An indicator works only where users naturally look

What it is

Indicator visual detectability is the probability that a status signal enters central or effective peripheral vision under real posture, distance, lighting, and task. A lit lamp is not necessarily seen. Placement behind a display, on a keyboard edge, outside a headset view, or under a hand cannot support timely awareness. Location should follow natural gaze during the relevant activity rather than convenient internal layout.

Why it happens

Visual attention concentrates on task targets, while small, static, low-contrast peripheral signals have weak detection. Device angle, external monitors, closed-lid docking, and room-scale placement invalidate the straight-on viewpoint used during design. Locating indication near the sensor or primary display boundary benefits from gaze toward that region, but size, luminance, contrast, and duration jointly determine detection.

Studying it

Detection should be an unexpected secondary event rather than a task that instructs participants to watch the lamp. Video calls, media tasks, external displays, bright and dark environments, distances, and ordinary grips can yield first notice, latency, miss, and primary-task disruption; eye tracking can verify whether the cue entered view. High detection with a front-facing lab setup does not generalize to room-scale or secondary-display use.

Where it stops holding

No visual location reaches everyone. Color-vision variation, low vision, attentional impairment, and inability to see the device call for shape, text, sound, haptics, or companion status. More brightness and motion improve capture but can create glare and fatigue during legitimate continuous use. Ambient sensors without a natural gaze surface need physical control and multimodal state.

Applying it

• Map gaze distributions for video, voice, headset, external-display, and room-device postures before choosing location.
• Place the cue near the primary display boundary or sensor and verify recognition across occlusion, angle, and lighting.
• Use a brief transition for a new event, then stable low-interference state, with non-color encoding.
• Measure unprimed detection and latency during primary tasks including assistive and external-display conditions; require behavioral recognition rather than optical output alone.

Related

• Same group: O2.03.1 Collection needs an indicator the application cannot suppress · O2.03.2 The indicator must appear when collection starts · O2.03.3 Indication is especially important for background collection · O2.03.4 Hardware lights resist spoofing and suppression better than software icons · O2.03.6 One light for multiple sensors obscures what is collecting · O2.03.7 Users must learn what the indicator means
• Adjacent: A5.07 Attentional capture · O3.05 Security-warning fatigue and disregard
• Search terms: indicator detectability · peripheral vision · gaze distribution