Empathy
Empathy was the capacity to sense strong emotions of another being from their perspective. It could also refer to a type of extrasensory perception in which one can directly detect the emotions of another; such an individual was known as an empath. Empathic powers were often associated with telepathy.

Species in which empathic abilities were normal included the Betazoids (and Betazoid hybrids), Deltans, Haliians, Kwejians, Lumerians, and Napeans. (; ; ) 

Gem's species was empathic, and further possessed the ability to transfer the wounds of others onto themselves. () In Kelpiens, empathy was a defining trait hard-wired in their DNA, linked to their ganglia responding to shifts in their environment. ()

In 2365, Deanna Troi described Doctor Katherine Pulaski's greatest medical skill to be her empathy. ()

In 2366, Reginald Barclay created a hologram of Deanna Troi, named the "Goddess of Empathy". ()

Berlinghoff Rasmussen claimed to Deanna Troi in 2368 that some of his closest friends were empaths. ()

In 2373, Kes told The Doctor, who was malfunctioning, that empathy and kindness were basic to all forms of life. ()

Appearances 
All the TNG episodes listed here with empathy is done by Deanna Troi, unless otherwise stated. Troi uses her empathic abilities in roughly half (49 percent) of TNG's 178 episodes. 
 
  (Season 2)
  (Season 3)
 
  (Pilot, Season 1)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  (Troi & Armus)
 
 
  (Season 2, Troi & Ian)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  (Season 3)
 
 
 
  (Troi & Ral)
 
 
 
 
 
 
  (Troi & Tam)
 
 
  (Season 4)
 
 
  (fake Troi uses empathic powers)
 
 
 
 
 
 
 
  (Season 5)
 
 
 
 
 
 
 
 
 
 
  (Kamala) 
 
 
  (Season 6)
 
 
 
 
  (mention only)
 
 
  (Season 7)
 
 
 
  (Picard felt Beverly's fear of heights)
 
 
 
 
 
 
 
 
 
  (Troi attempted to read Soji Asha's emotions, but was unable to do so)

See also 
 Empathic metamorph
 Mind meld

External link

de:Empathie
ja:エンパシー
Psychology
Physiology