Effects of motion on perceived pointing of ambiguous triangles

Bucher, Nancy M.; Palmer, Stephen

doi:10.3758/bf03207150

Cited by 16 publications

(17 citation statements)

References 14 publications

(30 reference statements)

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“…Does direction of motion influence perceived orientation of symmetric shapes? Bucher and Palmer (1985) showed that people tend to see a triangle pointing in the direction in which it is moving. It suggests that people might see symmetric shapes pointing (thus, oriented) more toward direction of motion.…”

Section: Resultsmentioning

confidence: 99%

“…Whether the biases found in the present study occur at relatively early levels of the visual system or at higher cognitive levels should be resolved by further experiments. Bucher and Palmer (1985) showed that perceived pointing of an equilateral triangle is affected by direction of its motion: When a triangle is moving along one of its three symmetry axes, observers are more likely to see the triangle point in that direction than when it is stationary or moving along a side of the triangle. In axis-aligned motion, motion vectors ofall the points composing the triangle are also symmetric about the axis.…”

Section: Methodsmentioning

confidence: 99%

“…Werkhoven et al (1990) suggested that the dominance of apparent motion parallel to the lines might be explained in terms of characteristics of spatiotemporal filtering in early vision. Bucher and Palmer (1985) speculated that interactions between the shape of a moving object and its perceived orientation might be mediated by low-level motion detectors. On the other hand, real-world regularities ofanimate motion may be represented cognitively at higher levels of visual processing, thus requiring attention.…”

Section: Methodsmentioning

confidence: 99%

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Symmetry and elongation of objects influence perceived direction of translational motion

Morikawa

1999

Perception & Psychophysics

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Five experiments were conducted to examine how perceived direction of motion is influenced by aspects of shape of a moving object such as symmetry and elongation, Random polygons moving obliquely were presented on a computer screen and perceived direction of motion was measured. Experiments 1 and 2 showed that a symmetric object moving off the axis of symmetry caused motion to be perceived as more aligned with the axis than it actually was. However, Experiment 3 showed that motion did not influence perceived orientation of symmetry axis. Experiment 4 revealed that symmetric shapes resulted in faster judgments on direction of motion than asymmetric shapes only when the motion is along the axis. Experiment 5 showed that elongation causes a bias in perceived direction of motion similar to effects of symmetry. Existence of such biases is consistent with the hypothesis that in the course of evolution, the visualsystem has been adapted to regularities of motion in the animate world.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Symmetry and elongation of objects influence perceived direction of translational motion

Morikawa

1999

Perception & Psychophysics

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“…For example, the same pattern can be seen as a square or a diamond, depending on how one assigns the reference frame and the main axis of symmetry (Rock, 1973). Perceived axes of elongation and symmetry are also influenced by motion (Bucher & Palmer, 1985;Rock, 1973;Sekuler & Swimmer, 2000). Adults are biased to see both the main axis of symmetry and the main axis of elongation as parallel to the path of movement (Morikawa, 1999;Sekuler & Swimmer, 2000).…”

Section: Axes Of Elongation and Symmetry Are Important To Object Recomentioning

confidence: 99%

Action Alters Shape Categories

Smith

2005

Cognitive Science

127

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Two experiments show that action alters the shape categories formed by 2-year-olds. Experiment 1 shows that moving an object horizontally (or vertically) defines the horizontal (or vertical) axis as the main axis of elongation and systematically changes the range of shapes seen as similar. Experiment 2 shows that moving an object symmetrically (or asymmetrically) also alters shape categories. Previous work has shown marked developmental changes in object recognition between 1 and 3 years of age. These results suggest a role for action in this developmental process.

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“…Attneave observed that these triangles are perceived alternatively to point in any of these three directions with approximately equal preference. The preferences for these directions have been investigated in relation to motion (Bucher and Palmer 1985), texture (Palmer and Bucher 1982), and configuration (Palmer and Bucher 1981). Spontaneous switching between these directions has been reported for prolonged viewing conditions (Attneave 1968(Attneave , 1971).…”

mentioning

confidence: 99%

Perceptual Switching, Eye Movements, and the Bus Paradox

Ito¹,

Nikolaev²,

Luman³

et al. 2003

Perception

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According to a widely cited finding by Ellis and Stark (1978 Perception7 575–581), the duration of eye fixations is longer at the instant of perceptual reversal of an ambiguous figure than before or after the reversal. However, long fixations are more likely to include samples of an independent random event than are short fixations. This sampling bias would produce the pattern of results also when no correlation exists between fixation duration and perceptual reversals. When an appropriate correction is applied to the measurement of fixation durations, the effect disappears. In fact, there are fewer actual button-presses during the long intervals than would be expected by chance. Moving-window analyses performed on eye-fixation data reveal that no unique eye event is associated with switching behaviour. However, several indicators, such as blink frequency, saccade frequency, and the direction of the saccade, are each differentially sensitive to perceptual and response-related aspects of the switching process. The time course of these indicators depicts switching behaviour as a process of cascaded stages.

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Effects of motion on perceived pointing of ambiguous triangles

Cited by 16 publications

References 14 publications

Symmetry and elongation of objects influence perceived direction of translational motion

Symmetry and elongation of objects influence perceived direction of translational motion

Action Alters Shape Categories

Perceptual Switching, Eye Movements, and the Bus Paradox

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