The Uncanny theory is when something is portrayed to be something both familiar and unknown, something that is revealed but hidden at the same time, something that is inclosed but out in the open; it is the cognitive dissonance of two opposing words. Cognitive dissonance is the state of having inconsistent thoughts, beliefs, or attitudes, especially as relating to behavioural decisions and attitude change. For example, a church can be seen as a place of worship and safety, there is also a sense of acceptance amongst the people and it's an overall calm environment. However it can also be seen as a place that consists of death (funerals) and could be portrayed as a scary environment.
Barbara Creed- The Monstrous Feminine
This theory consists of the female being seen as the monster rather than the victim- the stereotypical monster is usually played as a male as men are seen as strong, quick thinking and are more suited to violent nature; on the other hand women are portrayed as victims as they are weaker and more vulnerable (stereotypically). Creed links the monstrous feminine in patriarchal society, (the Sirens, Medusa, movie monsters and witches. The monstrous feminine is more associated with male fears rather than the females desire and subjectivity.
The Fantastic- Tzvetan Todorov
This theory does not necessarily define horror, the approach that Tzvetan Todorov uses is very interesting and effective within horror films- this technique basically makes the audience hinder on whether what they are watching is normal or supernatural, this leads to the confusion of the audience and keeps them on the edge of their seats throughout the movie continuously inspecting every little detail- good and bad.