Abstract
Systematic deviations occur when blindfolded
subjects set a test bar parallel to a reference bar in the
horizontal plane using haptic information (Kappers and
Koenderink 1999, Perception 28:781–795; Kappers 1999,
Perception 28:1001–1012). These deviations are assumed
to reflect the use of a combination of a biasing egocentric
reference frame and an allocentric, more cognitive one
(Kappers 2002,
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