A marine research institute is conducting an experimental study on the cognitive fatigue experienced by commercial saturation divers living in a pressurized hyperbaric chamber during a 28-day deep-sea mission.
At the end of each daily shift, divers are required to complete a brief digital survey on a tablet inside the habitat. One of the questions asks participants to rate their "mental alertness during the final decompression phase of the day" on a scale from 1 to 7, where 1 represents "completely exhausted" and 7 represents "fully alert." Aside from this daily survey, the divers follow their standard operational and resting schedule.
Explain one limitation of assessing mental alertness using a rating scale of 1–7 in this study.
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