A robust finding from language acquisition, adult processing, and individuals with language impairment is that certain types of Object Relatives (ORs) and Object Questions (OQs) are more challenging in both production and comprehension compared to their Subject counterparts. Approaches informed by linguistic theory have been proposed to clarify the source of the difficulties with these sentences in people with aphasia, with recent models supporting the idea of a grammatically based resource reduction selectively affecting sentences that require the processing of an element acting as an intervener.