But while EEG's might be ideal to answer "when" questions about brain activity, they are not so good at answering questions about "where". Most EEG's use 10 or 12 electrodes attached by a tacky glue at scattered spots on the scalp, which record electrical impulses firing from the brain as a whole.
With sounds of lower frequency, the rate of impulses fired by the neuron reflects the stimulus frequency, and the response often reveals phase-locking with the stimulus; that is, the nerve fibres are stimulated at regularly recurring intervals, corresponding to a particular position or phase, of each sound wave.
Impulse discharge and firing frequency of activated nerve sensory fibers decreased to 65%and45%5% of that of control values, respectively, when hylan was administered [ 50].
And what it tends to prove is that it was not an uncontrollable irresistible impulse to fire when he did.
Case D: Reverend D-who had wild impulse to fire blank cartridges, lived near the Holland Tunnel and heard backfiring trucks.
Despite his move to New Hampshire in 1953, his aversion to publicity and his withdrawal from the New York scene, Mr. Salinger, by his own admission, could not always resist the impulse to fire off cranky letters to people who criticized his behavior, polite letters to schoolchildren who popped questions and flowery letters to women who caught his eye.
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Because nerve impulses are not graded in amplitude, it is not the size of the action potential that is important in processing information within the nervous system; rather, it is the number and frequency with which the impulses are fired.
The visual echo is a fitting one, since, whatever the private impulses that fired this work, there is no doubting Soderbergh's desire to shoot at ground level — not to linger on the loftiness of political ideals but, instead, to get down amid the dirt, sweat, and despair of putting them into practice.
