A psionic field is a bioelectrical energy field with a psychoactive effect. Modulating on a delta wave frequency, it is the "medium" through which unspoken thoughts and feelings are communicated through space. Some humanoids can tap into this field through a kind of sense organ located in the brain. The Betazoid paracortex is one example of this. In the same manner that eyes enable a person to sense portions of the electromagnetic field, telepathy involves sensing portions of the psionic field. (VOY: "Persistence of Vision")
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