For effective display and transmission of visual images, understanding human visual information processing mechanisms in the brain is very important. In this paper, various aspects of eye movement are investigated to clarify the mechanisms such as recent studies at ATR. Head and eye coordination for the gaze control, binocular eye movement and stereopsis, processing during a single fixation, and a fractal dimension analysis of miniature eye movement are described.

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Three kinds of frequency distributions of human eye movements - fixation times, distances between fixation points and moving velocities - for some TV pictures were measured using the limbus boundary detection method by co-operation of five young students. As a result, several remarkable characteristics and individual differences of eye movements between subjects were obtained from these experiments.

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In multimedia information retrieval, we need keyword retrieval and browsing retrieval. The former is used in searching clear information or narrowing down a great deal of information. The latter is used in information skimming. It's an action of information retrieval which arouse users' interest while they look around for a vague purpose from among information narrowed down to a certain extent. We must solve a lot of technical problems in both presentation methods and manipulation methods in order to realize browsing retrieval on a computer. In this paper, we concentrate on the presentation methods. We will report that as the first step toward ahievement, we carried out the experiments to lead an attention while information was showed and confirmed the usefulness of an attention guide.

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Perception of the moved distance of a target during a head movement was studied. In experiment 1, the differences of mean perceived distances of moving targets in a head-stationary condition and in head-moving conditionsions were examined. Next, in experiment 2, the perceived positions of start and end points of the movements, and perceived moved distances of the stimulus were examined. In experiment 3, perceived velocities and durations of moving targets were examined additionally. These results indicated that there is no effect of a head movement on perception of the moved distances. Although, perceived positions, velocities, and durations were affected by a head movement. The influences of the sizes of head or eye movements, and the directions of eye movements relative to head movements were discussed

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