Abstract
The purpose of the present investigation was to determine whether the orientation between an object’s parts is coded categorically for object recognition and physical discrimination. In three experiments, line drawings of novel objects in which the relative orientation of object parts varied by steps of 30° were used. Participants performed either an object recognition task, in which they had to determine whether two objects were composed of the same set of parts, or a physical discrimination task, in which they had to determine whether two objects were physically identical. For object recognition, participants found it more difficult to compare the 0° and 30° versions and the 90° and 60° versions of an object than to compare the 30° and 60° versions, but only at an extended interstimulus interval (ISI). Categorical coding was also found in the physical discrimination task. These results suggest that relative orientation is coded categorically for both object recognition and physical discrimination, although metric information appears to be coded as well, especially at brief ISIs.
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Rosielle, L.J., Cooper, E.E. Categorical perception of relative orientation in visual object recognition. Memory & Cognition 29, 68–82 (2001). https://doi.org/10.3758/BF03195742
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DOI: https://doi.org/10.3758/BF03195742