[nonsporting]

I take it as obvious. The clincher is the ST episode, SPOCK'S BRAIN, in which McCoy uses the "teacher" to greatly expand his mental capacity, much in the manner of 'Doc" in Forbidden Planet, but without the fatal result.

Two entirely different devices. The Krell device obviated the need for instrumentation. A brain boost was an unexpected side effect, not the intent of the device.

BTW, I hate the ST:TOS "Spock's Brain" episode. It was lame. There were however a few jewels, "Enterprise Incident", "Spectre of the Gun", and possibly "Plato's Stepchildren". But, there were too many stinkers, among the worst: "And the Children Shall Lead", "The Way to Eden" and "Spock's Brain."

[boop]

Why the hate on "Spock's Brain"? I know it's considered ne of the worst TOS episodes, but I enjoyed it.

For the trivia experts: the McCoy remote control device was made from "The Cage" episode's communicator.