Abstract: The mechanism of selection errors in Chinese character naming of a developmental dyslexic case S was investi-gated in three experiments:Chinese character naming,lexical decision and making compound words.There were three main findings.The result of Experiment 1 showed that S made many selection errors compared with the age and IQ mat ched controls.The numbers of selection errors occurred in first morphemes or second morphemes of compound words were not significantly different;Experiment 2 showed that S was confused with two morpheme's positions in a compound word;Experiment 3 showed that controls produced more words than S with the character that S made selection errors and frequencies of the words which may lead S to produce select ion errors was significantly higher than average frequencies of the rest words.These results provide support to Zhou&Wilson(2000)'s multi-level representational model,the results also extend Zhou et al's model by showing interaction between morpheme frequencies and morpheme semantic structures in S's Chinese character naming.

Key words: developmental dyslexia, selective error, morpheme, mental lexicon, multi-level representational model