Learning-related shifts in generalization gradients for complex sounds |
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| Authors: | Matthew G Wisniewski Barbara A Church and Eduardo Mercado |
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| Institution: | (1) Department of Psychology, Park Hall, University at Buffalo, State University of New York, 14260 Buffalo, NY; |
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| Abstract: | Learning to discriminate stimuli can alter how one distinguishes related stimuli. For instance, training an individual to
differentiate between two stimuli along a single dimension can alter how that individual generalizes learned responses. In
this study, we examined the persistence of shifts in generalization gradients after training with sounds. University students
were trained to differentiate two sounds that varied along a complex acoustic dimension. The students were subsequently tested
on their ability to recognize a sound that they had experienced during training when it was presented among several novel
sounds varying along this same dimension. Peak shift was observed in Experiment 1, in which generalization tests immediately
followed training, and in Experiment 2, in which the tests were delayed by 24 h. These findings further support the universality
of generalization processes across species, modalities, and levels of stimulus complexity. They also raise new questions about
the mechanisms underlying learning-related shifts in generalization gradients. The sound stimuli from this study are available
as .wav files from http://lb.psychonomic-journals.org/content/supplemental. |
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