Sentence:  MacLean stressed correctly the importance of the visceral brain for preservation of the individual and the species , as <WSD>evidenced</WSD> by the influence of the limbic brain ( including the hypothalamus ) on emotions related to fight and flight and also on sexual functions . 
Meaning of the word marked with <WSD> tags:  provide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes