Task-driven visual exploration at the foveal scale.
Level 4 - case-series / case-control
Laboratory psychophysics experiment in healthy human volunteers without comparative clinical arms
PubMed 30824596 · doi:10.1073/pnas.1812222116
What was done
Researchers tracked eye movements at high resolution using a custom gaze-localization system while human observers judged the expressions of faces subtending approximately 1° (simulating distant viewing). The study evaluated whether goal-driven spatial visual exploration occurs at the foveal scale during fixational pauses via microsaccades.
What was found
The abstract reports no numerical values, sample sizes, or statistical metrics. Qualitatively, observers engaged in active, goal-driven visual exploration within the foveola during fixation pauses. The scanning strategies at this fine scale mirrored those used across larger scenes, with individual visual exploration idiosyncrasies preserved.
Why it matters
This indicates that visual exploration is not limited to macro-saccadic scene parsing. It suggests the visual system maintains both a coarse priority map for extrafoveal space and a fine-grained priority map to guide fixational microsaccades.
Limits
The abstract provides no sample size, participant characteristics, or quantitative effect sizes. Findings are limited to a controlled laboratory face-judgment paradigm and may not generalize across all visual tasks.