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    Please use this identifier to cite or link to this item: https://nccur.lib.nccu.edu.tw/handle/140.119/75523


    Title: Category variability effect in category learning with auditory stimuli
    Authors: Wu, Yueh Hsun
    吳岳勳
    Yang, Lee-Xieng
    楊立行
    Contributors: 心理系
    Keywords: category variability effect;sequence effect;perceptual category learning;memory and comparison;decision bound model
    Date: 2014-09
    Issue Date: 2015-06-02 17:04:19 (UTC+8)
    Abstract: The category variability effect refers to that people tend to classify the midpoint item between two categories as the category more variable. This effect is regarded as evidence against the exemplar model, such as GCM (Generalized Context Model) and favoring the rule model, such as GRT (i.e., the decision bound model). Although this effect has been found in conceptual category learning, it is not often observed in perceptual category learning. To figure out why the category variability effect is seldom reported in the past studies, we propose two hypotheses. First, due to sequence effect, the midpoint item would be classified as different categories, when following different items. When we combine these inconsistent responses for the midpoint item, no category variability effect occurs. Second, instead of the combination of sequence effect in different categorization conditions, the combination of different categorization strategies conceals the category variability effect. One experiment is conducted with single tones of different frequencies as stimuli. The collected data reveal sequence effect. However, the modeling results with the MAC model and the decision bound model support that the existence of individual differences is the reason for why no category variability effect occurs. Three groups are identified by their categorization strategy. Group 1 is rule user, placing the category boundary close to the low-variability category, hence inducing category variability effect. Group 2 takes the MAC strategy and classifies the midpoint item as different categories, depending on its preceding item. Group 3 classifies the midpoint item as the low-variability category, which is consistent with the prediction of the decision bound model as well as GCM. Nonetheless, our conclusion is that category variability effect can be found in perceptual category learning, but might be concealed by the averaged data.
    Relation: Frontiers in Psychology, 5(Sep), 論文編號 Article 1122
    Data Type: article
    DOI link: http://dx.doi.org/10.3389/fpsyg.2014.01122
    DOI: 10.3389/fpsyg.2014.01122
    Appears in Collections:[Department of Psychology] Periodical Articles

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