Quote:
Originally Posted by Nagoyankee
どきどき is the onomatopoeia for "heart beat".
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And there's another onomatopoeia for "heart beat" as well: ワクワク. However, in this case, ドキドキ is more negative excitement, while ワクワク is more positive (as in the difference between ドキドキ about a speech you're giving, while ワクワク because your sister is having a baby).
At least, that's what I think the difference is. And maybe technically ワクワク isn't an onomatopoeia for a heart beat, but I've always lumped the two words together as the "same sound" even though they're maybe not.