Observer pitch and roll influence: The rod and frame illusion |
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Authors: | Jennifer E Corbett James T Enns |
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Institution: | (1) Italian Air Force Medical Corps, IML Roma, Via Piero Gobetti 2, 00185 Rome, Italy;(2) Department of Psychology, “La Sapienza” University of Rome, Rome, Italy;(3) Kayser Italia manufacturer, Livorno, Italy |
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Abstract: | Observers misperceive the orientation of a vertical rod when it is viewed in the context of a tilted frame (therod and frame illusion, or RFI). The pitch and roll of the surrounding surfaces have independent influences on this illusion (Nelson & Prinzmetal,
2003). Experiment 1 measured the RFI when the pitch and roll of the floor that supported the observer was varied, and the
observer was either seated in a chair or standing upright. There were additive influences of pitch and roll on the RFI of
seated but not standing observers. Experiments 2 and 3 decoupled body roll and head roll in order to isolate the vestibular
and proprioceptive contributions to these effects. The results are interpreted in support of a hierarchy of influence on the
RFI: Visual input is given top priority, followed by vestibular input, and then proprioceptive input. |
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