The wall feels dry. I experience a qualia of dryness. Is it a raw sense? It seems like no — it has to do with texture, a certain roughness and non-stickiness.

I assume a baby starts out with just raw sensations and starts to build up higher level patterns. If a pattern repeats, it seems useful to group it as "that thing I saw before". If a pattern is followed by pain, it seems useful to associate it with the pain.

I think my body probably does have a raw sense for dryness if I'm actually dehydrated. Thirst seems like a raw sense. I wonder if the dryness I feel on the wall is ultimately an association between the textures I'm feeling, and the probability of thirst happening soon.

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