Using eye height in different postures to scale the heights of objects.

Wraga, Maryjane

doi:10.1037/0096-1523.25.2.518

Cited by 47 publications

(81 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If attended to, the texture information would have conflicted with EH information, thus reducing its effect. This hypothesis is supported by the results of recent studies on the effects of posture on perceived size (Wraga, 1999). Under monocular experimental conditions comparable with the present research, participants judged the height of rectangular targets in several postures, including seated, standing, and lying prone.…”

Section: Discussionsupporting

confidence: 80%

The role of eye height in perceiving affordances and object dimensions

Wraga

1999

Perception & Psychophysics

Self Cite

107

103

View full text Add to dashboard Cite

In four experiments on perceived object height and width, the effects of shifting participants' effective eye height (EEH) on affordance (intrinsic) and apparent size (extrinsic) judgments were contrasted. In Experiment 1, EEH shifts produced comparable overestimations of height in intrinsic and extrinsic tasks. A similar result was found with a more abstract extrinsic height task (Experiment 2). However, Experiment 3 revealed a dissociation between intrinsic and extrinsic tasks of perceived width. Mfordance judgments were affected by EEH shifts, whereas apparent size judgments were not. Experiment 4 compared participants' performance on comparable extrinsic tasks of height and width. Height judgments were affected by EEH shifts, but width judgments were again unaffected. It is concluded that eye height may be a more natural metric for object height than for width. Moreover, this difference reflects a basic flexibility within the human visual system for selectively attuning to the most accessible sources of size information.

show abstract

Section: Discussionsupporting

confidence: 80%

The role of eye height in perceiving affordances and object dimensions

Wraga

1999

Perception & Psychophysics

Self Cite

107

103

View full text Add to dashboard Cite

show abstract

“…The discrimination judgment is easier in panel C than in panel B, because the heights of the target poles differ categorically relative to eye height: One is taller, the other shorter used for scaling. This claim is consistent with research by Wraga (1999), who found that object height was scaled to EH when participants were seated and standing, but not when participants were lying on the ground. Additionally, individuals do not use EH to scale object height when they do not perceive themselves to be immersed in the scene.…”

Section: Eye-height Scaling In Perceptionsupporting

confidence: 81%

“…A = height from the observer's EH to the top of the object, B = observer EH, a = visual angle subtended by the top of the object to the observer's EH, and b = visual angle from the observer's EH to the ground. Adapted from Wraga (1999) Fig. 1 Three situations of varying difficulty for making relative height judgments.…”

Section: Eye-height Scaling In Perceptionmentioning

confidence: 99%

Memory for target height is scaled to observer height

2011

View full text Add to dashboard Cite

According to the embodied approach to visual perception, individuals scale the environment to their bodies. This approach highlights the central role of the body for immediate, situated action. The present experiments addressed whether body scaling-specifically, eyeheight scaling-occurs in memory when action is not immediate. Participants viewed standard targets that were either the same height as, taller than, or shorter than themselves. Participants then viewed a comparison target and judged whether the comparison was taller or shorter than the standard target. Participants were most accurate when the standard target height matched their own heights, taking into account postural changes. Participants were biased to underestimate standard target height, in general, and to push standard target height away from their own heights. These results are consistent with the literature on eye-height scaling in visual perception and suggest that body scaling is not only a useful metric for perception and action, but is also preserved in memory.

show abstract

“…Since there are nonvisual sources of information for eye height [Wraga 1999], we eliminated texture on the hallway floors that would generate visible flow. In our displays, the only textured surfaces generating visible flow were the hallway walls.…”

Section: Visual Stimulusmentioning

confidence: 99%

Calibration of locomotion resulting from visual motion in a treadmill-based virtual environment

Mohler

Thompson

Creem-Regehr

et al. 2007

ACM Trans. Appl. Percept.

View full text Add to dashboard Cite

This paper describes the use of a treadmill-based virtual environment (VE) to investigate the influence of visual motion on locomotion. First, we establish that a computer-controlled treadmill coupled with a wide field of view computer graphics display can be used to study interactions between perception and action. Previous work has demonstrated that humans recalibrate their visually directed actions to changing circumstances in their environment. Using a treadmill VE, we show that recalibration of action is reflected in the real world as a result of manipulating the relation between the visual indication of speed, presented using computer graphics, and the biomechanical speed of walking on a treadmill. We then extend this methodology to investigate whether the recalibration is based on perception of the speed of movement through the world or on the magnitude of optic flow itself. This was done by utilizing two different visual displays, which had essentially the same magnitude of optic flow, but which diffe red in the information present for the speed of forward motion. These results indicate that changes in optic flow are not necessary for recalibration to occur. The recalibration effect is dependent, at least in part, on visual perception of the speed of self-movement

show abstract

Using eye height in different postures to scale the heights of objects.

Cited by 47 publications

References 17 publications

The role of eye height in perceiving affordances and object dimensions

The role of eye height in perceiving affordances and object dimensions

Memory for target height is scaled to observer height

Calibration of locomotion resulting from visual motion in a treadmill-based virtual environment

Contact Info

Product

Resources

About