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Telepathy was the ability to hear a person's thoughts, or send messages through the use of the mind. This ability was granted through the use of the Psionic field. It is unknown if all species use this, as it cannot explain telekinesis.

In the 23rd century, it was theorized that all sentient creatures were in fact telepathic but that only a small proportion had learnt to use this ability. (TOS novel: Unspoken Truth)

The Ferengi were resistant to most forms of telepathy. (DS9 episode: "The Forsaken")

Telepathic techniques and abilities

Background

According to Star Trek science consultant and writer André Bormanis, telepathy within the Star Trek universe works via the "psionic field", 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 (e.g. the paracortex). In the same manner that human eyes can sense portions of the electromagnetic field, telepaths can sense portions of the psionic field. (source)

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