However, the difference that we have reported here between the unmarked errors of Broca's aphasics, and the oblique case errors of Wernicke's aphasics, does seem to support a contrast between positive errors (i.e. a strategy of deliberate avoidance) and negative errors (i.e. uncontrolled substitution errors that occur in the effort to produce a fluent and complexe utterance despite obvious problems in lexical/morphological access).
- Bates & Friederici & Wulfeck (2004), Pag. 295