| AU | Description | Facial muscle | Example image |
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| 2 |
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| 4 |
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| 5 |
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| 9 |
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| 22 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 41 |
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| 42 |
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| 43 |
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| 44 |
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| 45 |
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| 46 |
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| 52 |
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| 53 |
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| 54 |
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| 55 |
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| 56 |
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| 57 |
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| 58 |
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| 61 |
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| 62 |
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| 63 |
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* AUs (Action Units) underlined bold are currently recognizable by AFA System when occurring alone or cooccurring.
** The criteria has changed for this AU, that is, AU 25, 26 and 27 are now coded according to criteria of intensity (25A-E) and also AU 41, 42 and 43 are now coded according to criteria of intensity