| Summary: | The goal for this research is to study a new class of force feedback applications based on
abstract messages we call haptic icons. With the introduction of active haptic displays, a
single knob or joystick can be used to control several different, sometimes non-related,
functions. The functions associated with these multi-function handles can no longer be
identified from one another by position, shape or texture differences. Haptic icons are
brief programmed forces applied to a user through a haptic interface conveying an
object's or event's state, function or content in a manner similar to visual or auditory
icons.
This thesis begins with a presentation of several tools that were developed to aid this
research. It then describes a series of psychophysical tests designed to obtain the basic
perceptual limits for our haptic interface. Knowing these perceptual limits is a
prerequisite for proper haptic icon design. We analyzed a set of synthetically constructed
haptic icons using Multidimensional Scaling, in order to discover the underlying
perceptual processes in identifying different haptic stimuli.
Results show that a set of icons constructed by varying the frequency, magnitude and
shape of 2-sec, time-invariant waveforms map to two perceptual axes, which differ
depending on the signals' frequency range, and suggest that expressive capability is
maximized in one frequency subspace.
I finish by proposing future work to be done on this area.
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