3 Concept attainment experiments -- 4 Experiments on reasoning -- 5 Insight problems -- 5 Thinking and language: some problems -- 1 Linguistic relativity -- 2 The Piagetian view -- 3 Genetic roots of thought and speech -- 4 Comparison of theories -- 5 Animal communication -- 6 Innate linguistic universals? -- 7 Linguistic data -- 6 Theories of language -- 1 Skinner's 'Verbal Behaviour' -- 2 Osgood's mediation theory of meaning -- 3 Information theory -- 4 Chomsky's transformational grammar -- 5 Models of semantic memory -- 6 Generative semantics -- 7 Psycholinguistic experiments