Summation of two illusions of extent

Bertulis, Algis; Surkys, Tadas; Bielevičius, Arūnas

doi:10.21307/ane-2018-014

Cited by 2 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The individual IO-K functions (Fig. 3) exposed a common non-monotonic profile as well, irrespective of wide dispersion in the illusion strength, which may have primarily been caused by the individual properties of the visual signal processing (Bertulis et al, 2018).…”

Section: Methodsmentioning

confidence: 93%

“…Both factors were perceptually significant. Importance of the contours was emphasized during testing of the superposed O-K figures comprising a regular sequence of uniform filling stripes, a contour rectangle, or a solid block (Bertulis et al, 2014), and also in an examination of the expansion effect produced by the Müller-Lyer wings attached to the O-K pattern with either spots or high stripes (Bertulis et al, 2018). The next excitation factor, the filling mode, mattered to the illusion as well.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Oppel-Kundt illusion balance

Bertulis¹,

Surkys²,

Bielevičius³

2020

Acta Neurobiologiae Experimentalis

Self Cite

View full text Add to dashboard Cite

Perceptual estimates of spatial dimensions of visual objects depend on their shape and surface attributes. The present psychophysical study emphasizes two main contributors to the Oppel-Kundt illusion: the outline of the filled space and the mode of filling. In past experiments, both factors have been considered significant. Our experiments were performed by using combined stimuli of the Oppel-Kundt figures and supplementary objects situated within the empty intervals of the figures. Line segments, empty and filled rectangles, blurred contours, and grey and color images were used for the supplementary stimuli role. The experimental data demonstrated an innate property of the objects to balance the illusion of distance if they were placed within the Oppel-Kundt figure and to create an illusion of extent when compared with an empty space interval. Both the balance magnitude and the induced illusion strength varied depending on the objects' spatial structure. The supplementary objects showed a tendency to differ from each other by their functional capacity and were ranked from lowest to highest: a line segment, a solid bar with a blurred outline, a contour of a rectangle, a solid fill rectangle, greyscale patterns, and color pictures. The experimental findings provided support for an explanation of the Oppel-Kundt illusion in terms of the spatial-temporal summation of excitations representing the object outline and surface attributes at the lower cortical levels of the visual system. Along with the facts already established in current literature, the experimental data gave rise to the assumption that any visual object could appear larger than its occupied area, and that the Oppel-Kundt illusion could become a separate case in the common sensory phenomenon of object size illusion.

show abstract

Section: Methodsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Oppel-Kundt illusion balance

Bertulis¹,

Surkys²,

Bielevičius³

2020

Acta Neurobiologiae Experimentalis

Self Cite

View full text Add to dashboard Cite

show abstract

“…In both perceptual domains, these illusions have versions where multiple fillers make a continuous perceptual object and are referred to as filled duration (Grondin et al, 2018) and filled space illusions (Bulatov et al, 2017). In visual perception research, it is known that the combined Oppel-Kundt and Müller-Lyer effects enhance or diminish the overall illusion strength (Bertulis et al, 2018). Bulatov et al (2017) suggested the size-estimation process description with a quantitative model, which explains the Oppel-Kundt illusion and in which the centroid extraction is an inherent component.…”

Section: Discussionmentioning

confidence: 99%

An auditory time perception illusion analogous to the visual Müller‐Lyer illusion

Surkys

2021

Eur J of Neuroscience

Self Cite

View full text Add to dashboard Cite

According to the centroid hypothesis, the visual Müller-Lyer-type illusions in which subjects misperceive lines or gaps as longer or shorter depending on surrounding distracters result from the pooling of positioning neural signals such that the perceived object is shifted towards these distracters. However, it is uncertain if this type of pooling is a more general principal that influences perceptions in other sensory modalities, including time perception based on auditory signals. In this study, I show that by applying the principles of the centroid hypothesis, an audial time duration illusion can be constructed. The perception of two sequential time intervals, which were defined by three short tone signals, was distorted by placing distracting white noise sounds near each signal. Misperception magnitude, which peaked at 31%, changed with the time interval between the tone signals and distracters; the relationship between the target-distracter distance and the illusion strength closely paralleled with that of a Müller-Lyer-type illusion, whereby the visual objects were analogically arranged in space rather than time. These results demonstrate that even if signals and distracters are distinguishable, the neural mechanisms for estimating time duration utilize coarser sampling to preserve processing resources at the expense of high accuracy. I hypothesize that systems that are dedicated to visual length and time duration estimations are based on similar perceptual magnitude evaluation algorithms. Moreover, this signal pooling principle may be applicable to other perceptual modalities across different species.

show abstract

Summation of two illusions of extent

Cited by 2 publications

References 36 publications

Oppel-Kundt illusion balance

Oppel-Kundt illusion balance

An auditory time perception illusion analogous to the visual Müller‐Lyer illusion

Contact Info

Product

Resources

About