Absence of a numerical memory span advantage in Japanese Kanji

Research suggests that people's memory span for Arabic numerals is consistently greater than that for digit words written in an alphabet, even when these stimuli have been matched for word length, lexicality, and semantics. It is not clear whether this "numeral advantage" holds true for other scripts. The present study tested this possibility in the case of Japanese kanji (the Chinese characters used in Japanese). 23 Japanese adults responded to stimuli comprised of two sets of random number sequences, one set presented in Arabic numerals and the other in digit word kanji. Each set began with three two-item sequences followed by three three-item sequences and so on, until three 12-item sequences were presented. Consecutive repetition of stimuli was avoided. Memory span was measured as the length of the last correctly recalled item sequence. Results indicated no numeral advantage effect, as there was no significant difference between people's recall of numerals and digit words. Memory strategy in dealing with kanji appears to bear more resemblance to numerals than to words in English.