( ( The ( ( least positive ) feedback ) ) ( ( is ( no feedback ) ) . ) )
(ROOT (S (NP (DT The) (ADJP (JJS least) (JJ positive)) (NN feedback)) (VP (VBZ is) (NP (DT no) (NN feedback))) (. .)))
The least positive feedback is no feedback.
(ROOT (S (NP (JJ Positive) (NN feedback)) (VP (VP (VBZ intensifies) (NP (NP (DT a) (NN change)) (PP (IN in) (NP (NP (DT the) (NN body) (POS 's)) (JJ physiological) (NN condition))))) (CONJP (RB rather) (IN than)) (VP (VBG reversing) (NP (PRP it)))) (. .)))