Abstract
To examine whether the top–bottom axis has an inherent advantage in object perception over the left–right one, three experiments were conducted. In all of them, on each trial one of two alternative stimuli, identical in shape but opposite in direction (viz, related by reflection), was presented. Both reflection about the vertical axis and reflection about the horizontal axis were applied, in different blocks. In Experiment 1, objects with an orientation-free definition (arrows, incomplete squares) were presented. Subjects were to respond when the stimulus pointed in a specific direction, and to refrain from responding when it was reflected, namely pointed in the opposite direction. Axis of reflection (vertical, horizontal) was varied between blocks. In Experiment 2, the object was a Hebrew character asymmetric on both axes, presented either in its normal appearance or reflected. Subjects were to respond only when the stimulus was normal. Both axis of reflection (vertical, horizontal) and orientation angle (upright, tilted by 90°) were varied between blocks. In Experiment 3, stimuli were the same as in Experiment 2, but the task explicitly asked for a binary reflection judgment (normal vs. reflected). No sign for the presence of an axis effect was observed in any of those experiments, which seems incompatible with the hypothesis of vertical advantage in object perception. It is suggested that most vertical advantage observed before is due to extra-perceptual processing.
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Notes
Symmetry about the sagittal axis (namely, front vs. back) is also quite rare. However, since visual information about that axis is very often sparse in most natural settings, it must have quite a modest weight in perception. Anyhow, this study focuses just on the difference between the principal axes of the frontal (coronal) plane, namely the horizontal and the vertical axes.
In an auxiliary experiment with another Hebrew character (Beth), conducted to gain some more generality, no evidence in favor of PVAH was observed either.
And even those are, in many people, not sufficient for realizing how one’s own mirror image is related with her real frontal image (Takano & Tanaka, 2007).
But Hollingworth (2005) reports degrees of accuracy in localizing objects in natural scenes that are about the same in the two frontal axes. See also Carr & Roskos-Ewoldsen (1999) for evidence that naming locations encoded from narratives was more accurate in the horizontal plane than in both vertical planes—sagittal and coronal.
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Acknowledgments
I am indebted to Ziziana Lazar for programming the experiments. I am also indebted to Ori Amir, Jonathan Dvash and Maayan Ben-Eliezer for running the experiments, and to Ronen Kasten for helping in setting them up and conducting the analyses.
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Navon, D. Do top and bottom contribute to object perception more than left and right?. Psychological Research 73, 613–622 (2009). https://doi.org/10.1007/s00426-008-0179-x
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DOI: https://doi.org/10.1007/s00426-008-0179-x