In the original studies, most people made an error that can't be explained by that misunderstanding: they failed to select the card showing 'not y'.

From my armchair this feels relevant:

> Decoding analyses of neural activity further reveal significant above chance decoding accuracy for negated adjectives within 600 ms from adjective onset, suggesting that negation does not invert the representation of adjectives (i.e., “not bad” represented as “good”)[...]

From: Negation mitigates rather than inverts the neural representations of adjectives

At: https://journals.plos.org/plosbiology/article?id=10.1371/jou...