1. A system for the detection of stroke in a subject, the system comprising: an electrical stimulator configured to apply a current comprised of pink noise to at least one pair of electrodes, the electrodes configured to be positioned on a skull of the subject to apply the current and to receive brain activity of the subject; an analog to digital (A/D) converter configured to record the brain activity of the subject in the form of spectral electrical impedance tomography recordings and electroencephalography recordings, simultaneously; and a computer system configured to generate real time spectral electrical impedance data from the spectral electrical impedance tomography recordings, the spectral electrical impedance data indicating an impedance change within the brain of the subject, wherein the impedance change is associated with an indication of stroke.