Usage History of 'echolalia'

The following chart shows how frequently 'echolalia' appeared in printed materials over time. For example, the word 'echolalia' occurred 2 times in books in 1878 and 2,984 times in 2008. From 1878 to 2008, the word 'echolalia' was used a total of 87,377 times in books scanned by Google. See Reference: Google Ngram project.

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