( ( ( ( ( small microphones ) ( are ( placed ( in ( ( the ( infant 's ) ) ( external ear ) ) ) ) ) ) and ) ( ( ( a ( measured response ) ) ( to ( the stimulus ) ) ) ( is recorded ) ) ) . )
(ROOT (S (S (NP (JJ small) (NNS microphones)) (VP (VBP are) (VP (VBN placed) (PP (IN in) (NP (NP (DT the) (NN infant) (POS 's)) (JJ external) (NN ear)))))) (CC and) (S (NP (NP (DT a) (JJ measured) (NN response)) (PP (TO to) (NP (DT the) (NN stimulus)))) (VP (VBZ is) (VP (VBN recorded)))) (. .)))
small microphones are placed in the infant's external ear and a measured response to the stimulus is recorded.
(ROOT (S (NP (DT The) (NNS ears)) (VP (VBP are) (NP (NP (DT an) (JJ external) (NN feature)) (PP (IN in) (NP (JJ human) (NNS beings))) (SBAR (S (VP (VBZ is) (ADJP (JJ responsible) (PP (IN for) (NP (NN balance))))))))) (. .)))