A brain-controlled 3D sonar scanner

We present a non-invasive brain-machine-interface (BMI) prototype system which allows the simple control of a switch. The main goal of the system, based on electroencephalogram (EEG) recordings, is to create mechanical action from brain activity. Experimental work presented in this paper outlines the operation of a system which is a crude imitation of an ultrasound echolocation based vision mechanism, commonly used by bats and dolphins, which is controlled by brain activity. Simple time-frequency-space domain signal analysis methods are employed to generate the electrical control-signal, while the sonar transducer is mounted on a robotic arm capable of scanning the upper hemisphere.