ACCTG 1 Lecture Notes - Utility, Response Bias, Environmental Noise
Document Summary
People have different response criteria, but may still be equally sensitive to a stimulus. False alarm: stimulus not presented & identified. Correct rejection: stimulus not presented & not identified. Percentage of hits and false alarms depends on personal response criterion. Noise = all other stimuli in the environment. If participant perceives a tone with loudness of 10, it is most likely a false alarm in the (n) condition. If tone is perceived at loudness 20, it could equally be either (n) or (s+n) Tone always has same intensity, but perceived loudness can vary. Lots of overlap between two curves, low sensitivity. Factors other than sensitivity can influence a person"s response. A person"s sensitivity is indicated by the shape of the roc curve. If two persons are on the same curve, they have same sensitivity. R. : 10% hits, 1% false alarms, 99% correct rejection. J. : 50% hits, 6% false alarms, 94% correct rejection.
