I purposefully chose the "Edina High School" article for you. I might also add that the details there are from certified Psychologists/Teachers employed by the

I purposefully chose the "Edina High School" article for you. I might also add that the details there are from certified Psychologists/Teachers employed by the School (AP Psychology teacher Heidi Mathers and Edina High School psychologist Samantha Bialozynski). It is highly relevant since it talks about the effects on school students/teens who are the primary market for the horror film genre. These psychologists have more data and are in a better position to observe behavioural changes day-to-day than in outside studies. I don't think you are capable of understanding more nuanced studies done by NIMH etc. However, i did give a well-respected and often-cited study by Kristen Harrison and Joanne Cantor in the other link. You are encouraged to read the original study (mentioned in the article) for edification.