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> thats also not about processing and reacting to signals > not an information processing system in the same sense

I can only assume you have some sort of philosophical objection here, but this is information processing.

Neurons are reacting to a range of chemical signals not just a single neurotransmitter because they don’t map to what CS style neural networks. Understanding the brain requires understanding the nuances not simplified models.

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I think it modulates information processing, the endocrine system does deliver information but it's internally recieved.

The key word is modulation.

Thats why I would not add the endocrine system as a system 3 or whatever.

DNA copying is also an information processing system but it's not considered in cognitive psychology but transcription factors will greatly effect behavior also.

But in the case of rats I would agree, their brains have more advanced olfactory systems and they communicate directly via pheromones to each other using the endocrine system.

But it humans that processing is more nuanced and the olfactory system is less advanced.

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