Abstract
Normal hearing people who study signed language that deaf people use in a everyday communication are increasing in number due to the recognition of social. In this paper, we make experiments to collect data for the effect of slow playback of signing motion on language perception. We consider certain conditions on playback speed, and picture quality. The subjects are students who learns signed language for some years, and do not have any experience in learning it. The results show useful effect of slow playback in perception of signed language expressions (sign words).