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Data from aphasiology and from developmental and experimental psychology are reviewed that give evidence for partial separability of the gestural and the verbal systems. According to McNeill (1985), who argued for a shared computational stage at the conceptual level, these cases of dissociation may be accounted for only by assuming separation at the output level. This explanation seems incompatible with other data provided by McNeill that indicate similarities in the surface characteristics of gestures and speech. Thus it is concluded that gestures and speech could also interact on an intermediate level between conceptualization and the output processing or that the shared computational stage must be specified by assuming separate subprocesses that may dissociate.(PsycINFO Database Record (c) 2016 APA, all rights reserved)