( ( Heinrich Erb ) ( ( ( recommended ( testing ( ( the ( patellar-tendon reflex ) ) ( -LRB- ( ( ( the ( knee-jerk reflex ) ) ( we ( all ( ( know and ) love ) ) ) ) -RRB- ) ) ) ) ) ( by ( ( striking ( the tendon ) ) ( with ( either ( ( ( a finger ) or ) ( a ( percussion hammer ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Heinrich) (NNP Erb)) (VP (VBD recommended) (S (VP (VBG testing) (NP (NP (DT the) (JJ patellar-tendon) (NN reflex)) (PRN (-LRB- -LRB-) (NP (NP (DT the) (JJ knee-jerk) (NN reflex)) (SBAR (S (NP (PRP we)) (ADVP (DT all)) (VP (VBP know) (CC and) (VBP love))))) (-RRB- -RRB-))))) (PP (IN by) (S (VP (VBG striking) (NP (DT the) (NN tendon)) (PP (IN with) (NP (CC either) (NP (DT a) (NN finger)) (CC or) (NP (DT a) (NN percussion) (NN hammer)))))))) (. .)))
Heinrich Erb recommended testing the patellar-tendon reflex (the knee-jerk reflex we all know and love) by striking the tendon with either a finger or a percussion hammer.
(ROOT (X (NP (DT The) (`` ``) (JJ knee-jerk) ('' '') (NN motion)) (SBAR (IN that) (S (NP (NNS people)) (ADVP (RB involuntarily)) (VP (VBP perform) (SBAR (IN after) (S (S (VP (VBG being) (VP (VBN struck) (PP (IN in) (NP (NP (DT the) (NN knee)) (PP (IN in) (NP (DT a) (JJ certain) (NN way)))))))) (VP (VBZ is) (NP (NP (DT an) (NN example)) (PP (IN of) (NP (DT a) (JJ reflex))))))))))))