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Visual search and foraging compared in a large-scale search task.
| Content Provider | CiteSeerX |
|---|---|
| Author | Gilchrist, Iain D. |
| Abstract | Abstract It has been argued that visual search is a valid model for human foraging. However, the two tasks differ greatly in terms of the coding of space and the effort required to search. Here we describe a direct comparison between visually guided searches (as studied in visual search tasks) and foraging that is not based upon a visually distinct target, within the same context. The experiment was conducted in a novel apparatus, where search locations were indicated by an array of lights embedded in the floor. In visually guided conditions participants searched for a target defined by the presence of a feature (red target amongst green distractors) or the absence of a feature (green target amongst red and green distractors). Despite the expanded search scale and the different response requirements, these conditions followed the pattern found in conventional visual search paradigms: feature-present search latencies were not linearly related to display size, whereas feature-absent searches were longer as the number of distractors increased. In a non-visually guided foraging condition, participants searched for a target that was only visible once the switch was activated. This resulted in far longer latencies that rose markedly with display size. Compared to eye-movements in previous visual search studies, there were few revisit errors to previously inspected locations in this condition. This demonstrates the important distinction between visually guided and non-visually guided foraging processes, and shows that the visual search paradigm is an equivocal model for general search in any context. We suggest a comprehensive model of human spatial search behaviour needs to include search at a small and large scale as well as visually guided and non-visually guided search. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Visual Search Large-scale Search Task Previous Visual Search Study Inspected Location Red Target Amongst Green Distractors Search Scale Human Spatial Search Behaviour Need Important Distinction General Search Equivocal Model Different Response Requirement Revisit Error Distinct Target Green Distractors Guided Foraging Condition Foraging Process Visual Search Paradigm Direct Comparison Search Location Comprehensive Model Conventional Visual Search Paradigm Condition Participant Feature-present Search Latency Green Target Amongst Large Scale Valid Model Display Size Human Foraging Novel Apparatus Visual Search Task Feature-absent Search |
| Content Type | Text |
