Sentence:  Strong stress on hunger treats hunger as an additional stimulus , strong stress on stimulates treats stimulation as an additional effect of hunger , strong stress on man treats <WSD>man</WSD> as an additional creature who responds to the stimulation of hunger . 
Meaning of the word marked with <WSD> tags:  any living or extinct member of the family Hominidae characterized by superior intelligence, articulate speech, and erect carriage