PSYCH306 Chapter Notes - Chapter 1: Receiver Operating Characteristic, False Alarm, Detection Theory
28 Nov 2015
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The stimulus you"re trying to detect (the signal ) is always being detected in the presence of noise . Sit in a quiet room + wear noise cancelling headphones, can still hear something. Internal noise (the static in your nervous system) Close your eyes in a dark room, but you still see something (a mottled pattern of gray with occasional brighter flashes) Sdt (exists to help us understand what"s going on when we make decisions under conditions of uncertainty) Criterion level of response (to decide if it is noise or signal): Criterion (value that is somehow determined by the observer) If response in ns exceeds the criterion, signal (jump out of shower and get the phone) shower) If level if below criterion, noise (decide that it is not a ring and stay in the. Correct rejection (say no signal, there actually is no signal) Hit (say yes signal, when there is a signal)
