Information Access Effort: Are Head Movements “Cheap” or Even “Free”?
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Summary
This study investigates Information Access Effort (IAE) in the context of augmented reality head-mounted displays (AR-HMDs), specifically examining whether head movements impose a performance cost when accessing information at varying visual eccentricities. While previous research established that accessing information requiring eye scans or head movements incurs nonlinear effort costs, it remained unclear how these costs manifest in AR-HMDs, which can overlay virtual content across a wide field of view. The authors sought to determine if the established IAE function, which predicts decreased accuracy and increased response time with greater visual separation, applies to AR-HMDs, and whether head movements serve as a compensatory mechanism that mitigates these costs. The experiment utilized a Microsoft HoloLens 2 AR-HMD with twenty-six participants. Participants performed two types of tasks: a focused attention task (judging if a single number was greater or less than a threshold) and a computation integration task (calculating the difference between two numbers). Information was presented at four lateral distances from a fixation point: 2°, 16°, 32°, and 50°. The 50° condition required mandatory head movement as the stimulus was outside the initial field of view, while closer distances allowed optional eye or head movements. Performance was measured via response time and accuracy. Contrary to the predictions of the traditional IAE function, the results showed no significant decline in performance as display separation increased. For both the focused attention and integration tasks, neither response time nor percent error was significantly affected by visual angle. Notably, in the integration task, there was a non-significant trend toward improved accuracy at greater eccentricities beyond 16°. While the integration task was inherently more difficult, resulting in slower response times and higher error rates overall compared to the focused attention task, the interaction between task type and display separation was not significant. The authors attribute the lack of performance degradation to the participants' use of head movements. Evoking head movements allowed users to restore and preserve accuracy at greater visual distances without hindering response time, effectively neutralizing the expected effort-induced costs associated with peripheral vision or extensive eye scanning. The findings challenge the assumption that head movements are inherently costly in AR-HMD contexts. Instead, head movements appear to be a "cheap" or even "free" strategy for accessing information, as they enable users to maintain high accuracy and consistent response times regardless of where information is placed within the visual field. This suggests that designers of AR-HMDs may have greater flexibility in placing virtual content at wider visual angles than previously thought, provided that users are free to move their heads. The study highlights the importance of considering user behavior, such as voluntary head movement, when evaluating the scan-clutter tradeoff in augmented reality interfaces.
Key finding
Evoking head movements preserved accuracy at greater visual eccentricities without hindering response time, contrary to predictions of performance loss.
Methodology
lab_experiment
Sample size: 26
Provenance
The full processing record for this entry. Every stage of this paper's journey through the pipeline is logged — what ran, with which tool and model, how many attempts it took, and when it last completed. Discovered via author_sweep_intake on 2026-05-27.
| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | author_sweep | — | — | 2 | 2026-05-27 |
| archive | success | canonical_url | — | — | 6 | 2026-06-06 |
| extract | success | cached | — | — | 3 | 2026-06-10 |
| clean | success | clean | — | — | 1 | 2026-06-04 |
| chunk | success | chunk | — | — | 1 | 2026-06-04 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-04 |
| enrich | success | — | — | — | 1 | 2026-05-07 |
| promote | success | — | — | — | 1 | 2026-05-07 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 2 | 2026-06-10 |
| tag | success | vector_similarity | — | — | 15 | 2026-06-11 |
| verify | success | — | — | — | 2 | 2026-06-10 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.
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