In Chapter 8, we look at biolinguistic variation within our own species, tracing the effects of language disorders on thought, depending on whether changes in the linguistic genotype are involved or not. We devote particular attention to Formal Thought Disorder in schizophrenia, for which the Un-Cartesian hypothesis makes an obvious prediction: grammar should disintegrate in this condition as well, along with the fragmentation of thought that we observe there. This, we conclude there, turns out to be a real possibility: looking at grammar with Un-Cartesian eyes, therefore, may throw light, not only on thought, but on mental health as well. That language in its normal use is a condition for mental health seems a natural suggestion: a sane thinker is also a speaker. Yet language has barely looked at as playing this role, which reflects its status in philosophy and psychiatry today.
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