Distortions of length perception

Bulatov, Aleksandr; Bertulis, Algis

doi:10.1007/s004220050516

Cited by 21 publications

(21 citation statements)

References 25 publications

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“…In our previous seeking of underlying principles behind the misperception of extent (Bulatov et al 1997, Bulatov and Bertulis 1999, the main attention was drawn to the cortical processes of spatial-frequency filtering. Since the computational procedures of the current model represent some calculations of convolution and spatial integration, it can be considered as a further development of the "filtering" hypothesis.…”

Section: Discussionmentioning

confidence: 99%

“…According to the "contour density" hypothesis (Craven andWatt 1989, Watt 1990), the number of zero-crossings of the spatial profile of neural excitation caused by the filled part of the Oppel-Kundt figure can be one of the most important factors determining the illusion magnitude. A rather adequate description of illusory effects was obtained from the computational model seeking to explain the misperception of extent in terms of physiological (i.e., based on the spatial properties of the receptive fields of neurons in the primary visual cortex) spatial-frequency filtering (Bulatov et al 1997, Bulatov and Bertulis 1999, as well as from the quantitative approach that explains the illusion occurrence by internal noises in the neural networks (Fermüller and Malm 2004).…”

Section: Introductionmentioning

confidence: 99%

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An effect of continuous contextual filling in the filled‑space illusion

Bulatov¹,

Bulatova²,

Surkys³

et al. 2017

Acta Neurobiologiae Experimentalis

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In the filled-space (or Oppel-Kundt) illusion, the filled part of the stimulus for most observers appears longer in comparison with the empty one. In the first two experimental series of the present study, we investigated the illusory effect as a function of continuous filling (by a shaft-line segment) of the reference spatial interval of the three-dot stimulus. It was demonstrated that for the fixed length of the reference interval, the magnitude of the illusion increases non-linearly with the shaft length. For the fixed length of the shaft, the illusion magnitude gradually decreases with the lengthening of the reference interval. In the third series, psychophysical examination of the conventional Oppel-Kundt stimulus with different number of equally spaced elements (dots) subdividing its filled part was performed. Based on the analysis of the functional dependencies established, we have proposed a simple computational model that was successfully applied to fit the experimental data obtained in the present study.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An effect of continuous contextual filling in the filled‑space illusion

Bulatov¹,

Bulatova²,

Surkys³

et al. 2017

Acta Neurobiologiae Experimentalis

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“…This illusion has been widely studied, both in two-(e.g. Bulatov and Bertulis 1999;Bulatov et al 1997;Coren and Girgus 1978;Giora and Gori 2010) and three-dimensional space (Deregowsky and McGeorge 2006). It has been found that its strength varies as a function of several characteristics of the stimulus, such as size, orientation and the number of Wlling lines (e.g.…”

Section: Introductionmentioning

confidence: 97%

“…It has been found that its strength varies as a function of several characteristics of the stimulus, such as size, orientation and the number of Wlling lines (e.g. Bulatov and Bertulis 1999;Bulatov et al 1997;Coren and Girgus 1978) and, more generally, of the textural statistical properties of the visual object (Giora and Gori 2010). Importantly, the OKI consistently produced a distortion of space orthogonal to the Wlling lines' orientation: that is, when vertical lines are presented, the space is overestimated along its horizontal extent.…”

Section: Introductionmentioning

confidence: 99%

Reaction times and perceptual adjustments are sensitive to the illusory distortion of space

et al. 2012

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The Oppel-Kundt illusion (OKI) consists of the perception of a filled space as larger than an empty space of the same size. Here, we used a modified version of that illusion composed of a gradient of vertical lines whose spacing decreased progressively from one side to the other: space is expected to be perceived as larger where the lines are more compressed. We tested the hypothesis that a horizontal stimulus presented in a space perceived as larger will produce faster RTs by asking forty-four healthy subjects to respond as quickly as possible to lateralized stimuli (horizontal bars, vertical bars and circles) presented on different backgrounds (control condition: evenly spaced vertical lines or an empty space; illusory conditions: vertical lines progressively compressed to the right or the left). Subjects' RTs were reliably faster for horizontal stimuli presented on the space perceived as larger than on the space perceived as smaller. To verify that this effect was actually due to a size illusion, the same subjects were asked to adjust the size of the stimuli presented on the same backgrounds as to make them equal to a reference stimulus. For horizontal stimuli, subjects produced adjustments in accordance with the predicted effect of the illusion. Together, these data show that the OKI produces a distortion of space that extends to stimuli placed in front of it and that RTs are influenced by the perceived and not the physical size of the stimuli. Implications for neural bases of illusions and for spatial neglect are discussed.

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“…This fact may be explained by meridional anisotropy of the visual field, detected by numerous tests [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], and sophisticated processes at higher levels of the visual system [8]. In addition, sensitivity to orientation may be determined by the perception of the direction of gravity [1,24].…”

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confidence: 99%

Discrimination of a Right Angle with Monocular and Cyclopic Perception

Bulatov¹,

Bertulis²,

Bulatova³

2005

Hum Physiol

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Psychophysical tests with monocular and cyclopic perception were carried out to evaluate the accuracy of discrimination of right, acute, and obtuse angles. Tests with monocular perception were carried out with stimuli made by light line segments, spots, or elements of the Oppel-Kundt and Muller-Lyer figures. In tests with cyclopic perception, pairs of V-shaped stimuli with an identical orientation in the visual field and equal length of the sides but different divergence angles were presented to the different eyes of subjects. The test data demonstrated features of the perception of a right angle, namely, a high accuracy of reproduction, periodicity of errors as a function of the general orientation of a stimulus, similar characteristics of the manifestation of geometric illusions in angle reproduction and length comparison, and the manifestation of Hering's law in cyclopic perception. These results agree with the multilocal hypothesis, which explains the perception of right and other angles on the basis of the information about the coordinates of stimulus parts.

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Distortions of length perception

Cited by 21 publications

References 25 publications

An effect of continuous contextual filling in the filled‑space illusion

An effect of continuous contextual filling in the filled‑space illusion

Reaction times and perceptual adjustments are sensitive to the illusory distortion of space

Discrimination of a Right Angle with Monocular and Cyclopic Perception

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