day03-psychophysics - Psychology 2050 Perception 1 Sept 11...

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Psychology 2050 Perception 1 Sept 11 Day 03 http://blackboard.cornell.edu http//susan.psych.cornell.edu Two Psychophysical Phenomena Measurement: 4 scales Anisomorphism: Hayek and 4 cases 1. Broca-Sulzer effect 2. Detection thresholds teleology absolute vs. relative Just noticeable differences - JND s 3 methods: limits, adjustment, constant stimuli States of the nervous system spontaneous neural activity Gustaf Fechner 1801-1887 Elements of Psychophysics 1860 beginnings of empirical psychophysics a way to measure (in dealing with) the mind-body problem How do we measure? in all of science and humanites, 4 ways S.S. Stevens, 1951 nominal : classi±es gender “this is different than that” “this is the same as that” nested nominality = hierarchies, elaboration of Linnaeus taxomony “belongs to” relations Eukarya Animalia Chordata Mammalia Primates Hominidae Homo H. sapiens
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meronomy “part of” relations Fingers nominal: classifes gender nested nominality = hierarchies, taxonomies ordinal : classifes & class @ CU orders “this is more than that” nominal: classifes gender nested nominality = hierarchies, taxonomies ordinal: classifes & class @ CU orders interval : classifes, °C, °F shows “measured” di±±erences “This di±±erence is equal to that di±±erence” “This di±±erence is twice that di±±erence” nominal: classifes gender nested nominality = hierarchies, taxonomies ordinal: classifes & class @ CU orders interval: classifes, °C, °F shows measured di±±erences ratio : classifes, orders, K, m, s, kg has a true zero. “This value is twice as much as that value” psychophysics psycho-physics ordinate --> psycho- usually ordinal scale abscissa --> -physics usually ratio scale Region of plotted function ordinate abscissa anisomorphism an - not iso - same morph - structure ism - practice, theory φ : ψ
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F.A. Hayek (1899-1992) The sensory order (1952), pp. 7-8 " . .. psychology must take the
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day03-psychophysics - Psychology 2050 Perception 1 Sept 11...

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