Morphological units in the Arabic mental lexicon.

Standard views of morphology in Modern Standard Arabic hold that surface word forms comprise at least two morphemes: a three-consonantal root conveying semantic meaning and a word pattern carrying syntactic information. An alternative account claims that semantic information is carried by a bi-consonantal morphological unit called the etymon. Accordingly, in the form [batara] the core meaning is carried not by the tri-consonantal root morpheme [btr] but by the etymon morpheme [b,t] which surfaces in other forms like [batta] "sever", [batala] "cut off" with the same meaning "cutting". Previous experimental research in Semitic languages has assumed the tri-consonantal root/word pattern approach. In cross-modal and masked priming experiments we ask whether the etymon, as a more fine-grained two-consonantal morphological unit, can yield the morphological priming effects typically obtained with tri-consonantal root morphemes. The results clearly show that two words sharing an etymon do facilitate each other both in cross-modal and masked priming even though they do not share a root, controlling for semantic and for form overlap effects. The bearing of these results on theories of morphological processing and representation is discussed.