Normals display selective deficits in morphology and syntax under adverse p
rocessing conditions. Digit loads do not impair processing of passives and
object relatives but do impair processing of grammatical morphemes. Percept
ual degradation and temporal compression selectively impair several aspects
of grammar, including passives and object relatives. Hence we replicate Ca
plan & Water's specific findings but reach opposite conclusions, based on w
ider evidence.