Can Fear Really Be ‘Bloodcurdling’?

Researchers in the Netherlands have found that fear and horror movies can increase levels of a blood-clotting protein.

http://topartsentertainment.blogspot.com/ - The phrase bloodcurdling scream comes up often in detective novels. Now researchers say that fear actually can increase activity for a blood clotting protein.

Researchers at the Leiden University Medical Center in the Netherlands asked participants in a recent study to watch two movies: a horror film and an “educational” film. After each one, the researchers took blood samples. The results were published Wednesday in The BMJ’s annual quirky-but-true Christmas issue.

The 24 participants, all 30 years old or younger, watched Insidious (a scary movie from 2010 in which evil spirits mess with a child) and A Year in Champagne (a documentary from 2014 about how champagne is made). Fourteen of them watched the horror movie first; the other 10 began with the educational film. Participants waited a week between films and viewed them at the same time of day and in the same place (a makeshift movie theater in a university meeting room).

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“To reduce the risk of confounding by superstition, no movies were shown during a full moon or on Friday the 13th,” the researchers write in the study.

Participants rated the films on a scale of 0 to 10 for how scary they were. The mean difference between those ratings was 5.4. (Complex rated Insidious one of the scariest movies of all time.)

For the majority of participants (57 percent), the researchers found that levels of factor VIII, a blood-clotting protein, had increased during the horror movie. For the vast majority of participants (86 percent), factor VIII levels dropped while watching the educational movie.

The researchers believe their study is the first time anyone has extensively explored the science behind the phrase bloodcurdling, which they note also exists in other languages—“à vous glacer le sang” in France and “bloedstollend” in the researchers’ native Netherlands. Previous studies had examined the connection between physical stress and blood coagulation, but not acute fear, they say.

There is a biological reason why fear can affect blood-clotting activity, the researchers say: “This poses an important evolutionary benefit, by preparing the body for blood loss during life threatening situations.”

Perhaps next the researchers will see if anger really can make the blood boil.

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Can scary films literally curdle your blood?

A study has determined that there is some truth in the term "bloodcurdling fear".

http://topartsentertainment.blogspot.com/-The term "bloodcurdling" has been around since at least the early 19th century, used to refer to something that induces fear. Of course, no one ever actually thought your blood could curdle or coagulate from fear, but it seems there's at least a grain of truth in the term after all.

According to research conducted by a team at the Leiden University Medical Centre in the Netherlands and published earlier this week, watching horror films does actually cause an increase in a particular blood coagulant factor responsible for blood clotting.

The study was conducted on 24 healthy participants aged 30 or younger. These participants were divided into 2 groups, one of 10 participants, the other of 14. The group of 10 was assigned to watch a non-scary educational film followed by a horror film, and the group of 14 was assigned to watch the horror film followed by the educational film, viewed a week apart.

Before and after viewing each film, blood samples were taken from each participant. These samples were analysed for clotting activity, revealing an increase in coagulant factor VIII in more participants that viewed the horror film than watched the educational film.

"Levels increased in 12 (57 percent) participants during the horror movie, but only in 3 (14 percent) during the educational movie," the team wrote. "Levels decreased in 18 (86 percent) participants during the educational movie, but only in 9 (43 percent) during the horror movie."

This didn't result in actual clotting. Although there was an increase in one coagulant factor, there wasn't a corresponding increase in the proteins required for clotting to take place. So while the coagulation process can be kicked off from intense fear, it doesn't lead to the blood actually clotting in the veins.

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