Download Clinical Electroencephalography and Topographic Brain by Frank H. Duffy M.D., Vasudeva G. Iyer M.D., D.M., Walter W. PDF

By Frank H. Duffy M.D., Vasudeva G. Iyer M.D., D.M., Walter W. Surwillo Ph.D. (auth.)

Electroencephalography is actually an interdisciplinary exercise, regarding techniques and methods from numerous assorted disciplines. incorporated are uncomplicated physics, neuro­ body structure, electrophysiology, electrochemistry, electronics, and electric engineer­ ing, in addition to neurology. Given this fascinating and various mix of components, the teach­ ing of an EEG technician, a neurology resident, or an EEG researcher within the fundamentals of scientific electroencephalography offers an unusual problem. within the realm of expertise, it truly is particularly effortless to acquire a technically sufficient EEG just by studying to stick with a protocol and by way of safely atmosphere some of the switches at the EEG computing device on the correct time. yet event has proven that the power to acquire top quality EEGs on a regimen, day by day foundation from a wide selection of sufferers calls for realizing and information past what's discovered via rote. Likewise, wisdom above and past what's won by means of uncomplicated participation in an EEG analyzing is important to properly and comprehensively interpret the checklist. Such wisdom comes from an figuring out of the elemental rules upon which the perform of medical EEG is based - rules that derive from a few of the disciplines cited.

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RJI + R21 + R31 which means that V, the output voltage of the amplifier, is equal to the sum of the voltages across each of the resistors. In other words, the total voltage divides itself across the three resistors in proportion to their values. If R J , R 2 , and R3 were all equal to each other, the voltage at the top of R3 would be equal to 1/3 V. With the three-position switch at the top of R2 , as shown in Fig. 3, the output of the switch is 2/3V. The chain of resistors wired to a switch in this fashion is referred to as a voltage divider.

3 What is the cutoff frequency for the series R-C circuit considered earlier in the computational example when R = 10K ohms and C = 1 JlF? 8. Frequency response of a series R-C circuit. flat from 20 to 20,000 Hz. Low-fidelity systems, on the other hand, severely attenuate frequencies at both ends of the frequency spectrum so that the range of audible frequencies actually transmitted may be limited to only 100 to 8,000 Hz. Although the frequency response of a circuit may be obtained empirically by applying an alternating voltage of variable frequency but constant amplitude to the input and then measuring the amplitude of the output, we may also calculate the frequency response from the circuit parameters.

Thus, an event that occurs at any of the electrodes connected to input 2 of the amplifiers will appear in each and every channel. This means that it is all but impossible to obtain multichannel, bipolar recordings using single-ended amplifiers. It should be clear from the foregoing discussion that EEG recording as we know it today would not be feasible if only the single-ended amplifier were available. To overcome the serious shortcomings of the single-ended amplifier, the push-pull amplifier and the differential amplifier were developed.

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