About This Book
The author traces how abstraction and generalization arise from perception and develop through three main stages: pre-linguistic operations observable in animals, children, and deaf-mutes; an intermediate phase in which words progressively accompany and transform thought; and a superior stage where linguistic symbols alone support complex conceptual systems. Abstraction is presented as an attention-driven strengthening of some aspects of experience while others are attenuated. The study analyzes generic images, numerical perception, analogical reasoning, the origin and formation of speech and grammatical categories, and the comparative role of gestures and phonetic language in the ascending evolution of symbolic thought.
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