An example of the latter is the postage stamp-sized device called the BrainPort, which works by delivering tiny electrical shocks to the tongue via a small grid that sits on the tongue. A blind subject wears sunglasses with a small camera attached. Camera pixels are converted into electrical pulses on the tongue, which feels something like the fizz of a carbonated drink. Blind people can become quite good at using the BrainPort, navigating obstacle courses or throwing a ball into a basket. One blind athlete, Erik Weihenmayer, uses the BrainPort to rock climb, assessing the position of crags
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