A Startup Plans to Add Feeling to Gesture Control | MIT Technology Review: For the study, participants placed a hand, palm facing up, on a table below an array of 64 ultrasound transducers set in an eight-by-eight grid...
In one experiment, the ultrasound array focused feedback on 25 different parts of the hand to see if participants could pinpoint differences in where, precisely, they felt the waves. In the second, the array emitted waves in a way meant to feel like a line of continuous motion in a specific direction across the hand...
... research indicated that that the smallest virtual shape people could reliably feel was about two centimeters square.
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