Synapse, Neuron, Brain by A.C. Damask (Auth.)

By A.C. Damask (Auth.)

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M u c h research has gone into this area, but there is a sense of incompleteness of approach even if a specific goal is achieved. In general, with the help of a Fourier transform, we can define a power spectrum, that is, the energy distribution (proportional to the square of the wave amplitude) as a function of frequency (see p. 196). The frequency analysis of the waves and their changes can be m a d e for different conditions. F o r a review of the mathematics of this technique, see, for example, van der G o n and Strackee (1966).

39. 31 SURVIVAL VALUE OF CEREBRAL DOMINANCE SURVIVAL VALUE OF CEREBRAL DOMINANCE Accepting the situation that in any group of organisms there will be variations (that is, if there is cerebral lateralization, there can be left-handers as well as right-handers), why is there cerebral dominance at all? W h a t was its survival value in evolution? Ernst Mach, the 19th-century physicist and pioneer in psychophysics, devoted much of his attention to this question (1914). M a n y modern ideas are rooted in his considerations.

7. It is seen that very little is gained in accuracy in going from 10 to 20 parameters. Thus, an easily storable number, 10, can be used to describe a segment. Note that in this example the original spectrum is not given, only that there are three peaks in the power spectrum. The general method used is as follows. The signal value of the E E G at each point in time can be expressed as a weighted sum of the values of a fixed o 10 20 Frequency (Hz) F I G . 7 P a r a m e t r i c representation of an E E G power spectrum containing three peaks, p, the n u m b e r of p a r a m e t e r s used, and their c o r r e s p o n d i n g forms.

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