Simplicity and complexity in constructions: Evidence from aphasia

Linguistic complexity is usually approached in terms of markedness and branching structure, and psycholinguistic complexity in terms of frequency, sequential probability, and working memory load. However, predictions made on these bases appear to be inadequate to explain many patterns seen in aphasic speech. Psycholinguistic analyses of aphasic errors provide an empirical basis for describing lexical, morphological, and syntactic contributions to language complexity. We compare the predictions made by existing descriptions of complexity to aphasic error data as reported in cross‐linguistic studies. A construction‐based approach may be able to unify the patterns seen across lexicon, morphology and syntax.