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"I've got this beautiful panoramic three-dimensional painting of Mars based on Martian photos. It's 30 feet wide. You can pick out every pebble on the Martian landscape. And who'd have dreamed you could do that?"
- Arthur C. Clarke

Cephalotropic Dart  
  A slim, short-range device that homes in on the brain wave pattern of the target.  

One after another, the cigarillos were cut open by Theodoric's men, inspected ... the fifth one turned out to be hard; it did not yield to the sharp-bladed pocket knife, and, a moment later, a more complex analytical device showed the cigarillo to be a homeostatic cephalotropic dart.

"Whose Alpha-wave pattern?" Theodoric Ferry asked Dosker.

"Yours," Dosker said tonelessly. He watched without affect as the two decayed-eyed but very expert employees of THL crushed the dart under heel, rendering it useless.

From Lies, Inc., by Philip K. Dick.
Published by Fantastic in 1964
Additional resources -

Philip K. Dick was fascinated by the idea of devices that made use of brain wave patterns; he re-used this idea in his 1969 story The Electric Ant. See the entry for ident dart.

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Additional resources:
  More Ideas and Technology from Lies, Inc.
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to Lies, Inc.
  Tech news articles related to works by Philip K. Dick

Cephalotropic Dart-related news articles:
  - DARPA's 'Biometrics-At-A-Distance' Knows You By Heart

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