Performance evaluation of the MouthPad

MouthPad is a tongue-computer interface, which enables the control of a computer pointer through tongue movements, in a joystick like manner. The movement of the tongue is monitored via an electrode array, placed on the palate; the contact impedance between the anterior tongue and the electrodes provides the position of the tongue relative to the electrode array. The performance of the device was evaluated in 6 able-bodied subjects, using a multi-directional point-select task. The throughput was calculated according to ISO 9241-9 guidelines. Accuracy was evaluated using measures like target reentry and movement offset. The results obtained were comparable to those of similar evaluations of computer joysticks.