The purpose of the present study is to investigate effects of orthographic information of stimulus items on the long-term memory. In Experiment I, an incidental learning paradigm was employed in which 24 undergraduates were asked to perform a semantic or a structural orienting task. The levels-of-processing effect was observed for both recall and orthographic recognition tests. In the orthographic recognition test where a target word was presented in
Kanji and
Hiragana, subjects were required to judge which mode was the same as the one used for the encoding phase. In both semantic and structural conditions, recognition scores were found significantly higher than the chance levels. This results implied that orthographic information is stored in long-term memory when information is processed. Experiment II, in which availability of orthographic information was manipulated using 16 undergraduates as subjects, demonstrated that appropriate orthographic information facilitates recognition performance and reduces reaction time. These results provided some support for the dual process model of recognition in which the detection of familiarity and the utilization of retrieval are postulated as basic mechanisms of recognition.
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