Publications of Place that refer to Devany Hayes & Nelson (1986). Equivalence class formation in language-able and language-disabled children.

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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Download: 1989c Concept Acquisition and Ostensive Learning - A Response to Professor Stemmer.pdf