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"The whole problem of energy sources is going to be solved by little solutions, not by some big new piece of technology that does everything. We got into this crisis by believing that we had one big piece of technology that would do everything (oil)."
- Gregory Benford

Mind-Shield  
  A mental defense or barrier that prevents access to one brain by another person or device.  

As far as I know, this is the first use of the term, if not the concept.

"You will lower your mind shield. Of course, I don't expect absolutely free access to your brain. I have no objection to your controlling your thoughts on a narrow range all around the subject. But your shield must go down - now!
Technovelgy from Slan, by A.E. van Vogt.
Published by Astounding Science Fiction in 1940
Additional resources -

You can find a similar idea in Gray Lensman, the 1942 novel by E.E. 'Doc' Smith - namely, the thought-screen.

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Additional resources:
  More Ideas and Technology from Slan
  More Ideas and Technology by A.E. van Vogt
  Tech news articles related to Slan
  Tech news articles related to works by A.E. van Vogt

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