High gain shortens long travel; low gain improves fine positioning
Aliases: speed-accuracy tradeoff · mouse sensitivity · pointer gain
What it is
Gain creates a speed-precision tradeoff: high gain lets a short hand movement traverse a long screen distance, while low gain compresses the same small hand error into less cursor error. Neither is intrinsically better; task distance and tolerance determine the tradeoff.
Why it happens
The transport phase of a long acquisition is limited by hand travel, which high gain reduces. The correction phase near a small target is limited by endpoint noise, where low gain makes a correction less likely to cross the boundary. Gain changes display response, not human motor variation, so increasing it magnifies that variation on screen.
Studying it
Compare several gains separately for long-distance large targets, short-distance small targets, and two-phase tasks. Measure time, overshoot, submovements, and errors. Mean total time alone is inadequate: one setting may transport faster but need more pull-back corrections at the endpoint.
Where it stops holding
High gain does not always reduce time; under high latency, tremor, or dense targets, overshoot can erase travel savings. Low gain does not invariably improve precision when repeated clutching or fatigue raises final error. Where touch contact area is the main error source, mouse-style gain adjustments are irrelevant.
Applying it
- Give workspace-spanning transport and pixel-level stopping distinct, predictable control modes.
- Offer temporary slow movement, zoom, or snapping for fine edits instead of forcing a permanently low global sensitivity.
- Validate broad travel and tiny targets separately, inspecting overshoot, clutching, and completion time.
Related
- Same group: C1.03.1 Gain is the ratio of cursor displacement to device displacement · C1.03.3 Gain couples with display size and pixel density, so it cannot transfer directly across devices · C1.03.4 One fixed gain cannot satisfy both coarse and fine positioning
- Nearby: C1.04 Mouse acceleration curves · C1.05 Cursor hotspots and hit testing
- Search terms:
speed-accuracy tradeoff·pointer gain·fine positioning