Part of it is a phenomenon called ‘Lateral inhibition’. In essence, pain, temperature, and texture information from your nerves can’t be sent at full volume to your brain. The more senses that get activated in a specific area, the quieter each one gets. Pain receptors activate the fastest, so they start at 100% and then get muted as the other senses realize they should be talking to your brain too.
tldr: Imagine all your senses as people talking to you at a party. It’s harder to pay attention to a specific voice as more background voices get in the way.
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