This strongly indicates that the parallelism effect is an instance of a general processing mechanism, such as syntactic priming (Bock, 1986), rather than specific to coordination, as suggested by (Frazier and Clifton, 2001).
we also found that the parallelism effect is strongest in coordinate structures, which could explain why comprehension experiments so far failed to demonstrate the effect for other structural configurations (Frazier et al., 2000).