Pupil diameters were recorded with an eye-tracker while participants observed cruciform patterns of gray-scale gradients that evoked illusions of enhanced brightness (glare) or of enhanced darkness. The illusions were either presented as static images or as dynamic animations which initially appeared as a pattern of filled squares that—in a few seconds—gradually changed into gradients until the patterns were identical to the static ones. Gradients could either converge toward the center, resulting in a central region of enhanced, illusory, brightness or darkness, or oriented toward each side of the screen, resulting in the perception of a peripheral ring of illusory brightness or darkness. It was found that pupil responses to these illusions matched both the direction and intensity of perceived changes in light: Glare stimuli resulted in pupil constrictions, and darkness stimuli evoked dilations of the pupils. A second experiment found that gradients of brightness were most effective in constricting the pupils than isoluminant step-luminance, local, variations in luminance. This set of findings suggest that the eye strategically adjusts to reflect in a predictive manner, given that these brightness illusions only suggest a change in luminance when none has occurred, the content within brightness maps of the visual scene
Zavagno, D., Tommasi, L., & Laeng, B. (2017). The Eye Pupil’s Response to Static and Dynamic Illusions of Luminosity and Darkness. I-PERCEPTION, 1-15.
Citazione: | Zavagno, D., Tommasi, L., & Laeng, B. (2017). The Eye Pupil’s Response to Static and Dynamic Illusions of Luminosity and Darkness. I-PERCEPTION, 1-15. |
Tipo: | Articolo in rivista - Articolo scientifico |
Carattere della pubblicazione: | Scientifica |
Presenza di un coautore afferente ad Istituzioni straniere: | Si |
Titolo: | The Eye Pupil’s Response to Static and Dynamic Illusions of Luminosity and Darkness |
Autori: | Zavagno, D; Tommasi, L; Laeng, B |
Autori: | |
Data di pubblicazione: | 2017 |
Lingua: | English |
Rivista: | I-PERCEPTION |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1177/2041669517717754 |
Appare nelle tipologie: | 01 - Articolo su rivista |
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