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This study was an exploratory investigation into the effects of
some features of control on hand-blind-positioning performance.
Its purpose was to investigated: (1) the interval, needed to
discriminate the orientation, between control and a referent
origin and control''s location effect on such interval; (2) the
effect of push-button width on the accuracy of button-site-
recognition; and (3) the effect of knob diameter on the accuracy
of turned-angle-determination.Therefore, the research was
composed of three experiments. Thirty right-handed subjects
participated three experiments under blind condition by wearing
eyeshade. The performance criteria were, respectively, the
shortest interval needed (or interval threshold) for
orientation-discrimination, and the absolute as well as relative
deviation magnitudes by key number and angle degrees for button-
site-recognition and turned-angle-determination.Results of the
study shown that: (1) the difference of interval thresholds of
two controls location at the same horizontal workplane was not
significant; (2) the interval thresholds at north-east and
south-east directions traveled by hand with elbow joint as pivot
were very significantly shorter than those at north-west and
south-east directions forward by forearm axis; (3) some subjects
misorientated in a systematic way in certain directions; (4) the
interval threshold for orientation-discrimination was on
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