There may be little variability in the bio-electrical-chemistry of the brain, but there is tremendous variability in the discipline of listening. Thats one reason why why one cartridge can sound genuinely great to 100 people but can sound just as genuinely awful to 20 others.
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"Therefore, we can describe the electrical properties of a neuron membrane in the physical terms of capacitors and resistors, and accordingly calculate the voltage and resistance of this membrane."