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Simply showing that there is information about actions, actors (and their conjunction) in any part of the brain does not mean they have tackled a "(three-fold) challenge". One would find (presumably) very similar response properties in any part of the mirror neuron system. Furthermore, if one analysed retinal cells, one would also find this information. Perhaps you could highlight the fact that you have found information or invariance properties at the level of the single neuron - that could not be found at low levels in the visual hierarchy - to make your point more clearly?