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Keywords = illusory line motion

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19 pages, 3757 KiB  
Article
Asymmetrical Pseudo-Extinction Phenomenon in the Illusory Line Motion
by Vidheya G. Del Vicario, Rossana Actis-Grosso, Nadia Bolognini and Roberta Daini
Symmetry 2020, 12(8), 1322; https://doi.org/10.3390/sym12081322 - 7 Aug 2020
Viewed by 2742
Abstract
Illusory Line Motion (i.e., a static line, presented after a lateral cue, is perceived as movement in the opposite direction to the cue) has been used to study a phenomenon of perceptual asymmetry. We have demonstrated the presence of an illusion of leftward [...] Read more.
Illusory Line Motion (i.e., a static line, presented after a lateral cue, is perceived as movement in the opposite direction to the cue) has been used to study a phenomenon of perceptual asymmetry. We have demonstrated the presence of an illusion of leftward movement, even in the presence of bilateral symmetrical cues. We have classified this phenomenon as one of pseudo-extinction. The paradigm of the four experiments performed was always the same: a white line, briefly presented alone or preceded by one or two lateral cues (150 ms), was judged by a group of young participants to be moving either to one side or the other. The asymmetrical effect in the bilateral cue condition was observed with horizontal lines (Experiment 1 and 4), and not with vertical or oblique (Experiment 2 and 3). These results suggest that the effect is linked to the asymmetry of the horizontal spatial planum and the mechanisms of spatial attention. Experiment 4 verified whether the Illusory Line Motion involves the collicular pathway by using blue stimuli for the cues, which activate less the Superior Colliculus (SC), with negative results. We interpreted the asymmetrical pseudo-extinction phenomenon in terms of a right-space exogenous attention advantage. Full article
(This article belongs to the Special Issue Symmetry and Asymmetry in Brain Behavior and Perception)
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40 pages, 6782 KiB  
Article
Cancelling Flash Illusory Line Motion by Cancelling the Attentional Gradient and a Consideration of Consciousness
by Katie McGuire, Amanda Pinny and Jeff P. Hamm
Vision 2019, 3(1), 3; https://doi.org/10.3390/vision3010003 - 10 Jan 2019
Cited by 2 | Viewed by 3727
Abstract
Illusory line motion (ILM) refers to the perception of motion in a line that is, in fact, presented in full at one time. One form of this illusion (flashILM) occurs when the line is presented between two objects following a brief [...] Read more.
Illusory line motion (ILM) refers to the perception of motion in a line that is, in fact, presented in full at one time. One form of this illusion (flashILM) occurs when the line is presented between two objects following a brief luminance change in one of them and flashILM is thought to result from exogenous attention being captured by the flash. Exogenous attention fades with increasing delays, which predicts that flashILM should show a similar temporal pattern. Exogenous attention appears to follow flashILM to become more or less equally distributed along the line.The current study examines flashILM in order to test these predictions derived from the attentional explanation for flashILM and the results were consistent with them. The discussion then concludes with an exploratory analysis approach concerning states of consciousness and decision making and suggests a possible role for attention. Full article
(This article belongs to the Special Issue Visual Orienting and Conscious Perception)
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