Comparing eye scan path with a single stroke that passes over all items in serial visual search task.

SOGO, Hiroyuki · 2011 · Crossref

DOI: 10.4992/pacjpa.75.0_1am115

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Summary

This study investigates the relationship between eye movement patterns during serial visual search tasks and the theoretical shortest path connecting all search items. The research addresses a gap in understanding how closely human visual scan paths adhere to optimal geometric paths, specifically comparing actual eye movements against a single continuous stroke that passes over all items in the most efficient order. The study employed two distinct experimental conditions with different participant groups. In the eye movement experiment, 25 participants performed a visual search task on a CRT monitor. The display featured a 16-item array arranged in an 8x8 grid, with one target item and 15 distractors. Participants searched for the target, and their eye movements were recorded using an Eyelink eye tracker. In the manual stroke experiment, 33 participants (including those from the eye movement group) drew a single continuous line on paper connecting all 16 items in the order they perceived them, starting from a designated point. This manual path served as a proxy for the cognitive sequence of attention. The researchers used the ScanMatch algorithm to quantify the similarity between the eye movement scan paths and the manual stroke paths. The results indicated a significant correlation between the two measures. The manual stroke paths were found to be approximately 108% of the length of the theoretical shortest path, suggesting that participants’ manual connections were near-optimal. More importantly, the ScanMatch analysis revealed a significant positive correlation (r = 0.68, p < 0.01) between the eye movement scan paths and the manual stroke paths. This finding demonstrates that the sequence of eye fixations during visual search closely mirrors the sequence of items connected by a single, efficient stroke. The study further noted that participants who drew shorter manual strokes tended to have eye movement patterns that more closely resembled the shortest path, implying that efficient visual search strategies are reflected in both overt eye movements and covert attentional sequences. The significance of this work lies in its validation of using manual stroke paths as a reliable indicator of visual search efficiency. By establishing that eye scan paths and manual connection paths are significantly correlated, the study suggests that manual tracing tasks can serve as a practical alternative to eye-tracking for assessing visual search strategies. This has implications for fields where eye-tracking equipment is unavailable or impractical, allowing researchers to infer visual attention patterns through simpler behavioral measures. The findings support the hypothesis that human visual search is guided by an internal representation of the shortest path, optimizing the sequence of attention across spatially distributed items.

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Topics

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• eye movements scanning
• visual search