( ( The ( positive feedback ) ) ( then ( ( acts ( to ( enhance ( this ( reversed ( SST pattern ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (JJ positive) (NN feedback)) (ADVP (RB then)) (VP (VBZ acts) (S (VP (TO to) (VP (VB enhance) (NP (DT this) (ADJP (JJ reversed)) (NNP SST) (NN pattern)))))) (. .)))
The positive feedback then acts to enhance this reversed SST pattern.
(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)))) (. .)))