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I think this is an excellent question. I am not an expert but my guess is that it must be something to do with the physical properties of materials which behave differently at different temperatures. Fatty substances become more fluid as they get warmer leading to a change in behaviour, from this I'd assume that the nervous system must have, as part of it, some thermo-reactive substance which are part of a causal chain which modify various electro-chemical signals in the brain.

To put it another way, the brain must 'know' that specific changes in signal quality from nerve endings are compatible with changes in temperature. A process which may be surmised from how we can asses the ambient outdoor temperature simply by recognizing behavioral signals of elements in the environment: Mist, frost, etc. Such experiences must also affect neurologically measurable chemical changes in our nerves.

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14y ago

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