Philosophy 3 (9):265-273.
Remarks on Penrose's New Argument.Per Lindstrom - 2006 - Journal of Philosophical Logic 35 (3):231-237.
Mechanisms, Microtubules, and the Mind.Roger Penrose - 1994 - Journal of Consciousness Studies 1 (2):241-49.


Added to PP index

Total downloads
93 ( #65,552 of 2,263,202 )

Recent downloads (6 months)
2 ( #210,085 of 2,263,202 )

How can I increase my downloads?

Monthly downloads

My notes

Sign in to use this feature