Most Findings Obtained With Untimed Visual Illusions Are Confounded

Bressan, Paola; Krämer, Peter

doi:10.1177/0956797621994268

Cited by 11 publications

(17 citation statements)

References 46 publications

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“…It is therefore a possibility that the illusory stimuli used in this study were more effective during the perceptual comparison task than during the experimental trials, which could also explain the lack of any observed influence of the illusion when acting on the single target. Conversely, as participants were not constrained regarding the amount of time required to perform the perceptual comparisons, it is possible the potential for increased inspection time may have in fact weakened the effect of the illusion for those who spent more time viewing the targets (Bressan and Kramer, 2021).…”

Section: Methodological Considerationsmentioning

confidence: 99%

Use of remote data collection methodology to test for an illusory effect on visually guided cursor movements

Langridge

Marotta

2022

Front. Psychol.

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Investigating the influence of perception on the control of visually guided action typically involves controlled experimentation within the laboratory setting. When appropriate, however, behavioral research of this nature may benefit from the use of methods that allow for remote data collection outside of the lab. This study tested the feasibility of using remote data collection methods to explore the influence of perceived target size on visually guided cursor movements using the Ebbinghaus illusion. Participants completed the experiment remotely, using the trackpad of their personal laptop computers. The task required participants to click on a single circular target presented at either the left or right side of their screen as quickly and accurately as possible (Experiment 1), or to emphasize speed (Experiment 2) or accuracy (Experiment 3). On each trial the target was either surrounded by small or large context circles, or no context circles. Participants’ judgments of the targets’ perceived size were influenced by the illusion, however, the illusion failed to produce differences in click-point accuracy or movement time. Interestingly, the illusion appeared to affect participants’ movement of the cursor toward the target; more directional changes were made when clicking the Perceived Large version of the illusion compared to the Perceived Small version. These results suggest the planning of the cursor movement may have been influenced by the illusion, while later stages of the movement were not, and cursor movements directed toward targets perceived as smaller required less correction compared to targets perceived as larger.

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Section: Methodological Considerationsmentioning

confidence: 99%

Use of remote data collection methodology to test for an illusory effect on visually guided cursor movements

Langridge

Marotta

2022

Front. Psychol.

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“…Recently, Bressan et al, (2021) suggested that, at least in the case of the Ebbinghaus illusion, exposure time to the illusory display is confounded with the illusion's magnitude.…”

Section: Correlations Between Measuresmentioning

confidence: 99%

“…In Experiment 1, the stimuli for each illusion were presented in a typical self-paced manner. In Experiment 2 we employed a fixed presentation duration paradigm (1000ms) in order to control for possible effects of presentation duration that could affect performance for some illusions (Bressan & Kramer, 2021). Based on the combined results of the two experiments, we offer a unified tool to measure the susceptibility and the visual resolution for size for each of the three illusions.…”

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confidence: 99%

The BTPI: An online battery for measuring susceptibility to visual illusions

Mazuz¹,

Kessler²,

Ganel³

2023

Preprint

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Visual illusions provide a powerful tool for probing the mechanisms that underlie perception. While most previous studies of visual illusions focused on average group-level performance, less attention has been devoted to individual differences in susceptibility to illusions. Unlike in other perceptual domains, in which there are established, validated tools to measure individual differences, such tools are not yet available in the domain of visual illusions. Here, we describe the development and validation of the BTPI (Ben-Gurion University Test for Perceptual illusions), a new online battery designed to measure susceptibility to the influence of three prominent size illusions: The Ebbinghaus, the Ponzo, and the height-width illusions. The BTPI also measures perceptual resolution, reflected by the just noticeable difference (JND), to detect size differences in the context of each illusion. In Experiment 1 (N=143), we examined performance in typical self-paced tasks, whereas in Experiment 2 (N=69), we employed a fixed presentation duration paradigm. High test-retest reliability scores were found for all illusions, with little evidence for inter-correlations between different illusions. In addition, lower perceptual resolution (larger JND) was associated with a larger susceptibility to the illusory effect. The computerized task battery and analysis codes are freely available online.

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“…Another crucial, but relatively unchartered territory, is the investigation of how visual illusions are temporally processed. Recent research has shown that the perceived illusion is dependent on inspection time (i.e., for some illusions, a longer time is required to attentionally disregard the biasing context), and that this effect is unique to each illusion (Bressan & Kramer, 2021). The Ponzo illusion, for example, induces illusion susceptibility under presentation times as short as 12 ms (Schmidt & Haberkamp, 2016).…”

Section: Future Plans and Developmentsmentioning

confidence: 99%

A Parametric Framework to Generate Visual Illusions Using Python

et al. 2021

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Visual illusions are fascinating phenomena that have been used and studied by artists and scientists for centuries, leading to important discoveries about the neurocognitive underpinnings of perception, consciousness, and neuropsychiatric disorders such as schizophrenia or autism. Surprisingly, despite their historical and theoretical importance as psychological stimuli, there is no dedicated software, nor consistent approach, to generate illusions in a systematic fashion. Instead, scientists have to craft them by hand in an idiosyncratic fashion, or use pre-made images not tailored for the specific needs of their studies. This, in turn, hinders the reproducibility of illusion-based research, narrowing possibilities for scientific breakthroughs and their applications. With the aim of addressing this gap, Pyllusion is a Python-based open-source software (freely available at https://github.com/RealityBending/Pyllusion ), that offers a framework to manipulate and generate illusions in a systematic way, compatible with different output formats such as image files (.png, .jpg, .tiff, etc.) or experimental software (such as PsychoPy).

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Most Findings Obtained With Untimed Visual Illusions Are Confounded

Cited by 11 publications

References 46 publications

Use of remote data collection methodology to test for an illusory effect on visually guided cursor movements

Use of remote data collection methodology to test for an illusory effect on visually guided cursor movements

The BTPI: An online battery for measuring susceptibility to visual illusions

A Parametric Framework to Generate Visual Illusions Using Python

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