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Re:Decapitated Worms Regrow Heads, Keep Old Memories by vxl on Saturday January 13, 2018 @07:10PM (#16142135)
>Headless fragments regenerated from familiarized worms displayed slightly shorter feeding latency compared with headless fragments from unfamiliarized worms ... However, the effect was not statistically significant.

So, no. But they do better with the refresher course than other worms if I understand correctly.

Re:Decapitated Worms Regrow Heads, Keep Old Memories by pbhjpbhj on Saturday January 13, 2018 @07:17PM (#16142169)
>However, the effect was not statistically significant. //

AKA - there's no effect as far as we can tell without further experiment.

Correction: the paper (http://jeb.biologists.org/content/early/2013/06/27/jeb.08780...) is talking about the worms before re-familiarisation. They claim significance for previously "trained" worms being faster at picking up the training post decap+regen.