A monofilament stimulator was a component of an electro-dynamic probe. With the proper modifications, it could be used to manipulate neurotransmitter levels in a Human brain.

During his investigation into Kovin's possible assault of Seven of Nine in 2374, The Doctor saw Kovin's electro-dynamic probe with a monofilament stimulator as corroboration for Seven's story. (VOY: "Retrospect")

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