[en] We tested the effects of using a prosthesis for substitution of vision with audition (PSVA) on sensitivity to the Ponzo illusion. The effects of visual experience on the susceptibility to this illusion were also assessed. In one experiment, both early-blind and blindfolded sighted volunteers used the PSVA to explore several variants of the Ponzo illusion as well as control stimuli. No effects of the illusion were observed. The results indicate that subjects focused their attention on the two central horizontal bars of the stimuli, without processing the contextual cues that convey perspective in the Ponzo figure. In a second experiment, we required subjects to use the PSVA to consider the two converging oblique lines of the stimuli before comparing the length of the two horizontal bars. Here we were able to observe susceptibility to the Ponzo illusion in the sighted group, but to a lesser extent than in a sighted non-PSVA control group. No clear effect of the ilusion was obtained in early-blind subjects. These results suggest that, at least in sighted subjects, perception obtained with the PSVA shares perceptual processes with vision. Visual experience appears mandatory for a Ponzo illusion to occur with the PSVA.
Disciplines :
Psychologie cognitive & théorique
Auteur, co-auteur :
Renier, L.
Laloyaux, Cédric ; Université de Liège - ULiège > Département des sciences cognitives > Psychologie cognitive
Collignon, O.
Tranduy, D.
Vanlierde, A.
Bruyer, R.
De Volder, A. G.
Langue du document :
Anglais
Titre :
The Ponzo illusion with auditory substitution of vision in sighted and early-blind subjects.
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