This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.View Full Document
Unformatted text preview: Psyc 103 Quiz 3 Questions 27/11/2007 02:39:00 1.) Describe two techniques for measuring generalization gradients. *pg. 225 training phase- first trained pigeon to peck at yellow key by reinforcing pecks with food on a VI schedule and the bird now pecks at the key at a fairly steady rate probe trials: other colors are briefly presented to measure the pigeons responding but no reinforcer is given o probe trials are occasionally inserted among reinforced trials with the training stimulus o example: 90% of the trials might involved the yellow key light and the VI schedule, and the 10% of the trials would include the other key colors and an extinction schedule o advantage-procedure can continue indefinitely without the threat of extinction until sufficient data are collected o disadvantage-subject may begin to form a discrimination between the yellow key and all other key colors, so that there will be progressively less generalization as the training proceeds same training phase, then follow it with a series of extinction trials with both the yellow light and other colors o obtain enough trials with each stimulus before responding extinguishes (often this can be accomplished b keeping the durations of the extinction trials short) 2.) What is peak shift? Does this phenomenon favor the absolute or relational theory of stimulus control? *pg. 229-234 peak shift: after discrimination training with a reinforced stimulus and an unreinforced stimulus, a shift in the peak of a generalization gradient from the reinforced stimulus in a direction away from the unreinforced stimulus favors absolute theory of stimulus control o subject learns only about the two stimuli individually and learns nothing about the relation between the two o Spence proposed that an excitatory generalization gradient develops around the S+ and an inhibitory gradient develops around the S- o The net associative strength (the ability of each stimulus to elicit a response) of any stimulus can be determined by subtracting its inhibitory strength from its excitatory strength o Result is that strength of the stimulus will be higher away from the S+; higher net associative strength of the S+ 3.) Distinguish between positive and negative behavioral contrast, and describe a 3....
View Full Document
This note was uploaded on 04/15/2008 for the course PSYC 103 taught by Professor Pearlberg during the Fall '07 term at UCSD.
- Fall '07