PSY 3108 Lecture Notes - Lecture 1: Statistical Inference, Jargon, Human Factors And Ergonomics
15 Sep 2017
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Document Summary
Methods in perception: qualitative: getting the big picture, whole phenomena in their entirety, quantitative: understanding the details, breaking things down; putting numbers, quantitative values; understanding details, threshold-seeking methods. Quantitative methods in perception: threshold seeking methods measure a physical quantity representing a limit of perceptual ability. I. e a threshold: applied examples include visual acuity tests and hearing tests used in medical and professional qualification settings, eg. Show person a level (i. e eye test) and see when they cross a threshold: the o(cid:271)se(cid:396)(cid:448)e(cid:396) does(cid:374)"t ha(cid:448)e to do a(cid:374)ythi(cid:374)g, method of constant stimuli: very slow but very accurate. Stimulus intensity is adjusted (usually by the observer) continuously until the observer says they can just detect it. Fast, but not always accurate, due to inherently subject nature of adjustment: threshold is point to which observer adjust the intensity, repeated trials (about 10) averaged for threshold. Stimuli of different intensities presented in ascending and descending order.
