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This brain area is known to send projections to a site in the brain’s medulla, the raphe pallidus, which promotes increases in body temperature.

The strength of the peak from the trigger network predicts the strength of the subsequent activation in the dorsal raphe’s exploitation-network neurons.

The region, known as the dorsal raphe nucleus, or D.R.N., is best known for its link to depression.

The animals were euthanized after testing and TPH2 levels measured in a section of the brain called the dorsal raphe nucleus.

In experiments with mice, Vanderbilt University biologists say they traced SAD to a small region of the mid-brain called the dorsal raphe nucleus.