A customer complains that the system occasionally triggers alerts for deviations smaller than the estimated just-noticeable difference. Which of the following best explains this behaviour, and how might the system be adjusted to better meet the customer’s expectations?

Question

Accepted Answer

The JND reflects a 50% detection probability, not a hard cutoff. Alerts below the JND can occur. Adjusting the decision threshold to a higher probability (e.g., 75%) would reduce such false positives

Answer

The JND varies between sessions due to sensor drift, so it must be recalculated frequently to maintain consistent alert behaviour

Answer

Variability in sensor readings due to system noise can cause alerts near the JND. This could be mitigated by signal averaging or adjusting the detection threshold

Answer

The JND is a hard threshold, so alerts for smaller deviations suggest a problem with sensor calibration

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A customer complains that the system occasionally triggers alerts for deviations...

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