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Dongsheng Yang, Richard W Hertle, Nancy Hanna, Tonia Polansky; Brainport artificial vision study: tongue’s tactile motion detection in children. Invest. Ophthalmol. Vis. Sci. 2014;55(13):4119. doi: https://doi.org/.
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© ARVO (1962-2015); The Authors (2016-present)
To investigate tactile motion detection of the tongue in children.
The Brainport vision device consists of a miniature video camera mounted to a pair of glasses. The video is converted to an electrotactile stimulus on an electrode array placed on the surface of the tongue. The tongue array is housed in an epoxy resin and includes 400 (20x20) steel electrodes in a 3x3 cm square. The stimulus image is a 3° white circle displayed in the center of a black background on a computer monitor. The circle randomly moved in 4 different directions (up, down, right, and left) at 5 different velocities (8°/second, 16°/s, 25°/s, 32°/s, 50°/s). Three subjects (9-14 years old) participated in the study and they were required to have 5-6 visits. At each visit, they were blindfolded and first received about 30 minutes training in object detection and pattern recognition before they performed the motion detection task. Each subject performed multiple sessions of the motion detection task after one session of motion detection training. The subjects initiated movements of the stimulus circle after they perceived the circle, and then report the direction of the movement after each movement through a game device. All data were recorded by an Eyelink data collection computer for offline analysis. Percent of correct perception of the movements were calculated for each of the subjects.
The correct motion detection in all directions to all velocities was 91% (85%-100%), 35% (20%-65%), and 25% (20%-30%) in 3 different subjects.
our preliminary results show that tongue’s tactile motion detection sensitivity is high, although it varied among subjects.
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