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The current experiment tested the aiming accuracy of the eye for targets at nine different positions and of two different sizes. The left eye was tracked to record the line of gaze with an infrared eye-monitoring device. For each subject, horizontal shift, vertical shift, standard deviations of the X and Y coordinates, and 95th percentile of the horizontal and vertical shifts from the nine target centers were calculated to indicate the precision, accuracy, and possible design limits of the gaze points. Analysis showed that the target's position had a strong effect on the vertical shift, standard deviations of the Y coordinate, and 95th percentile of the vertical shift. The effect of target size was not significant on any of the dependent measures. The research findings have important implications for the redesign of the gaze-pointing device. Visual targets appearing below the horizontal line of sight should be larger than those above. based on the 95th percentile of the horizontal and vertical shifts, targets should be approximately 2.0 [degrees] wide and 2.4 [degrees] long above or coinciding with the horizontal line of gaze and 2.6 [degrees] wide and 3.9 [degrees] (cm) long below the horizontal line of gaze.

The current experiment examined the speed-accuracy trade-off of saccadic movement between two targets. Ten subjects looked alternately at two targets as fast and as accurately as possible for 2 min. under different conditions of target size, distance between targets, and direction of eye movement. Saccadic movement of the left eye was tracked and recorded with an infrared eye monitoring device to compute the starting position, ending position, and duration of each saccadic movement. Eye-movement time was significantly related to target size and distance between targets, but the speed-accuracy trade-off was significantly different from that predicted by Fitts' Law. Reaction time was not significantly changed by the direction of eye movement.

32 shy and 32 nonshy women were selected from a population of Japanese junior college students on the basis of their responses to the Trait Shyness Scale. This study manipulated shyness (shy and nonshy), interviewers' gaze (high amount of gaze and low amount of gaze), and interviewers' sex in a 2 X 2 X 2 factorial design. Subjects were randomly assigned to eight groups and interviewed by one of two male or two female confederates. Two trained judges recorded duration of gaze and speech through a one-way mirror and watching videotaped records. Analysis showed that for the interviewer in the high gaze condition the self-reported shy women gazed less while speaking than the nonshy women.

Summary. - 20 extraverts and 20 introverts were selected from a population of college students on the basis of their responses to the Maudsley Personality Inventory. These 40 young women were interviewed by one confederate of each sex. Six trained judges recorded visual and speech behavior by viewing through a one-way mirror and watching videotaped records. Analysis showed that extraverted women engaged in longer gazing than the introverted ones. The extraverted women gazed longer during listening than did introverted women. The proportion of time spent in gazing while speaking was not associated with extraversion. Also, women spent a greater proportion of time looking at a female interviewer than at a male interviewer.

Full-term infants at both 2 and 3 months and preterm ones at 3 months from due date vocalized more to mother than to a stranger and gazed more at a stranger than the mother. Preterm infants at 3 months from birth, but 6 weeks from due date, did not show differential responding by any mode, indicating the importance of maturational rather than environmental factors in these behaviors.