PSYC 367 Lecture Notes - Winter 2018 Lecture 4 - Receiver operating characteristic, Fundamental frequency, Detection theory
Document Summary
State the difference between sensitivity (d") and criterion, and describe the effect of stimulus probability on each. Describe signal detection theory in terms of the hypothetical distributions underlying performance. Show how d", criterion, hits, false alarms, misses and correct rejections are represented on noise and signal + noise distributions. Indicate frequency, amplitude and phase on a diagram of a simple sine wave, and define sound pressure level. List the units of measurement corresponding to each feature and the normal human range. Define fourier"s theorem and fourier analysis, and describe the use of sine waves to describe auditory stimuli. Explain why 2 different musical instruments sound different even when playing the same note. Endogenous noise: spontaneous neural activity; affects measurement of thresholds & sensitivity. Criterion: response bias within an observer; depends on expectations & motivation. Can manipulate criterion due to expectations by varying stimulus probability. If they expect a stimulus present, they should say yes.