An illuminating investigation of core body temperature regulation and its powerful effect on human civilization.
A hot cup of tea, coffee, or cocoa is calming and comforting—but how can holding a warm mug affect our emotions? In Heartwarming, social psychologist Hans Rocha IJzerman explores temperature through the long lens of evolution. Besides breathing, regulating body temperature is one of the most fundamental tasks for any animal. Like huddling penguins, we humans have long relied on one another to maintain our temperatures; over millennia, this instinct for thermoregulation has shaped our lives and culture.
Temperature contributed to our evolution—our upright walking, our loss of fur, and our big brains—and now continues to affect our lives in unexpected ways, and the link from a warm mug to our emotions is anything but straightforward. Studies have shown, for example, that a chilly deliberation room can predispose a jury to convict and that a cold day can make us more likely to buy a house. Our mind-body connection works the other way, too: thinking about friendly or caring people can make us feel warmer. Understanding how we subconsciously strive to keep our temperature in an optimal range can help us in our relationships, jobs, and even in the world of social media.
As IJzerman illuminates how temperature affects human sociality, he examines fascinating new questions: How will climate change impact society? Why are some people chronically cold, and others overheated? Can thermoregulation keep relationships closer, even across a distance? The answers offer new insights for all of us who want to better understand our bodies, our minds, and each other. Heartwarming takes readers on an engaging journey through the world, seen from the perspectives of coldness and warmth.
Thermoregulation is the ability of an organism to keep its body temperature within certain boundaries, even when the surrounding temperature is very different. A thermoconforming organism, by contrast, simply adopts the surrounding temperature as its own body temperature, thus avoiding the need for internal thermoregulation. The internal thermoregulation process is one aspect of homeostasis: a state of dynamic stability in an organism’s internal conditions, maintained far from thermal equilibrium with its environment (the study of such processes in zoology has been called physiological ecology). If the body is unable to maintain a normal temperature and it increases significantly above normal, a condition known as hyperthermia occurs. Humans may also experience lethal hyperthermia when the wet bulb temperature is sustained above 35 °C (95 °F) for six hours. The opposite condition, when body temperature decreases below normal levels, is known as hypothermia. It results when the homeostatic control mechanisms of heat within the body malfunction, causing the body to lose heat faster than producing it. Normal body temperature is around 37 °C (99 °F), and hypothermia sets in when the core body temperature gets lower than 35 °C (95 °F). Usually caused by prolonged exposure to cold temperatures, hypothermia is usually treated by methods that attempt to raise the body temperature back to a normal range. (read more about thermoregulation on wikipedia >>)