KINESIOL 4V03 Lecture Notes - Lecture 10: Medical Diagnosis, Eyewitness Testimony, Air Traffic Control
28 Dec 2016
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In a signal detection task, the person must indicate whether a signal was present. Bias (b) sensitivity across a sensory continuum: focus on the hit and false alarm rates, hit perceive a stimulus when present, fa perceive a stimulus when it is not present. Best way to consider the concepts of noise and noise+signal is to visualize two overlapping normal distributions. Sensitivity is the distance between the two peaks. If signal is weak, two distributions will overlap. (easier to separate noise from the signal) As you increase the signal, the second distribution will move farther to the right. This graph shows neutral bias just as likely to say (cid:494)yes(cid:495) as to (cid:494)no(cid:495) Sensitivity is a function of the (cid:494)overlap(cid:495) between the signal and noise distribution. Bias will either shift to the left (liberal) or the right (conservative) as a function of the # of hits and fas.
