Size distance relationship perception and attention

size distance relationship perception and attention

It is asserted that perceived relative size and distance are the primary . considerable experimental attention (OSGOOD (), WOODWORTH () and WOOD- Even for the observers who evidenced some relation between convergence. Perspective space predicts that perceived distance and size as a function of properties of perspective space in relation to distance and size perception and to Attention, Perception, & Psychophysics, 74, – Perception & Psychophysics. July , Volume 37, Issue 4, pp – | Cite as. On size, distance, and visual angle perception with the perceived distance variable (D'), they use only one “perceived size” . on the relationship between stimulus size and perceived distance. . Attention and saccadic eye movements.

Perspective Space as a Model for Distance and Size Perception

The conclusion is that perspective space unifies a number of models of distance and size perception. Physical space is homogeneous and isotropic within the extent of human vision, implying that objects do not change in size or form under translation and rotation.

Visual space is the extent that we, that is, human beings, perceive through vision. Visual space differs from physical space, especially at long viewing distances. It is neither homogeneous nor isotropic, implying that objects are perceived to change in size or form under translation and rotation. Perspective space has been proposed as a model of visual space Erkelens, a ; Gilinsky, ; Hatfield, Gilinsky introduced the model to describe empirical data of distance and size perception.

The single parameter of the model, that is, the distance of the vanishing point was inferred to be about 30 m or more.

Erkelens a used perspective space to describe perspective angles, that is, angles perceived between parallel lines in physical space. Distances of the vanishing point inferred from perspective angles were shorter than 6 m. The large difference between the distances of vanishing points in the two studies suggests that the models of Gilinsky and Erkelens have different geometries. An alternative explanation is that perceived distances and angles cannot be described by a single perspective space.

The purpose of this study is to investigate properties of perspective space in relation to distance and size perception and to compare the models of Gilinsky and Erkelens with each other and with other models of distance and size perception. Research of distance and size perception has a long history for a comprehensive review see Wagner, The extensive literature on the topic presents a plethora of experimental results, which together do not seem to go well with a specific geometry of visual space.

Wagner championed the idea, less remote from the intuitive notion of a visual space, that we should see visual space as a family of spaces whose individual geometries differ from each other depending on experimental conditions and mental shifts in the meaning of size and distance.

This study will show that perspective space is such a family of spaces. Perspective space will prove to be an attractive model for distance and size perception because it fits well to many experimental results and unifies a number of existing models.

Images from the two eyes differ.

size distance relationship perception and attention

Try looking at your two index fingers when pointing them towards each other half an inch apart and about 5 inches directly in front of your eyes.

When two eyes move inward towards the nose to see near objects and outward away from the nose to see faraway objects. If two objects are similar in size, we perceive the one that casts a smaller retinal image to be farther away.

Perception Chapter 6.

Objects that occlude block other objects tend to be perceived as closer. Photo by Richard Carafelli.

10 Signs of True Love in a Long Distance Relationship

Because light from distant objects passes through more light than closer objects, we perceive hazy objects to be farther away than those objects that appear sharp and clear. Nearby objects reflect more light into our eyes than more distant objects. Given two identical objects, the dimmer one appears to be farther away. Indistinct fine texture signals an increasing distance. We perceive objects that are higher in our field of vision to be farther away than those that are lower.

Image courtesy of Shaun P. Objects closer to a fixation point move faster and in opposing direction to those objects that are farther away from a fixation point, moving slower and in the same direction. Parallel lines, such as railroad tracks, appear to converge in the distance.

Perspective Space as a Model for Distance and Size Perception

The more the lines converge, the greater their perceived distance. Objects traveling towards us grow in size and those moving away shrink in size.

size distance relationship perception and attention

The same is true when the observer moves to or from an object. When lights flash at a certain speed they tend to present illusions of motion. Neon signs use this principle to create motion perception.