Assessing the Size of the Functional Field of View in a Gaze-Contingent Search Paradigm

• Published in: Proceedings of the ACM on human-computer interaction 2024-05, Vol.8 (ETRA), p.1-17, Article 223
• Main Authors: Krasovskaya, Sofia, Kristjánsson, Árni, Macinnes, Joseph
• Format: Article
• Language: English
• Subjects: Empirical studies in HCI; HCI design and evaluation methods; Human computer interaction (HCI); Human-centered computing; Laboratory experiments
• ISSN: 2573-0142; 2573-0142
• DOI: 10.1145/3655597

The functional field of view (FFV) is the part of the visual field centred around the current gaze position that the visual system can process in detail. Its size depends partly on physiological limitations, but its adaptability is largely determined by cognitive factors. For example, changes in the FFV often reflect the demands of a given task: it shrinks with high task demands and expands with easier tasks. Here, we placed an upright or inverted target among distractors. We manipulated the visibility of the search array during gaze-contingent search with small (6°), medium (12°) and large (18°) apertures. Aperture size affected performance, improving it when it increased from 6° to 12°, but not from 12° to 18°, suggesting an upper bound of the 'natural' aperture for this specific task. Furthermore, our results suggest that the FFV does not change in size in response to stimulus inversion.