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Abstract
Saccadic choice studies showed that humans initiate the fastest saccades towards faces compared to other visual categories such as animals, objects and scenes. These studies typically present images peripherally, along the horizontal meridian (HM). Our past work showed that face-specialized mechanisms engage most strongly along the HM due to the radial bias facilitating access to the horizontal structure of the face, known to optimally drive face detection and identification. We therefore hypothesized the set-up of past saccadic choice studies may have privileged the access to the horizontal structure of the human face, and therefore (partly) account for the saccadic advantage for faces reported so far. Forty-one participants performed a saccadic choice task, targeting either faces or vehicles presented at 15° eccentricity along both horizontal (HM) and vertical meridians (VM). We expected to corroborate the saccadic advantage for faces along the HM where the radial bias facilitates access to horizontal content, and to see a reduction of this advantage along the VM. We found that the minimum reaction time to initiate a correct saccade (i.e., toward the cued category) was shorter for faces than vehicles overall. This advantage for faces was most prominent along the HM. These findings suggest that the reduced access to horizontal information along the VM could decrease the saccadic advantage for faces. We will investigate this phenomenon further by addressing its potential link to the radial bias and the horizontal tuning of foveal face recognition that we measured in the same participants.
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Grandjean, M., Kauffmann, L., Letesson, C., Kurnaz, E., Roux-Sibilon, A., & Goffaux, V. (2024). Does radial bias influence fast saccades toward faces in the periphery? Louvain Bionics annual symposium, Louvain-la-neuve. https://hdl.handle.net/2078.5/266950