Abstract: A system (2) for evaluating the efficiency of therapeutic treatments of patients (40) located at remote sites (6) by communicating a cognitive task to the remote site via a network (10) which provides two-way communication between a central analysis site and the remote sites, presenting the task to the patient before, during, or after carrying out a therapeutic intervention or treatment, detecting brain response from the patient, and communicating this response to the central analysis site via the network.

Abstract: A method and apparatus for testing the anesthetic depth or consciousness of a subject by directing visible red stimulus signals at the eyes of the subject through closed eyelids at accurately known frequencies. An electroencephalographic (EEG) signal is then obtained and a discriminator (18) is used to accurately detect components at the applied frequencies. An assessment is then made by comparing the magnitude or phase of the components of the EEG signal at the predetermined frequencies with correspondingly obtained EEG signals which have been obtained prior to administration of anesthetic to the subject.