Interstate Traveler Company
Building the World Wide Hydrogen Super
Highway...
|
Building the World Wide Hydrogen Super
Highway...
|
|
Gallery
◊ ◊ ◊ ◊ ◊
◊
◊
◊
◊
◊
◊
◊
◊
◊
◊
◊
◊
|
According to Van Nostrand's Scientific Encyclopedia, 1958, Third Edition LOB Catalog Card # 58-7085 Electroencephalogram the recording of action potentials of the cerbral cortex, by means of electrodes applied to the scalp and connected to the amplifying and recording apparatus. The degree of amplification is from 1 to 2 million times. The electrical discharges of the cerebral cortex vary in amplitude and frequency; those orginaly described by Berger consist of waves whose amplitude corresponds to a voltage of about 50 microvolts, but showing rhythmic variation in amplitude and with a frequency of about 10 per second( Alpha Waves). The are found in the occipital area of the scalp and disappear when the eyes are open. Beta Waves occur namely over the frontal and temporal lobes and are of lower voltage and higher frequency. Certain other waves may be found in normal subjects, but in many disease of the brain, especially epilepsy and cerebral tumors, vary slow Delta Waves of high voltage may be seen; occasionally, as an epileptic seizures, similar waves of vary high frequency may occur. In tumor, the appearance of such waves is confined to the area immediately surrounding the tumor; hence electroencephalography has some ancillary value in localization of cerebral tumors. |
|
Send mail to
CompanyWebmaster
with questions or comments about this web site.
|
