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Copyright 1999 Psychonomic Society, Inc. 1178 Perception & Psychophysics
 

Summary: Copyright 1999 Psychonomic Society, Inc. 1178
Perception & Psychophysics
1999, 61 (6), 1178-1199
There are three methodologically distinct types of cat-
egorization experiments (see, e.g., Ashby & Maddox,
1998). In a supervised categorization task, the observer
is told the number of contrasting categories, and feedback
is provided after every trial. An unsupervised categoriza-
tion task is the same as a supervised task, except that no
feedback is provided. In other words, the observer is told
the number of contrasting categories, but feedback is
never provided. Finally, in a free sorting task, observers
are not provided feedback, and they are not told the num-
ber of contrasting categories. The typical free sorting in-
structions are to sort the stimuli into as many categories
as one desires. In addition, unsupervised and free sorting
tasks usually present the stimuli differently. In a typical
free sorting task, all the stimuli can be viewed simultane-
ously, whereas in unsupervised tasks, the stimuli are often
viewed sequentially (as they are in supervised tasks).

  

Source: Ashby, F. Gregory - Department of Psychology, University of California at Santa Barbara

 

Collections: Biology and Medicine; Computer Technologies and Information Sciences