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Results for “Distance Perception”

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At least 253 records · Page 14Linked to original sources
PubMed1981

Perception of runway image shape and approach angle magnitude by pilots in simulated night landing approaches.

One cue for visual judgments of glidepath angle has been referred to as form ratio. Form ratio is defined as the ratio of vertical height of the runway to width of the far end in the runway retinal image. The ability of pilots to judge form ratios was compared with the ability to judge approach angles in the nighttime "black hole" situation in two experiments. Responses in both static and dynamic simulated approach conditions indicated a general tendency to overestimate form ratios and approach angles less than 3 degrees. Intersubject and intrasubject variability of form ratio and approach angle responses were comparable. These findings (i) do not support the utility of form ratio judgments as an aid in selecting approach angle, (ii) add to the empirical evidence of visual illusions and the danger of reliance on visual information for judgment of approach angle in the nighttime "black hole" situation where only runway light are visible, and (iii) point to variability in perception of approach angle as an important part of the problem.

Adult↗
PubMed1977

Coordination of vision and prehension in young infants.

Infants aged 3, 5, and 7 months were shown solid objects and comparable intangible images of objects both within and beyond possible arm's reach. The infant's emotional reactions and reaching behavior in the presence of the image stimuli were very similar to their responses to the solid objects. The results do not support the reports of previous studies using a similar tactual-visual conflict situation that young infants become emotionally distressed when presented with discordant visual and tactual information. It was concluded that the initation of reaching attempts by young infants is predominantly visually controlled and any tactual-kinesthetic feedback from prehension seems to produce very little modification of young infants' reaching behavior.

Age Factors↗
PubMedDate not supplied

A partnership model of distance education: students' perceptions of connectedness and professionalization.

This article describes a partnership model of distance education for a master's nursing program in a midwestern state and an evaluation that assessed students' perceptions of professionalization and connectedness in the program. Students at the originating and distance sites were asked to complete evaluations at the end of each course. Connectedness and professionalization were measured using rated satisfaction with three modes of contact for each item. Results indicated that students at the distance site had a significantly higher overall level of satisfaction with interactive television (ITV) and experienced high levels of connectedness and professionalization through the ITV courses. However, among the three modes of connectedness, students at the distance site rated satisfaction with contact with same-site students as the highest, followed by contact with the instructor. Students also perceived that their professional identity increased through the three modes, particularly for contact with same-site peers at the distance site and for contact with instructors at both sites. Recommendations for faculty and student responsibilities are provided to ensure a positive learning environment.

Adult↗
PubMed1999

The perception of tactile distance: influences of body site, space, and time.

Vibrotactile prostheses for deaf or blind persons have been applied to any number of different locations on the body, including the finger, wrist, forearm, abdomen, back, and nape of the neck. The discriminability of patterns presented by such devices can be affected by the acuity of the site of application and the resolution of the display. In addition, the mutual influences among stimuli close together in both space and time can affect percepts within a broad range of parameters. For example, consideration must be given to a variety of tactile illusions often associated with the spatial separations and the range of temporal intervals typically used in cutaneous communication displays. Experiments are reported in which magnitude estimates and cross-modality matches of perceived extent produced by pairs of vibrotactile taps presented to separate loci were obtained on three different body sites. Perceived distance was directly related both to the timing between the taps and to their physical separation. The findings show a consistent relationship to cortical magnification across body sites.

Analysis of Variance↗