Lab 1 - Psychology of Perception Psychology 4165, Spring...

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Psychology of Perception Psychology 4165, Spring 2008 Laboratory 1 Noisy Representations
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Laboratory 1: Noisy Representations This laboratory is meant to explore the Just Noticeable Difference in weight differentiation. This difference is the smallest change in weight from a reference value that will be noticed by touch alone. For our purposes, this difference will be one standard deviation away from the mean. We accomplished this by testing a participant’s ability to distinguish weights from a reference. The hypothesis being tested is that the JND is described by Weber’s Constant, a proportion of the difference to the reference value, and should be equal between the weight sets. We also explored the effect, if any, of the order of the 100 and 200 gram weight sets. There are three methods of measuring this value, and in this case the method of constant stimuli will be used. Methods Participants The participants of this experiment were the twenty nine members of the PSYC 4165 Spring 2008 lab section 2. They are of mixed gender, and generally around the age of twenty. Materials The two weight sets used for this experiment were defined by their standard, either 100 or 200 grams. Each set was composed of the standard and eleven test weights arranged from 25 below to 25 above the reference in intervals of five grams, and including a duplicate of the standard weight. They were made of small weights inside unlabeled film canisters.
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Procedure In the method of constant stimuli, a reference weight is compared with a random succession of other unknown test stimuli. First the participant randomly chose which set of tests to perform first, either with the 100 gram or 200 gram reference weight. This is because as the participant performed the many tests, he may have become either more
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Lab 1 - Psychology of Perception Psychology 4165, Spring...

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