. Biophysical science. Biophysics. Classical Normal Recording in Normal Control Subject I3~l ~*AjM*tm*~*vf/t~~ 14-2 \*N***tom*~~*«K+-*>*Mt**\ f~K-^fr~^ 1-3 fi< *Vji jvmi ir 7-9 WwvvwkvwWVw,W'^^vMvi%Vw/A^—~ -**V-~W ~->T\WV*yW\*'*-*•*-*—rA^wywMwwvvwws I sec l50y,v Figure 6. Normal eeg patterns illustrating abolition of the a-rhythm with eyes open. If eyes remained open for longer period of time, the a-rhythm would build up again. Original figure of R. G. Bickford, , Mayo Clinic. many normal adults completely lack a-waves both on the scalp and on the cortex. Besides the a-rhythm
. Biophysical science. Biophysics. Classical Normal Recording in Normal Control Subject I3~l ~*AjM*tm*~*vf/t~~ 14-2 \*N***tom*~~*«K+-*>*Mt**\ f~K-^fr~^ 1-3 fi< *Vji jvmi ir 7-9 WwvvwkvwWVw,W'^^vMvi%Vw/A^—~ -**V-~W ~->T\WV*yW\*'*-*•*-*—rA^wywMwwvvwws I sec l50y,v Figure 6. Normal eeg patterns illustrating abolition of the a-rhythm with eyes open. If eyes remained open for longer period of time, the a-rhythm would build up again. Original figure of R. G. Bickford, , Mayo Clinic. many normal adults completely lack a-waves both on the scalp and on the cortex. Besides the a-rhythm, there are so-called "/?-waves" in the frequency range of 14-50 cps. They are always present in normal adults. The /3-waves are smaller in amplitude than the a-waves and are usually spindle shaped. In some adults, there are large voltage (50-100 /xv), slow (|-4 cps) S-waves, as well as slightly faster #-waves in the frequency range 5-7 cps. Both the 8- and the 0-waves are often associated with abnormalities. Although the eeg patterns are not the same for all normal adults, they do vary with the activity of the central nervous system. The most studied example is the a-rhythm, which occurs predominantly in the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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