Abstract
When people write the same kana character repeatedly as fast as possible, they sometimes mistakenly write other characters that they do not intend to write. This type of error is known as a writing slip (Nihei, 1984; 1990). Previous studies reported certain characters induce writing slips. The present study investigated the relationship between target characters and mistaken characters in terms of the kinematic and visual similarity. As a measure of the kinematic similarity, we used the similarity in trajectory and velocity. We defined visual similarity based on the questionnaire responses. In the experiment, participants most frequently slipped to write 'o' when they intended to write 'a'. Their visual similarity was very high, whereas the kinematic similarity was low. The result suggests the visual similarity affects the occurrence of writing slips to a much greater extent than the kinematic similarity.
