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Kotani, K., Yamamoto, K., Horii, K.
Characteristics of Differential Threshold for Tactile Sensation Induced
by Air-Jet
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Keywords: Weber ratio, differential threshold, air-jet, rise time,
tactile sensation
This study investigated the relationship between the force applied to a finger
by air-jet and the differential threshold of the force. The rise time of the
force was also evaluated as a factor of changes in differential threshold.
A total of 14 subjects performed a psychophysical experiment, conducted to
obtain the differential threshold from 2gf to 7gf. For the effect of the rise
time, 10 subjects participated in the next experiment where three levels of
standard stimuli (4gf, 7gf, and 10gf) as well as three levels of rise time
ranging from 0.3 to 2.0 seconds from the stimulus onset to the peak force
were tested. As a result, the Weber ratio stayed 0.1 when the standard
stimulus was as small as 4gf, whereas the Weber ratio gradually increased
when the standard stimulus was smaller than 4gf. The results revealed that
the Weberfs law cannot apply to the small magnitude of stimuli as in the
case of stimuli given as other perceptions such as visual and auditory
perception.
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