Examination of individual differences in eye movement dynamics during mouse-and gaze-foraging
Résumé
During finger-foraging tasks, observers change their strategy according to the crypticity of the targets. During feature-based foraging involving two target types (e.g., red and green dots) among two distractor types (e.g., yellow and blue dots), observers select the two target types randomly. However, in more cryptic conjunction-based tasks (e.g., green dot and red square targets among red dot and green square distractors), observers mainly select targets in two long runs, by exhausting one entire target category before turning to the second one. Some observers were however considered “super-foragers” because they switched randomly between target types even during conjunction-foraging. In the current study, we recorded eye movements of observers during mouse-selection and gaze-selection based foraging, expecting that oculomotor dynamics should vary according to the foraging strategy that is used. Our preliminary results indicate that the ability of “super-foragers” to switch between the two target types in conjunction-search comes both with costs and benefits. We report individual differences in foraging strategies and eye movement dynamics that provide important insights into how observers orient in the visual world and about the optimal strategies for efficient foraging.
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