Further notes on Concept Formation
Erwin Segal
Hull's study (1920) was based on increasing the strength of associations in order to learn concepts. It can easily be explained with a connectionist type model.
Examples of Hull's concept exemplars
Hull concepts
 
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Continuity and discontinuity
Kendler's Reversal learning study gave similar tasks to rats, approximately 3year old children, 5 year olds and adults. This study found different patterns of responses among different subject groups. Kendler reversal shift
 
This study puts a strain on simple strengthening of association elements. It seems to support some kind of selective attention to certain dimensions of the stimulus at times, especially for subjects that have linguistic skills. Researchers have shown similar processes of selection in nonlinguistic animals, but it requires more learning or special conditions.
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Stimuli used by Bruner, Goodnow and Austin (1956) for the study of learning concepts based on orthogonal Aristotelean features of concepts. This study presented data that purportedly showed that people attempt to solve category learning problems by using strategies. bruner-goodnow-austin

 
This study was the frst of many that developed hypothesis testing as a major component of many categorization tasks.  It was much more complicated in design and analysis than many other studies which highlighted specific processes more clearly. 
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