The most important observation from the table is that JRNN significantly outperforms all the other methods with large margins when the input sentences contain more than one events (i.e, the row labeled with 1/N in the table).
jRNN is 13.9% better than DMCNN on trigger labeling while the corresponding improvement for argument role labeling is 6.5%, thereby further suggesting the benefit of jRNN with the memory features.