Publications of Place that refer to Dugdale (1987). A search for symmetry in the conditional discriminations of language-trained chimpanzees (Paper presented at the Annual Conference of the Experimental Analysis of Behaviour Group, Manchester, April 1987).

Place, U. T. (1989c). Concept acquisition and ostensive learning: a response to Professor Stemmer. Behaviorism, 17, 141-145.
The alternative offered by Professor Stemmer to cognitivist theories of the process whereby general terms acquire their meaning is criticised in its turn on the grounds that it presents an oversimplified view of the complex processes involved in the acquisition of word meanings.
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