I'd also guess that non-native speakers are less likely to say "yes" to fake words. Non-native speakers are, presumably, more self-aware of the extents and limi

I'd also guess that non-native speakers are less likely to say "yes" to fake words. Non-native speakers are, presumably, more self-aware of the extents and limitations of their English vocabularies. Native speakers seem more likely to succumb to issues of vanity, overconfidence, or bet-hedging on this sort of test.