1. In a tomographic imaging apparatus comprising X-ray means for scanning a portion of the central nervous system with X-radiation and detecting the X-radiation scanning the central nervous system, processing means for processing detected signals representing the radiodensity of various regions of the scanned body from the X-ray means and imaging means coupled to the processing means for generating an image representing the radiodensity of various regions of the central nervous system, the improvement comprising: memory means for storing and generating signals representing a predetermined electrophysiological condition of the central nervous system at various regions thereof including the spectrum of components in an electroencephalographic signal; detector means for detecting signals representing the actual electrophysiological condition of the central nervous systems at various regions thereof including means for spectrally analyzing the components of the detected electroencephalographic signal for the various regions; comparison means coupled to said memory means and said detector means for comparing the detected signals with the stored signals for said various regions of said central nervous system and generating signals representing the deviation of the detected signals in one of the regions from said stored signals for said one of the regions; and display means coupled to said comparison means and said imaging means for visually indicating said one of the regions representing said deviation on said image.