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. 2015 Jun 17;6:842. doi: 10.3389/fpsyg.2015.00842

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Copyright © 2015 Stiles, Zheng and Shimojo.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The role of head tilt in length constancy. A horizontal line stimulus (A) or vertical line stimulus (B) dynamically changes in horizontal width (duration of the sound) and vertical height (range of the sound pitch) as the participant tilts their head from vertical (no head tilt, tilt = 0°) to 90° left (negative tilt) or right (positive tilt). Each curve represents a different line length ranging from 9 to 21 cm in length. The sets of curves are viewed from different 3D perspectives in each case for clarity. A dotted half circle is drawn on the height-width plane to show the projection of the 15 cm curve (i.e., the shape of the 15 cm curve without head tilt or the x-axis) in both figures. Additional plot details in Video S1 and Video S2.