[jacobolus]

How long did you stare at the test pattern?

For long-lasting effect mis-calibrating any of these low level visual recognizers, you need to look at the test pattern for quite a while. Just a minute or two isn’t going to prompt a long-term effect.

[dahart]

Ah, you're right. That part was left out of the warnings I got. "Jones and Holding (1975) found that 15 minutes of induction can lead to an effect lasting 3.5 months."

I don't remember how long I tried the first time, but I'm sure it was not longer than 2-3 minutes.

The article says an anti-McCoullough effect can override the first effect. Can you also undo or override one ME with another ME using opposing colors?