All feelings begin with a thought.
If by thinking, you can activate that part of the brain that controls the feeling response, you are a good candidate. Thus, for example, individuals who are phobic of spiders, if simply by thinking of spiders you can generate a fear response, you are a good candidate. Similarly, by using your mind to generate a fear, grief, anger, craving or just simply a distress response, you are a good candidate. In addition, the more specific the thought that produces the distress, the more likely it can be removed. Individuals with other co-existing psychiatric problems may or may not be good candidates.