critical. sensitivity period

period, critical.sensitivity 

1. The capability of responding to or transmitting a stimulus.
2. The reciprocal of the threshold.
3. The extent to which a test gives results that are free from false negatives (i.e. people found not to have the defect when they actually have it). The fewer the number of false negatives, the greater is the sensitivity of the test. It is usually presented as a percentage of the number of people truly identified as defectives, referred to as true positives, A (or hit), divided by the total number of defective people tested. The total number includes all the true positives, A, plus the false negatives, C (or miss). Hence
See specificity.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
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