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    Area of Science:

    • Cognitive psychology
    • Human perception
    • Spatial judgment

    Background:

    • Perceptual judgment often involves multiple dimensions.
    • Dimensional interactions in spatial tasks have been attributed to stimulus perception or response decision.

    Purpose of the Study:

    • To investigate the role of distance assessment in dimensional interactions during spatial judgment under speed stress.
    • To determine if horizontal distance can be assessed independently of vertical distance.

    Main Methods:

    • Participants judged horizontal distances between frontal locations under speed stress.
    • Error rates were analyzed for parallel effects of horizontal and vertical distances.
    • A control condition assessed judgments of same horizontal position.

    Main Results:

    • Error rates showed parallel effects of horizontal and vertical distances, indicating interdependence.
    • Horizontal distance assessment was not independent of vertical distance.
    • Parallel effects were absent when judging identical horizontal positions, supporting the proposed account.

    Conclusions:

    • Dimensional interaction in this task stems from the distance assessment process, not stimulus perception or response decision.
    • Participants assessed overall distance, weighting vertical positions to minimize it before assessing horizontal distance.
    • This model explains how independent positional information can lead to interdependent distance judgments.