Psychological Essentialism and Semantic Externalism: Evidence for Externalism in Lay Speakers' Language Use

Philosophical Psychology 22 (1):37-60 (2009)
Abstract
Some experimental studies have recently claimed to undermine semantic externalism about natural kind terms. However, it is unclear how philosophical accounts of reference can be experimentally tested. We present two externalistic adaptations of psychological placeholder essentialism, a strict externalist and a hybrid externalist view, which are experimentally testable. We examine Braisby's et al. (1996) study which claims to undermine externalism, and argue that the study fails in its aims. We conducted two experiments, the results of which undermine internalism and the hybrid theory, and support strict externalism. Our conclusion is that lay speakers' natural kind concepts involve a belief in an external category essence, which determines reference.
Keywords Psychological essentialism  Reference  Semantic externalism  Natural kind terms
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