David J. Linden Famous Quotes
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Male Amazon river dolphins will even insert thier penises in each other's blowholes in the only known example of nasal sex.*
*I refuse to make the obligatory "blowjob" joke here. Science writing is very serious business.
On average, dopamine receptor density is reduced in the VTA target regions of obese subjects as compared with those lean subjects (a characteristic that can be measured in a brain scanner). But the key question remains: Do obese individuals show reduced dopaminergic activation of VTA target areas in response to food? Is a blunted pleasure response to food involved in obesity?
Clearly, Siberian reindeer are not fighting over drugged urine for its nutrative value.
Experiements that have been devised to inflict even mild social pain (like exclusion form a group task or betrayal by a partner in a gambling game) have demonstrated significant activation of the sinula and the anterior cingulate cortex. Emotional pain isn't just a metaphor: In terms of brain activation, it partially overlaps with physical pain.
Human sexual and social behavior shares some similaries with that of rodents, but has some important differences as well. It shows much greater variability and individuality, for example, and is less closely tied to the olfactory system. At present, it is tempting to speculate that those of us with cheatin' hearts might have differences in brain dopamine, vasopressin, or oxytocin signaling when compared to our more faithful friends who have adopted the prairie vole lifestyle.
