Table 6 shows that: 1) For both negation and speculaiton scope identification, automatic syntactic parsing lowers the performance on the abstracts subcorpus (e.g., from 83.10% to 81.84% in accuracy for negation scope identification and from 86.41% to 83.74% in accuracy for speculaiton scope identification).
the performance drop shows that both negation and speculation scope identification are not as senstive to automatic syntactic parsing as common shallow semantic parsing, whose performance might decrease by about ~10 in F1measure (Toutanova et al., 2005).