English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

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Premium Content

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Keyphrase Highlighting

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Summarisation

Insights

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PDF Analysis

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ZAIA

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In the version of this Letter originally published, in the sentence beginning “Written symbols are culture specific...”, in the second example, ‘Φ’ was used instead of ‘F’; it should have read ‘(for example, ℱ versus F)’. This has now been corrected in all versions of the Letter.

Publisher Correction: Letter perception emerges from unsupervised deep learning and recycling of natural image features