Learn Morse Code In 4 Hours From Taps On Your Head

Learn Morse Code In 4 Hours From Taps On Your Head

A new system can teach people Morse code within four hours using a series of vibrations felt near the ear.

Participants wearing Google Glass learned it without paying attention to the signals—they played games while feeling the taps and hearing the corresponding letters. After those few hours, they were 94 percent accurate keying a sentence that included every letter of the alphabet and 98 percent accurate writing codes for every letter.

The system uses passive haptic learning (PHL), a method that has previously taught people to read braille and to play the piano. It also improved hand sensation for those with partial spinal cord injury.

Researchers decided to use Glass for this study because it has both a built-in speaker and tapper.

Participants played a game while feeling vibration taps between their temple and ear. The taps represented the dots and dashes of Morse code and passively “taught” users through their tactile senses—even while they were distracted by the game.

“[C]ommon devices with an actuator could be used for passive haptic learning,” says Thad Starner. (Credit: Georgia Tech)The taps were created when researchers sent a very low-frequency signal to Glass’s speaker system. At less than 15 Hz, the signal was below hearing range but, because it was played very slowly, the sound was felt as a vibration.

Half of the participants in the study felt the vibration taps and heard a voice prompt for each corresponding letter. The other half—the control group—felt no taps to help them learn.

Participants were tested throughout the study on their knowledge of Morse code and their ability to type it.  After less than four hours of feeling every letter, everyone was challenged to type the alphabet in Morse code in a final test.

The control group was accurate only half the time.  Those who felt the passive cues were nearly perfect.

“Does this new study mean that people will rush out to learn Morse code? Probably not,” says Thad Starner, professor at Georgia Tech. “It shows that PHL lowers the barrier to learn text-entry methods—something we need for smartwatches and any text-entry that doesn’t require you to look at your device or keyboard.”

Previous research on PHL used custom hardware to provide the tactile stimuli, but here researchers use an existing wearable device.


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“This research also shows that other common devices with an actuator could be used for passive haptic learning,” Starner says. “Your smartwatch, Bluetooth headset, fitness tracker, or phone.”

“In our Braille and piano PHL studies, people felt vibrations on their fingers, then used their fingers for the task,” says Caitlyn Seim. “This study was different and surprising. People were tapped on their heads, but the skill they learned was using their finger.”

Seim’s next study will go a step further, investigating whether PHL can teach people how to type on the trusted QWERTY keyboard. That would mean several letters assigned to the same finger, rather than using only one finger like Morse code.

Researchers presented the results in Germany at the 20th International Symposium on Wearable Computers. The National Science Foundation supported the project.

Source: Georgia Tech

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