Task-driven visual exploration at the foveal scale
| العنوان: | Task-driven visual exploration at the foveal scale |
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| المؤلفون: | Christie Tang, Natalya Shelchkova, Martina Poletti |
| المصدر: | Proceedings of the National Academy of Sciences of the United States of America |
| بيانات النشر: | National Academy of Sciences, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | priority maps, Adult, Male, Fovea Centralis, Adolescent, Eye Movements, Computer science, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Stimulus (physiology), ocular drift, 050105 experimental psychology, Foveola, 03 medical and health sciences, Young Adult, 0302 clinical medicine, InformationSystems_MODELSANDPRINCIPLES, Face perception, Foveal, Region of interest, Saccades, Humans, 0501 psychology and cognitive sciences, Computer vision, Vision, Ocular, Multidisciplinary, fine spatial vision, business.industry, 05 social sciences, Biological Sciences, Gaze, microsaccades, PNAS Plus, Fixation (visual), Psychological and Cognitive Sciences, face perception, Visual Perception, Female, Artificial intelligence, Microsaccade, business, 030217 neurology & neurosurgery, Photic Stimulation |
| الوصف: | Significance Visual exploration is driven by saccades, which bring the objects of interest into the small high-acuity portion of the visual field, the foveola. While visual exploration is generally studied at large spatial scales, here we show that it also occurs at a much finer scale when examining complex foveal stimuli. By using high-precision methods for localizing the gaze, we show that, in the periods in between saccades, tiny gaze shifts actively inspect the stimulus based on the task demands. These visual scanning strategies closely resemble those adopted for exploring larger scenes, with individual differences maintained across spatial scales. Fine spatial vision, therefore, results from a synergy of visual processes, motor behaviors, and cognitive factors. Humans use saccades to inspect objects of interest with the foveola, the small region of the retina with highest acuity. This process of visual exploration is normally studied over large scenes. However, in everyday tasks, the stimulus within the foveola is complex, and the need for visual exploration may extend to this smaller scale. We have previously shown that fixational eye movements, in particular microsaccades, play an important role in fine spatial vision. Here, we investigate whether task-driven visual exploration occurs during the fixation pauses in between large saccades. Observers judged the expression of faces covering approximately 1°, as if viewed from a distance of many meters. We use a custom system for accurately localizing the line of sight and continually track gaze position at high resolution. Our findings reveal that active spatial exploration, a process driven by the goals of the task, takes place at the foveal scale. The scanning strategies used at this scale resemble those used when examining larger scenes, with idiosyncrasies maintained across spatial scales. These findings suggest that the visual system possesses not only a coarser priority map of the extrafoveal space to guide saccades, but also a finer-grained priority map that is used to guide microsaccades once the region of interest is foveated. |
| اللغة: | English |
| تدمد: | 1091-6490 0027-8424 |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d3a2c7bb891d4885b773a143c2b33ce http://europepmc.org/articles/PMC6431186 |
| حقوق: | OPEN |
| رقم الأكسشن: | edsair.doi.dedup.....3d3a2c7bb891d4885b773a143c2b33ce |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10916490 00278424 |
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