Abstract
A procedure developed earlier (Terrace, 1963) successfully trained a red-green discrimination without the occurrence of any errors in 12 out of 12 cases. Errorless transfer from the red-green discrimination to a discrimination between a vertical and a horizontal line was accomplished by first superimposing the vertical and the horizontal lines on the red and green backgrounds, respectively, and then fading out the red and the green backgrounds. Superimposition of the two sets of stimuli without fading, or an abrupt transfer from the first to the second set of stimuli, resulted in the occurrence of errors during transfer. Superimposition, however, did result in some “incidental learning”. Performance following acquisition of the vertical-horizontal discrimination with errors differed from performance following acquisition without errors. If the vertical-horizontal discrimination was learned with errors, the latency of the response to S+ was permanently shortened and errors occurred during subsequent testing on the red-green discrimination even though the red-green discrimination was originally acquired without errors. If the vertical-horizontal discrimination was learned without errors, the latency of the response to S+ was unaffected and no errors occurred during subsequent testing on the red-green discrimination.
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Selected References
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