The acquisition of information about, or response to, an external event, object or influence (mental or physical; past, present or future) otherwise than through any of the known sensory channels; used by J. B. Rhine to embrace such phenomena as telepathy, clairvoyance and precognition; there is some difference of opinion as whether the term ought to be attributed to Rhine, or to Gustav Pagenstecher or Rudolph Tischner, who were using the German equivalent aussersinnliche Wahrehmung as early as the 1920s. [From the Latin extra, “outside of,” + sensory]