Experiments involving 121 college students in the Netherlands were based on the hypothesis that the difficulty of retrieving a lexical item for language production has at least 2 different sources. Experiments supported the distinction between a preverbal conceptual and a lexical level of representation in language production. (SLD)

Form-oriented errors of verbal inflection in speech are examined as indicators of cognitive processing in six experiments with college undergraduates. Appendices list words used as stimuli in the six experiments. (LMO)