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Can I see some evidence for that, please? Like, a peer reviewed study?
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Who was the sample of ‘people’?
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What is the distinction between different plants? Like, just kitchen fruits and vegetables I’d expect to be much more than 10, unless you group them all in ‘drupes’, ‘fruits’, etc
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Even if a random distributed sample of modern English speaking people do recognise more logos than plants, that’s likely because there’s a large advertising industry trying to make it so, whereas plant recognition is learnt in school or home.
That was fun!