who would have been most likely to ignore mental processes and to define psychology as ""the scientific study of observable behavior""?

A behaviorist such as John B. Watson and B. F. Skinner would disagree with the notion that psychology is the scientific study of mental processes. This is because behaviorism is a psychology school of thought wherein human behavior can be simply explained in terms of conditioning, without regard to thoughts or feelings. Please see my comment for more information. I hope this helps; have a great day.

- "instead, differing christian groups often believed that their own practices and faiths and the reforming puritans, contributing to an english civil war in the 1600s. indians, and they were the first to issue a public condemnation of slavery in america. up a wave of religious fervor and the beginning of the great awakening."

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