In this paper a haptic matching task is used to
analyze haptic spatial processing. In various conditions,
blindfolded participants were asked to make a test bar parallel
to a reference bar. This always resulted in large but
systematic deviations. It will be shown that the results can
be described with a model in which an egocentric reference
frame biases the participants’ settings: What a participant
haptically perceives as parallel is a weighted average
of parallel in allocentric space and parallel in egocentric
space. The basis of the egocentric reference frame is uncertain.
There is strong evidence that at least a hand-centred
reference frame is involved, but possibly a body-centred
reference frame also plays a role
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