Usage History of 'phosphene'

The following chart shows how frequently 'phosphene' appeared in printed materials over time. For example, the word 'phosphene' occurred 2 times in books in 1850 and 342 times in 2008. From 1850 to 2008, the word 'phosphene' was used a total of 14,167 times in books scanned by Google. See Reference: Google Ngram project.

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