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Article

Asymmetrical Pseudo-Extinction Phenomenon in the Illusory Line Motion

1
Department of Psychology, Università di Milano-Bicocca, 20126 Milano, Italy
2
Milan Center for Neuroscience (NeuroMI), Università di Milano-Bicocca, 20126 Milano, Italy
3
IRCCS Istituto Auxologico Italiano, 20122 Milano, Italy
4
University Research Centre in Optics and Optometry, Università di Milano-Bicocca (COMiB), 20126 Milano, Italy
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(8), 1322; https://doi.org/10.3390/sym12081322
Received: 30 June 2020 / Revised: 4 August 2020 / Accepted: 5 August 2020 / Published: 7 August 2020
(This article belongs to the Special Issue Symmetry and Asymmetry in Brain Behavior and Perception)
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. View Full-Text
Keywords: illusory line motion; pseudo-extinction; exogenous attention; superior colliculus illusory line motion; pseudo-extinction; exogenous attention; superior colliculus
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MDPI and ACS Style

Del Vicario, V.G.; Actis-Grosso, R.; Bolognini, N.; Daini, R. Asymmetrical Pseudo-Extinction Phenomenon in the Illusory Line Motion. Symmetry 2020, 12, 1322. https://doi.org/10.3390/sym12081322

AMA Style

Del Vicario VG, Actis-Grosso R, Bolognini N, Daini R. Asymmetrical Pseudo-Extinction Phenomenon in the Illusory Line Motion. Symmetry. 2020; 12(8):1322. https://doi.org/10.3390/sym12081322

Chicago/Turabian Style

Del Vicario, Vidheya G., Rossana Actis-Grosso, Nadia Bolognini, and Roberta Daini. 2020. "Asymmetrical Pseudo-Extinction Phenomenon in the Illusory Line Motion" Symmetry 12, no. 8: 1322. https://doi.org/10.3390/sym12081322

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