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"You have to budget the number of fuzzy rules you use to control a system. It turns out, you can state the optimality principle in three words: 'patch the bumps.'"
- Bart Kosko

Cephalochromoscope (Cephscope)  
  A brain-scan device with a screen to display neural patterns.  

Dick created a device to let users see their own brain patterns recreationally during their leisure activities.

"Your cephalochromoscope that cost you nine hundred dollars, that you always turn on and play when you get home - Ernie and Barris were babbling away about it. They tried to use it today and it wouldn't work. No colors and no ceph patterns, neither one..."
Technovelgy from A Scanner Darkly, by Philip K. Dick.
Published by Doubleday in 1977
Additional resources -

Here's another fragment:

...some other nut or perhaps the same one imposing a brain-print of his own shorted-out upstairs on an incredibly expensive and valued cephscope that everyone in the house, plus all their friends, loved and enjoyed.

And another:

...his Altec cephalochromoscope, around which he had built the pleasure part of his schedule, the segment of the day in which they all relaxed and got mellow....

Finally:

And in Bob Arctor's living room his thousand dollar custom-quality cephscope crafted by Altec would, after supposedly being repaired, cast onto the wall in dull gray on one small spot:

I KNOW IF I JUST HAD ANOTHER HIT

After that they'd throw the cephscope, damaged beyond repair, and Jerry Fabin, damaged beyond repair, into the same ash can.

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Additional resources:
  More Ideas and Technology from A Scanner Darkly
  More Ideas and Technology by Philip K. Dick
  Tech news articles related to A Scanner Darkly
  Tech news articles related to works by Philip K. Dick

Cephalochromoscope (Cephscope)-related news articles:
  - IfIHadGlass - I'd Make PKD's Cephscope
  - Hitachi Brain Scanner Fun Toy
  - EEG Headset Is Parasitic Cephscope
  - Epoc Headset Brainwave Controller
  - SmartCap Detects Fatigue
  - Hair Brush Reads Your Mind
  - XWave Apps For iPhone See Brainwaves
  - Moran Cerf, When Will We Get Neuro Tech For Ourselves?
  - Get Your Own 64 Channel, Dry-Electrode Brain-Computer Headset!
  - Safilo Brain-Sensing Eyewear
  - Wearable MRI Is Former Occulus/Facebook Exec's New Project
  - New Brain Scanner Lets You Move Around
  - Neurodevices For Consumers? Neuroethicists (And Philip K Dick) Say 'Caveat Emptor'
  - NextSense Earbuds Spy On Your Brain

Articles related to Medical
Bone-Building Drug Evenity Approved
BrainBridge Concept Transplant Of Human Head Proposed
Natural Gait With Prosthetic Connected To Nervous System
Brain Implant Is Able To Capture Your Inner Dialogue

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