Visual attention and objects: New tests of two-object cost

Johan Hulleman, Frans Boselie

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    Baylis and Driver (1993) proposed that the positions of object parts are coded relative to the position of the object they belong to and that parts of different objects are not directly coded relative to each other. This theory predicts that it is easier to judge a difference in height of parts belonging to a single object (one-object condition) than of parts belonging to two objects (two-object condition). This two-object cost has been reported in several articles (Baylis, 1994; Baylis & Driver, 1993, 1995). However, in all these experiments, the method that was used favored the one-object condition. In the present experiments we obtained, for the first time, evidence for the existence of two-object cost without such a bias. We are grateful to Mary Peterson and Bradley Gibson for pointing out the weak spots in the display of Experiment 1. The Netherlands Organization for Scientific Research (NWO) is gratefully acknowledged for funding this project. This research was conducted while J.H. was being supported by a grant from the NWO Foundation for Behavioral Sciences (575-62-062).
    Original languageEnglish
    Pages (from-to)367-373
    Number of pages6
    JournalPsychonomic Bulletin and Review
    Issue number3
    Publication statusPublished - Sept 1997


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