The results of several kinds of measurements, previously done, were
described. They deal with haptic perception on a horizontal plane in front
of the subject. Three blindfolded subjects had to set directions as a
function of place in this plane. They had to set a rod parallel to another
rod somewhere else in the plane, had to point to a certain point in the
plane or had to set two rods in-line. It was evident that the subjects made
certain errors systematically, and it was assumed that these errors could be
described with a real function of the plane coordinates. The error made is
then the difference of this function on the two involved positions (The one
on which the direction should be set, and the one which gives the direction
to be set). This function was described in terms of a model of the arm, and
could be characterized by a certain factor, which could be found by
comparing the measurements to this model. Logically, one wouldn't expect the
function to be the same for all three types of described measurements,
because sometimes a direction had to be set and perceived, and sometimes
only to be set. It was shown that they indeed didn't. The factors also are
different for different subjects.
Further, the from literature already known `oblique effect' was searched for
in the measurements. There are two, one in the standard-deviation (preciseness)
for which no evidence was found, and one in the absolute error (systematic),
which was found. It was shown that this last effect can for an important
part be attributed to an `in-line' effect.
Haptic perception, psychophysics, oblique effect
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