( ( The feedback ) ( ( is positive ) . ) )
(ROOT (S (NP (DT The) (NN feedback)) (VP (VBZ is) (ADJP (JJ positive))) (. .)))
The feedback is positive.
(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)))) (. .)))