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"...there's a great affinity between writing poetry and SF."
- Dan Simmons

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!
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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