Abstract
Haptic matching of the orientation of bars separated by a horizontal distance leads to large systematic
deviations (eg Kappers and Koenderink, 1999 Perception 28 781–795). A bar on the right side has to
be rotated clockwise in order to be perceived as parallel to a bar at the left side. This finding leads
to the following intriguing question which we investigated in this study: Will a bar moving from left
to right in a fixed orientation be perceived as rotating counterclockwise? Blindfolded subjects had
to touch a bar that moved from left to right or from right to left while it was rotating clockwise or
counterclockwise with di erent speeds or did not rotate. For each trial they had to decide whether the
rotation was clockwise or counterclockwise. From psychometric curves fitted to the data, we could
determine that the results were consistent with the findings in the static case: A bar moving from left to
right has to rotate clockwise in order to be perceived as non-rotating (and vice versa). In other words, a
translating bar causes the illusory perception of a rotation.
Original language | English |
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Pages (from-to) | 45-45 |
Number of pages | 1 |
Journal | Perception |
Volume | 40, suppl. |
Publication status | Published - 2011 |