By Prof. Dr. Konrad Maurer, Dr. Thomas Dierks (auth.)
From its discovery in 1929 by way of Hans Berger till the past due Sixties, whilst sensory visible and auditory evoked potentials have been dis coated and have become renowned, the EEG used to be crucial approach to neurophysiological exam. W-ith the appearance of machine know-how within the Eighties, it grew to become attainable to devise the aptitude fields of the EEG onto types of the scalp. This plot ting of data as neuroimages the structural and sensible recommendations of Cf, MRI, puppy and SPECf. The luck of this system, which started within the early Nineteen Eighties, has ended in the mind mapping of EEGs and EPs being more and more used for di agnosistic reasons in neurology, psychiatry and psychopharma cology. The pioneers of this technique believed in it and have been devote ted to its good fortune. even if, many traditionalists felt that it gave no new details and so looked the tactic with scepticism. a few stumbled on either the colored maps and the mapping strategy deceptive, which resulted in pointless clash among mappers and their chromophobic oponents. feelings have run so excessive that a few expert our bodies have justifiably followed guidance and warned of the misuse of the method.
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Extra resources for Atlas of Brain Mapping: Topographic Mapping of EEG and Evoked Potentials
EP Features Fig. 33. ' uU • I. 7 nents (e. without clinically relevant topographical features ' (Fig. 30). Of interest is the mapping of exogenous (N1, P1, N2, P2) and endogenous components (P300, slow wave). Corresponding EPs and their topography are presented in Fig. 31 a to c. 3 Mapping of Somatosensory Evoked Potentials Recording of somatosensory EPs offers a functional test of the integrity of the specific lemniscal somatosensory system. The primary cortex is organized somatotopically, which is important for mapping (Goff et al.
EPs are represented chiefly in the time domain. EP maps show the amplitude distribution on the scalp at defined latencies or time intervals. The advantage of measuring data in the time domain is the incorporation of information concerning wave shape and latency between events. 4 Frequency Mapping (Frequency Domain) Transformation of data from the time domain into the frequency domain was time consuming and tedious before it was possible to perform mathematical procedures in computers. Cooley and Fig.
The GFP or the potential difference between the maximal and minimal value in the field at the time that rhe GFP reaches its maximum. Fig. 23. Schema tic drawing for explanation of GFP. annels ha ve been used. 1V 6 Storing of Data Magnetic or optical media can be used to store EEG signals. Hard-disk systems are available that can store up to 300 Mbytes. Table 4 presents an overview of storage capabilities. Small inexpensive magnetic disks (diskettes) are widely used for personal computers, but only a small amount of EEG data can be recorded on each disk.