The reason why the neural activity you record from the two pins in the cockroach leg may have different sizes is because

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because you are recording from many nerve axons, some of which are close to the pins and some far away

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because you are recording from many nerve axons, some of which are myelinated and some are unmyelinated

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because you are recording from many nerve axons, some of which produce large APs and some produce small APs

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because you are recording from many nerve axons, some of which are small diameter and some are large diameter

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because you are recording from many nerve axons, with variable thresholds to produce APs (some low, some high and some in-between)

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