Usage History of 'reinforcers'

The following chart shows how frequently 'reinforcers' appeared in printed materials over time. For example, the word 'reinforcers' occurred 6 times in books in 1867 and 15,756 times in 2008. From 1867 to 2008, the word 'reinforcers' was used a total of 702,631 times in books scanned by Google. See Reference: Google Ngram project.

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