Theoretical accounts of the language production process have claimed that grammatical encoding steps during the formulation stage happen in a largely automatic fashion, unimpeded by other cognitive processes (cf. Meyer, Wheeldon, & Krott, 2007: x). By eliciting agreement attraction errors, our study tested the effect of external distractor noise on the generation of subject-verb agreement in spoken language. We modelled noisy environments with three different speech-free sounds with spectral, or both spectral and intensity modulation characteristics of speech. In silence and unmodulated noise we found evidence for a plural mismatch effect, where a plural local noun attracts agreement away from a singular marked head noun. Under modulated noise the error patterns changed, and the number of errors increased in cases where the head noun of the preamble was marked for plural. In addition, background noise led to a reduction of speech rate and a reduction of utterance latency. Our results