Accession Number : ADA261658


Title :   Spontaneous Discovery and Use of Categorical Structure


Descriptive Note : Annual technical rept. 15 Jan 1992-14 Jan 1993


Corporate Author : STANFORD UNIV CA DEPT OF PSYCHOLOGY


Personal Author(s) : Clapper, John P ; Bower, Gordon H


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a261658.pdf


Report Date : 15 Feb 1993


Pagination or Media Count : 31


Abstract : These experiments investigated unsupervised category learning using tasks in which subjects attempted to memorize the features of training instances from two contrasting categories. On each trial, subjects studied a verbal feature list (training instance) for 24 seconds, after which they were given multiple choice recognition tests to evaluate their memory for each list item. The amount of time spent looking at each feature during the study phase, and the accuracy of recognition during the test phase, provided two separate indices of unsupervised learning on each trial. The main independent variable in these experiments was the specific sequence in which instances from the two categories were presented. The effects of these sequence manipulations on learning provided strong evidence for the use of an explicit, non-incremental, category invention process to capture the consistent structure of the stimulus domain. The present experiments also showed the selective encoding process and enhanced memory for instances predicted by standard, schema-based, theories of learning.... Unsupervised learning, Category invention, Attribute, Feature, Default.


Descriptors :   *MEMORY(PSYCHOLOGY) , *SEQUENCES , *CODING , *LEARNING , TEST AND EVALUATION , RECOGNITION , PSYCHOLOGICAL TESTS , PATTERN RECOGNITION , VARIABLES , AUTOCORRELATION , TRAINING


Subject Categories : Psychology


Distribution Statement : APPROVED FOR PUBLIC RELEASE