Mitigations buy comfort by spending immersion
Aliases: presence cost of mitigation · comfort versus presence · mitigation side effects
What it is
Blacken the edges, add a cabin that always faces you, slice turning into steps: discomfort falls, and so does the sense of being in the world. The comfort-immersion tradeoff is that almost every mitigation works by breaking some sensory coherence or some completeness of the view. The comfort it buys is not free.
The choice is not “mitigation on or off.” It is who pays the immersion, how much, and whether the user can set the amount.
Why it happens
Presence depends on senses that do not fight: a wide enough view, a world that continues physically, no layer that obviously does not belong. Mitigations dismantle those one at a time — FOV restriction dismantles peripheral awareness, a rest frame dismantles “I am standing in this world rather than sitting in a cabin,” discrete angle steps dismantle continuity of turning. Sickness drops because a conflict channel is blocked or bypassed; presence drops because the patch that blocks the conflict is itself visible.
The trade is not linear. A light tunnel may barely bruise presence while already cutting some peripheral flow; push it deep and presence collapses first while extra comfort flattens. Stack several mitigations and comfort need not add, while visible patches do: black edge plus cabin plus shake-off and the world starts to read as an instrument panel.
Studying it
Any mitigation study has to take discomfort and presence together; an SSQ drop alone is not the result. A common pairing is FMS/SSQ against IPQ or the SUS presence questionnaire, plus “would you leave this option on for yourself.” Sweep mitigation intensity (tunnel amplitude, rest-frame area, snap size) and plot two curves: comfort gained, presence lost. The crossing is individual, so also watch disable rate — a high rate means the default already passed that person’s acceptable point.
Short sessions underestimate presence loss: for five minutes the tunnel is an effect; at thirty it is a resident defect.
Where it stops holding
In training or tool applications whose only goals are arrival, efficiency, and not vomiting, immersion can be sold off wholesale and the trade leans comfort. In experiences whose product claim is “being there,” default intensity must sit weak, with strong mitigation behind an option. For people almost immune to cybersickness, any visible patch is a net loss. When real walking already matches, mitigation is charging a fee where there is no conflict. If a mitigation is made fully invisible (for example lowering peripheral contrast in the renderer, with users unable to report “I saw something”), the trade still exists; presence questionnaires may just be too coarse to see it.
Applying it
- Make every mitigation disableable and tunable. Start the default at a weak setting. Do not ship the strongest combination as an un-disableable global preset.
- Do not stack by default. Tunnel, rest frame, and snap turning each cover a slice of motion; opening all three at once needs an explicit “comfort mode” entry, not a silent all-on.
- In passages sold on presence (openings, key narrative), turn visible mitigations off; turn them on in locomotion-heavy passages.
- How to check: sweep intensity from zero to high while logging FMS and a 0–10 “still in this world?” Comfort already flat while presence still falling is the point the default must not cross. If more than a small slice of core users disable it, the default is too strong.