# A Laboratory Introduction to Psychology by John W. P. Ost

By John W. P. Ost

Creation to laboratory experiments within the box of psychology, simple for creation collage classes

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Below each weight in column P record the number S assigns to it on each of the four trials. ANALYSIS Combined data from the entire class can be used to prepare two separate figures, one for each equation. Fechner's equation can be evaluated by plotting P (mean magnitude estimate) as a function of log S (log grams). Stevens' equation can be evaluated by transforming the individual magnitude estimates logarithmically and plotting log P (mean log magnitude estimate) as a function of log S (log grams).

A 50-gram weight seems heavier than a 10-gram weight. The exact form of this psychophysical relationship has been subject to considerable investigation. Fechner proposed that P=klogS (1) where P is the perceived magnitude of the stimulus, S is the physical magnitude, and k is a constant. Equation 1 is the equation for a straight line with slope k. ) and measured the perceived magnitude P of each weight on some psychological scale. Equation 1 predicts that P would be a linear function of log S.

Contrast effects in the judgment of lifted weights. Journal of Experimental Psychology, 1964, 68, 383-387. Data Sheet Experiment 9: Adaptation Level Trial Order Category Scale Value Mean Trial 1 1 2 2 3 3 4 4 5 5 Order Category Scale Value Mean {Continued) 55 Datasheet Trial (Continued) Order Category Scale Value Mean Trial Order Category 6 6 / 7 8 8 9 9 10 10 56 Scale Value Mean EXPERIMENT 10 RELATIVE-SIZE ILLUSION PROBLEM It is well known that the size of an object is judged, in part, by comparison with other objects nearby in the field.

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