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Electroencephalography is a technique used to detect the electrical impulses formed in the brain.In the early days it was used for monitoring a person's health for signs of epilepsy or any head injury.Electroencephalography enabled the development of Brain Computer Interfaces (BCI) based AAC devices, but these devices are expensive costing thousands of dollars and are out of reach of the common population due to its high cost.Moreover, these BCI based AAC devices are bulky and difficult to carry around, making them quite a hassle for a disabled person to use.
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