A
Connectionist Approach to Japanese Kanji Word Naming
M. Ijuin, T. Fushimi, K. Patterson & I. Tatsumi |
Connectionist
approaches have been providing new views for understanding both normal
and disordered reading processes (e.g., Seidenberg & McClelland,
1989; Plaut, McClelland, Seidenberg, & Patterson, 1996). The
present research was designed to simulate normal naming processes
of Japanese Kanji words using a connectionist network. The network
was trained to map the orthography of two-character Kanji words onto
their pronunciations or phonology. Each Kanji character was represented
by a 16 x 16 grid pattern on the input layer, and the word's phonology
at the output layer consisted of phonological codes for the two component
Kanji characters. The training corpus included 4,136 two-character
Kanji-words with frequencies higher than four occurrences per million.
After 900 training epochs, the network could correctly name 99.8
~ of the 4,136 words, including those with inconsistent or atypical
character-sound correspondences. In terms of efficiency of word naming,
the network showed frequency and consistency effects and an interaction
between these variables, largely comparable to these effects in the
naming latencies of Japanese skilled readers (Fushimi, Ijuin, Patterson, & Tatsumi,
1999). On the other hand, when naming nonwords, the network's performance
was substantially worse than that of skilled readers. Properties
of the connectionist approach for Japanese Kanji word naming are
discussed. Key words: connectionist model, Japanese kanji, naming, consistency effect |