A study of periodicity and structure of EEG complexes in a case of SSPE.

This is a preliminary study of the EEG complexes of SSPE. This consisted of an analysis of the time and frequency domain of the complexes recorded in different test situations. The authors examined the periodicity of complexes and changes in the intercomplex interval succession and, in another approach, the shape of the complex and the constant properties of its structure. Analysing the findings obtained and the data of earlier authors, they suggested a working hypothesis according to which a regulated trigger mechanism 'sparks off' the structures 'sensitive' to this in different regions of the cortex, in which simultaneous and successive sub-processes lasting several hundred milliseconds then occur; the periodic complex appearing in SSPE is that part of this that can be observed in the EEG.