FIGURE 4.

Current practice of clinical EEG for outpatient procedures. EEG is routinely assessed in clinical inpatient, outpatient, and ambulatory procedures. While it is largely utilized for epilepsy and seizure diagnosis, many different patient groups are assessed (largely to rule out epilepsy). Outpatient procedures utilize an array of 21 scalp electrodes, and the EEG technologist assesses resting activity, photic stimulation, hyperventilation, and light sleep in less than 2 hr. The photic stimulation arm is shown here. Video recording is commonly embedded with the signal (white sphere with black circle at top). These features demonstrate that the infrastructure already exists to capitalize upon any novel task based assessment of an EEG feature that contributes to diagnosis or prognosis for neurological or psychiatric disease