Only if had a control where I tried to make things harder without using interleaved practice. I haven't done that, I have less reason to suspect that simply making learning harder would make you learn better.
All right. The thing is, I don't see how "flow is antithetical to interleaved practice" leads to "flow is a poor ideal for learning", so for me, the sentence "flow is a poor ideal for learning because flow is antithetical to interleaved practice" doesn't make sense.
Actually, I also don't see how flow is antithetical to interleaved practice. The article you linked to says that the "Mixers" (who used interleaved practice) were more successful than the "Blockers", but it doesn't seem to give much of a reason t...
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