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 pseudoextinction. 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.

Del Vicario, V., Actis-Grosso, R., Bolognini, N., Daini, R. (2020). Asymmetrical Pseudo-Extinction Phenomenon in the Illusory Line Motion. SYMMETRY, 12(8), 1-18 [10.3390/sym12081322].

Asymmetrical Pseudo-Extinction Phenomenon in the Illusory Line Motion

Rossana Actis-Grosso
Secondo
;
Nadia Bolognini
Penultimo
;
Roberta Daini
Ultimo
2020

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 movement, even in the presence of bilateral symmetrical cues. We have classified this phenomenon as one of pseudoextinction. 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.
Articolo in rivista - Articolo scientifico
Illusory line motion; pseudo-extinction; exogenous attention; superior colliculus
English
2020
12
8
1
18
1322
open
Del Vicario, V., Actis-Grosso, R., Bolognini, N., Daini, R. (2020). Asymmetrical Pseudo-Extinction Phenomenon in the Illusory Line Motion. SYMMETRY, 12(8), 1-18 [10.3390/sym12081322].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/283389
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