Gradations of interpretability in spoken complex word recognition

In an ERP experiment with cross-modal priming, we found evidence for graded interpretability of complex pseudowords, expressed as differences in the degree of priming between a complex pseudoword and its embedded base word. Only pseudowords that were constructed according to the morphological constraints of the language (for instance that nouns suffixed in {-ung} in German must be derived from a verbal base) led to significant attenuation of the N400 component relative to an unrelated control. Novel formations that consisted of the concatenation of a stem and affix regardless of their combinability (e.g. wirr (A., ‘confused’) and {-lein} suffix in German) did not modulate the N400 component. Moreover, gradations in degree of priming were observed with novel pseudowords that were the result of several morphological operations as a function of the composition of the full sequence of morphological operations. Any positions within the sequence that were filled by possible, but non-existing formations (thus compare hübsch (A., ‘pretty’) > *hübschen (V., ‘beautify’) > *Hübschung (N., ‘beautification’) versus spitz (A., ‘sharp’) > spitzen (V., ‘sharpen’) > *Spitzung (N., ‘sharpening’), whereby in the former the intermediate position is expressed through a possible, but non-existing verb form) led to reduced activation of the base word. These findings corroborate previous behavioural and neuroimaging results in visual word recognition that found support for step-wise morphological decomposition in multi-affixed pseudowords and reveal that the composition of the derivational path can lead to gradations of interpretability in the recognition of spoken complex pseudowords