Published online by Cambridge University Press: 03 March 2026
Sentences with syntactic movement out of sentential complements of manner-of-speaking (MoS) verbs (e.g. whisper, shout) are degraded in acceptability, an effect called the manner-of-speaking (MoS) island effect. Accounts variably attribute the MoS island effect to the violation of the subjacency condition, to the low frequency of MoS verbs taking sentential complements, or to a general information-structural constraint that discourse-backgrounded constituents cannot be extracted. In five acceptability judgment experiments, we find that the MoS island effect can be modulated by foregrounding or backgrounding the extracted constituent, suggesting a causal relationship between discourse backgroundedness and this effect. Our findings challenge syntactic and frequency accounts of the MoS island effect.