[Gondring]

I was shocked at how much more I could remember after a sugar load. 2 the first time, 7 the second. It made a big difference for most people.

Did he try reversing it, doing the sugar-loaded trial first? Or do two trials, without sugar loading, to test the effects of practice?

Another fun variant is doing backward digit-span tests, where they have to repeat the sequence in reverse. This ties into mental processing rather than just memory.

[lizma]

Did he try reversing it, doing the sugar-loaded trial first?

Yep, half the sample size. Same results. I'll run your other suggestions by my son in case he wants to redo it for this years fair. Thanks.