There are some questions that seem to cross everyone's mind at least once:
Why do we get scared?
Why do we like watching horror movies?
Why is violence appealing to us?
Well fear is a natural emotion, such as joy or anger, and it is induced by a perceived threat. Fear is the ability to recognize danger leading to an urge to confront it or flee from it (fight or flight response). In extreme cases of fear a freeze or paralysis response is also possible.
Why does this happen?
Fear is actually a very good thing, and believe it or not evolved in humans through natural selection over time. The ability to recognize and fear dangerous situations is helpful, and being careful is generally a good way to go about handling situations.
How does it work?
Fear is a natural response by the body and is produced by the amygdala, a region behind the pituitary gland, in the brain. In response to a threatening stimulus the amygdala generates the secretion of hormones that influence fear and aggression, and they put the body in a state of alertness leading to teh fight or flight response. The hormones associated are epinephrine, norepinephrine, and cortisol which all are secreted by the adrenal glands and are commonly referred to as adrenaline After the fear producing situation the amygdala and hippocampus record the event through
synaptic plasticity by activating neurons in the region. This plasticity is
what generates fear conditioning and promotes a more efficient and effective
fear response the next time the body is faced with a similar situation.
Interestingly, according to Glenn Sparks, a professor at Purdue University,
the fear you feel when watching someone being chased by an axe-wielding
murderer is no different than the fear you would experience when actually being
chased. When people watch horrific images their heartbeat increases as much as
15 beats per minute, their palms sweat, their skin temperature drops several
degrees, their muscles tense, and their blood pressure spikes.
But why would we enjoy this feeling?
This question has been asked by many people for many years but the answer lies in the composition of the brain and its response to stimulus. The amygdala is responsible for processing both pleasure and fear in the brain. The beginning of the processes being the same for love, pleasure and fear. As the amygdala begins pumping, the sensory information is sent to the prefrontal cortex where the brain begins to process the situation and determine the relative danger. This means that until your brain makes an evaluation, you are experiencing both pleasant and unpleasant emotions at the same time in response to the stimulus. In the case of watching a horror movie, the apparent danger observed from the screen starts the amygdala working and emotions begin flowing, but as the prefrontal cortex determines that no danger to the body is present in the situation, the spillover from the amygdala is rewarding and not frightening. The pleasant emotions win out and the adrenaline response of the body becomes a positive experience.
So as you can see, even while we are watching a fellow human succumbing to a horrible fate, we are experiencing pleasure and a sort of adrenaline high as a result of an evolutionary undertaking that produced an association between the fear and pleasure responses in the brain. Thank you Evolution! Now I have scientific reasoning for going to see Paranormal Activity!