Beschreibung:
<jats:p>In the EEG patterns of sleeping subjects, some shift in frequency is typically (perhaps invariably) seen as part of a response to sounds. (Davis—K complex). Obviously, the clear identification of any such single component is an aid in the detection of the total response to which it contributes. A method has been developed for simultaneously recording both a single EEG trace (from a pair of electrodes) and the frequency changes of that trace. This method records frequency by counting the number of times per second the EEG activity crosses its own baseline and of course is independent of amplitude. The inkwriter of the frequency recorder rises and falls as the EEG frequency rises and falls. The cortex is considered to have demonstrated an acoustic response whenever the recorder produces a rise or fall significantly different from the shifts occurring prior to stimulation. The method for this analysis will be discussed.</jats:p>