- You may have been looking for the TOS episode, The Empath.
Empathy is the ability to understand or feel the emotions of another being.
Some humanoids have extrasensory empathy. A Human-Betazoid hybrid is a known example of such empathy, as are Lumerians, Napeans and presumedly Deltans.
- This may be a psionic technique.
See also:
- Telepathy
- Mind melding