The final section of this chapter will give a list of requirements. These anxieties can be gotten from a bad experience or learned from someone else, parents for example. These can be treated by repeated exposure to the stimulus. In the biological theory, the phobia is represented in the brain as a biological entity. Some combination of different chemicals and hormones can affect a part of the brain when the person experiences anxiety.
Existential theory provides a model for generalized anxieties.
These are disorders where there is no specific stimulus that causes the anxiety disorder. Central to this theory is that the subject becomes aware of a profound nothingness in his life. This theory is the most studied and used theory for treatments of phobias. Because it is the most studied and used theory, it also gives the best description of how to use the theory. This makes it easier for us to use it when treating people with Virtual Reality.