How radial biases influence fast saccades towards faces in the periphery

Grandjean, Marius;Kauffmann, Louise;Kurnaz, Ece;Roux-Sibilon, Alexia;Goffaux, Valérie
(2023) Neurocog 2023 — Location: Bruxelles (23.November.2023)

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Abstract
Saccadic choice studies have demonstrated that faces are more rapidly and accurately foveated in the periphery than other stimuli, such as animals, objects and scenes. These studies typically present images along the horizontal meridian, which facilitates access to horizontal cues due to radial biases in the periphery. We recently showed that the visual mechanisms specialized for the processing of faces in the periphery engage more strongly along the horizontal meridian likely due to a facilitated access to the horizontal face cues, which convey the most diagnostic cues for face identity recognition. The present study addresses the extent to which radial biases also modulate the saccadic advantage for faces in the periphery. In a saccadic choice task, we will present faces and vehicles in the periphery either horizontally or vertically and compare the latency (in milliseconds from the onset of stimuli) and accuracy (% error) of saccades in both conditions using a Bayesian linear mixed-effects model. We anticipate that the reduced access to horizontal information in the vertical meridian will decrease the saccadic advantage for faces. The findings of this study will shed light on the mechanisms underlying face perception in the periphery and could challenge the widely shared assumption of a general saccadic advantage for the processing of faces.
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Grandjean, M., Kauffmann, L., Kurnaz, E., Roux-Sibilon, A., & Goffaux, V. (2023). How radial biases influence fast saccades towards faces in the periphery. Neurocog 2023, Bruxelles. https://hdl.handle.net/2078.5/266690