Visual information for object identity in apparent movement

Warren, William H.

doi:10.3758/bf03214238

Cited by 19 publications

(34 citation statements)

References 15 publications

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“…The two figures depict two perspective views of the same three-dimensional object (a side view of this object is given in Figure Ic The same transformability relation holds for the hexagon-triangle pair in Warren (1977), Figure 1k. An object does exist such that the two shapes are perspective views thereof, separated by a small movement of the object.…”

Section: Eg In Figures Ih and Ii) Figures La And 1bmentioning

confidence: 93%

“…A recent paper published in this journal (Warren, 1977)argued that two stimuli in apparent motion are perceived as a single object if and only if one is "ecologically transformable" into the other.…”

Section: Transformability and Object Identitymentioning

confidence: 99%

“…Since ecological transformations are those produced by the perspective projection of moving objects, two views that represent the same threedimensional object before and after a slight movement should inevitably be considered ecologically transformable (this criterion is used in Warren (1977)…”

Section: Transformability and Object Identitymentioning

confidence: 99%

“…The distinction between valid and invalid ecological transformation was further attempted in Warren (1977) by contrasting a square changing into a trapezoid with a square changing into a rectangle. It was argued that only the first transformation is "ecologically valid," since a tilted rectangle really exhibits both horizontal contraction and line convergence (p. 267).…”

Section: Eg In Figures Ih and Ii) Figures La And 1bmentioning

confidence: 99%

“…One of the stimulus pairs used in Warren (1977) (Figure lj) comprised a triangle and a square of about 0.5 deg of visual angle. Are they really "ecologically nontransformable" as claimed in Warren (1977)?…”

Section: Transformability and Object Identitymentioning

confidence: 99%

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Transformability and object identity

Ullman

1977

Perception & Psychophysics

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Section: Eg In Figures Ih and Ii) Figures La And 1bmentioning

confidence: 93%

Section: Transformability and Object Identitymentioning

confidence: 99%

Section: Transformability and Object Identitymentioning

confidence: 99%

Section: Eg In Figures Ih and Ii) Figures La And 1bmentioning

confidence: 99%

Section: Transformability and Object Identitymentioning

confidence: 99%

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Transformability and object identity

Ullman

1977

Perception & Psychophysics

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Does the visual system exploit projective geometry to help solve the motion correspondence problem?

1999

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Projective geometry determines how the retinal image of an object deforms as it moves through three-dimensional space. Does the visual system use constraints derived from this information, such as rigidity, to aid the tracking of moving objects? A novel psychophysical technique is introduced for assessing which of two competing motion transformations is 'preferred' by the visual system, in a two-frame sequence. In the first experiment, relative preference strengths for translations parallel and perpendicular to the major axis of a wire-frame object were measured by pitting the two against each other. It was found that parallel translations were preferred to perpendicular ones. On the basis of these data a proximity measure for normalising different transformations, independent of any effects of figural similarity, was developed. In the second experiment, two wire-frame planar structures were used to pit one of five transformations (rotation, expansion, vertical expansion, shear and random jitter) against a translation. Preference strength was measured as the translation distance at which the transformation and the translation were perceived with equal frequency. The PSEs were found to collapse on to a single line when plotted against the proximity magnitude, with the exception of a residual preference for pure translation over all other transformations. In general, these results suggest that preference strength for moving wire-frame figures is determined primarily by the proximity of local features on the displacing contour, with little regard for the projective shape transformation.

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On the Need for A General Quantitative Theory of Pattern Similarity

Townsend

Thomas

1993

Foundations of Perceptual Theory

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Visual information for object identity in apparent movement

Cited by 19 publications

References 15 publications

Transformability and object identity

Transformability and object identity

Does the visual system exploit projective geometry to help solve the motion correspondence problem?

On the Need for A General Quantitative Theory of Pattern Similarity

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