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A developmental study of the category effect in visual search

K E Stanovich, R F West

    Child Development
    |December 1, 1978
    PubMed
    Summary

    Children as young as 8 years old exhibit a category effect in visual search, similar to adults. This indicates that the underlying feature extraction process is fully automated by this age.

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    Area of Science:

    • Cognitive Psychology
    • Developmental Psychology
    • Visual Perception

    Background:

    • Adults show a category effect in visual search, responding faster when target and array items belong to different categories (e.g., letters in number arrays).
    • This effect suggests category information influences visual search efficiency.

    Purpose of the Study:

    • To investigate the developmental trajectory of the category effect in visual search.
    • To determine the age at which the feature extraction process underlying this effect becomes automated.

    Main Methods:

    • Participants aged 8, 10, and adults performed visual search tasks.
    • Target items (letters or numbers) were presented within arrays of same or different category items.
    • Search times were recorded and analyzed for category effects across age groups.

    Main Results:

    • A significant category effect was observed in all age groups (8-year-olds, 10-year-olds, and adults).
    • Search times decreased with age, indicating developmental improvements in visual search speed.
    • The magnitude of the category effect did not increase with age, remaining consistent across development.

    Conclusions:

    • The feature extraction mechanism mediating the category effect in visual search is fully automated by age 8.
    • Developmental changes in visual search primarily relate to processing speed rather than the emergence of the category effect itself.

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