( And ( ( ( some implications ) ( of mentalism ) ) ( ( ( are not ) ( ( ( ( only testable ) , ) but ) ( have ( to ( ( ( some extent ) already ) ( been ( ( ( borne out ) ( in ( spite ( of ( the fact ) ) ) ) ) ( that ( they ( strike ( ( the materialist ) ( as incredible ) ) ) ) ) ) ) ) ) ) ) ) . ) ) )
(ROOT (S (CC And) (NP (NP (DT some) (NNS implications)) (PP (IN of) (NP (NN mentalism)))) (VP (VBP are) (RB not) (ADJP (ADJP (RB only) (JJ testable)) (, ,) (CC but) (ADJP (JJ have) (PP (TO to) (NP (NP (DT some) (NN extent)) (ADVP (RB already)) (VP (VBN been) (VP (VBN borne) (PRT (RP out)) (PP (IN in) (NP (NP (NN spite)) (PP (IN of) (NP (DT the) (NN fact))))) (SBAR (IN that) (S (NP (PRP they)) (VP (VBP strike) (S (NP (DT the) (NN materialist)) (ADJP (RB as) (JJ incredible))))))))))))) (. .)))
And some implications of mentalism are not only testable, but have  to some extent already been borne out in spite of the fact that they strike the materialist as incredible.
(ROOT (S (NP (DT A) (NN fact) (CC or) (NN question)) (VP (VBZ is) (ADVP (RB only)) (VP (VBN considered) (NP (NN science)) (SBAR (IN if) (S (NP (PRP it)) (VP (VBZ is) (ADJP (JJ testable))))))) (. .)))