the language of thought : part i joe lau philosophy hku
TRANSCRIPT
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The Language of Thought : Part I
Joe Lau
Philosophy
HKU
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Readings
Ned Block’s “The Mind as the Software of the Brain” Murat Aydede “The LOT Hypothesis” at
http://plato.stanford.edu/entries/language-thought/ Ch. 10 “The Language of Thought” in Braddon-Mitchell and
Jackson's Philosophy of Mind and Cognition. Fodor and Pylyshyn’s article.
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Two types of mental states
Intentional vs. Phenomenal Intentional = aboutness, with content/meaning
– E.g. beliefs, knowledge, desires Phenomenal = qualitative (“what-is-it-like-
ness”, qualia)– E.g. pain, itches, sensations
Might have both features– E.g. perception, imagination
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The Language of Thought Hypothesis
LOT : Intentional mental states -– Linguistic mental representations– Possess a combinatorial syntax and
semanticsComplex representations built from atomic ones.Meanings of complex representations depend on
menaings of the atomic ones and the syntax.
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LOT says nothing about :
Whether LOT is NL. Whether LOT is innate or learnt. Whether all humans, or all thinkers, have the
same LOT. The material basis of LOT.
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Why think that LOT is plausible?
1. Explains mind-body interaction.
2. Explains the productivity and systematicity of thoughts.
3. Explains the opacity of thoughts.
4. Explains inferential reasoning.
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Mind-body interaction
Intentional mental states can causally interact with perception, behaviour and other mental states.
Example : visual experience causes belief, belief causes action
Explanation : Intentional mental states are mental representations in the brain. Being physical states they can interact with our sensory organs and motor systems and other physical mental representations.
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Productivity
Productivity : The number of thoughts a human being can entertain is practically infinite.
Explanation : A finite number of atomic mental representations can combine with one another in different ways to generate a huge number of complex mental representations.
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Systematicity
Systematicity : the thoughts we can entertain are all systematicaly related in content.– Example : Evans’ Generality Constraint - if a thinker
can think a is F, and b is G, then he must be able to think a is G, and b is F.
Explanation : the atomic representations that constitute thoughts must be able to recombine to form thoughts which have distinct but semantically related contents.
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Opacity
Opacity : The thought that a is F is distinct from the thought that b is F, even if a=b.– Example : One can believe that superman can fly
without believing that Clark Kent can fly, even though Clark Kent is Superman.
Explanation : There can be distinct mental representations that refer to the same thing, and which have different conceptual roles.
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Inferential Reasoning
It seems that there are rule-like regularities in reasoning. Examples :– Normally we do not believe in contradictions (P and
not-P).– If we are aware that if P then Q and P, then we
would normally believe Q (modus ponens). Explanation : Reasoning consists in formal
operations on structured mental representations according to their form.
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Some Objections from Dennett
See Block’s paper
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Evaluating the Hypothesis
How to evaluate scientific hypothesis? Inference to the best explanation.
– What is the best?– Evidence, predictions, consistency, simplicity
Any alternative explanations?
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An Alternative : The Map Theory
Proposal : Intentional mental states are map-like and not language-like.
See Braddon-Mitchell and Jackson for further discussion. The map theory can also explain mind-body causal
interaction, systematicity, productivity, opacity. What about:
– Inferential reasoning– Abstract concepts in logic or mathematics– Disjunctive or conjunctive beliefs
Special representations are needed, but then how is it different from LOT?