Usage History of 'psychobiology'

The following chart shows how frequently 'psychobiology' appeared in printed materials over time. For example, the word 'psychobiology' occurred 4 times in books in 1845 and 6,156 times in 2008. From 1845 to 2008, the word 'psychobiology' was used a total of 185,043 times in books scanned by Google. See Reference: Google Ngram project.

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