What role does the thalamus play in the perception of warming and cooling?

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thermoreception in polar bears — Thermoreception Warm-blooded animals, such as polar bears, maintain stable body temperatures and adapt to substantial geographic and seasonal temperature fluctuations. Thermal adaptation is supported by the function of sensory structures called thermoreceptors.

In the physiology of thermoreception, the thalamus serves as a critical relay station for temperature information traveling from the spinal cord to the brain.

The thalamus contains a compact set of neurons that receive input from the lateral spinothalamic tract. These neurons are organized into a three-dimensional, topographic map of the body, allowing them to process specific thermal information. Research indicates that these thalamic neurons possess selective thermoreceptive properties; when stimulated during neurosurgical procedures, patients report discrete sensations of warming or cooling localized to specific body parts.

Ultimately, the thalamus functions to relay this thermoreceptive activity to a dedicated site in the cerebral cortex—specifically the posterior insular cortex—where the actual perception of skin temperature is processed.1