Use Five Whys to move from BCI calibration symptom to a process-level corrective action.
A participant's motor imagery calibration collapsed to chance after initially usable performance. Five Whys: symptom -> cause chain -> corrective action The common trap is stopping at 'participant fatigue' or 'bad EEG' before checking instruction, setup, timing, and protocol drift. Why 1 Why did accuracy collapse? The classifier started confusing left imagery with rest. Start with the observed failure, not a judgment about the participant. Why 2 Why did left imagery look like rest? The participant reduced effort after being told to relax more. The cause moves from signal to instruction and user interpretation. Why 3 Why did they interpret…
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