In the article it is argued that the conviction that verbally expressed language (as commonly em-ployed by humans) is necessary for thinking is not justified. Animals have been found to employ various communication systems (languages) and, though these are different from human language, they testify to consciousness and thought. Recent research among autistic people has indicated that they frequently think in images rather than words, and it is suggested that this was the original feature of human thinking and may also be the basis of animal thinking.
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