Imagine a
device using tactile vibrations for GPS-provided turn directions.
Jones has
built an array that precisely tracks a motor’s vibrations through skin in three
dimensions. The array consists of eight miniature accelerometers and a single
pancake motor — a type of vibrating motor used in cellphones.
When
participants were asked to identify specific locations of motors within the
array, they were much more sensitive on the palm than on the forearm or thigh.
But in all three locations, people were better at picking out vibrations in the
four corners of the array, versus the inner motors, leading Jones to posit that
perhaps people use the edges of their limbs to localize vibrations and other
stimuli.
Jones sees
promising applications for wearable tactile displays. In addition to helping
drivers navigate, she says tactile stimuli may direct firefighters through
burning buildings, or emergency workers through disaster sites. In more mundane
scenarios, she says tactile displays may help joggers traverse an unfamiliar
city, taking directions from a buzzing wristband, instead of having to look at a
smartphone.
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