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Effect of perceived length on numerosity estimation: Evidence from the Müller-Lyer illusion

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Dormal, Valérie [UCL] Larigaldie, Nathanaël [UCL] Lefèvre, Nathalie [UCL] Pesenti, Mauro [UCL] Andres, Michael [UCL]

Previous studies showed that the magnitude information conveyed by sensory cues, such as length or surface, influences the ability to compare the numerosity of sets of objects. However, the perceptual nature of this representation and how it interacts with the processes involved in numerical judgements remain unclear. This study aims to address these issues by studying the interference of length on numerosity under different perceptual and response conditions. The first experiment shows that the influence of length does not depend on the actual length but on subjective values reflecting the way length is perceived in a given visual context. The Müller-Lyer illusion was used to manipulate the perceived length of two dot arrays independently of their actual length. When the length of two dot arrays was equal but perceived as different due to the illusion, participants erroneously reported differences in the number of dots contained in each array, evidencing a similar effect of Müller-Lyer illusion on length and numerosity comparison. This finding was replicated in a second experiment where participants had to give a verbal estimate of the number of dots contained in a given array, thereby eliminating the choice between a small or large response. Compared with a neutral condition, estimations were systematically larger than the actual number of dots as the illusory length increased. These results demonstrate that the illusory-induced experience of length influences numerosity estimation over and beyond objective cues and that this influence is not a response selection bias.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2018
Language Anglais
Journal information "Quarterly Journal of Experimental Psychology" - Vol. 71, no. 10, p. 2142-2151 (2018)
Peer reviewed yes
Publisher SAGE Publications
issn 1747-0218
e-issn 1747-0226
Publication status Publié
Affiliations UCL - SSH/IPSY - Psychological Sciences Research Institute
UCL - SSH/IMMAQ/SMCS-Support en méthodologie et calcul statistique (plate-forme technologique)
UCL - SSS/IONS/COSY - Systems & cognitive Neuroscience
Keywords Experimental and Cognitive Psychology ; Physiology (medical) ; Physiology ; General Psychology ; Neuropsychology and Physiological Psychology ; General Medicine ; Visual Illusion ; Numerical Cognition
Links
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Bibliographic reference Dormal, Valérie ; Larigaldie, Nathanaël ; Lefèvre, Nathalie ; Pesenti, Mauro ; Andres, Michael. Effect of perceived length on numerosity estimation: Evidence from the Müller-Lyer illusion. In: Quarterly Journal of Experimental Psychology, Vol. 71, no. 10, p. 2142-2151 (2018)
Permanent URL http://hdl.handle.net/2078.1/194300