Brain Phycology - Viewers have a large attraction to horror films and the horror genre as they love to be scared and feel fear. This is due to when a person is afraid, the amygdala, two neurones in the brain, send neurological messages to pump the body with dopamine and adrenaline. Dopamine and adrenaline are neurotransmitters or neurohormones which make the human body feel good. When the human body has large amounts of dopamine to can make you feel good. Adrenaline also gives people a 'rush' which causes senses to be heightened causing sweaty palms, and dilated pupils. This rush also provides the human body with a feel good sensation and can become something people are addicted to. This is the reason we keep watching horror films even though we know we are going to be scared by them.
The right amygdala in our brain processes emotions, survival instincts and memory and it is heightened when we see animals, especially reptiles and small creatures like rats. This is why many people have an appeal to Godzilla as it is a large reptile which heightens the part of the brain which produces the emotion of fear and adrenaline, something we now know people are attracted to.
The Uncanny is where something is familiar yet unfamiliar, it is a phenomenon used numerous amounts of time in the horror genre especially in physiological horror where it is made to create strange and unsettling sensations for the viewer. It is a key attraction to many horror lovers as it heightens the senses and brings up deep seated anxieties.
Movies such as the Curse of Chucky directed by Don Mancini use the "uncanny valley" to create fear. The "uncanny valley" is a phenomenon where people are repulsed and fear something which has similar appearances and features of those of a human such as human like robots. The character Chucky is an example of "uncanny valley" as he is a character with similar appearances to a human but it is in reality an evil doll.