Phobias can be divided into specific phobias, social phobia, and agoraphobia. Desensitization is commonly used with simple phobias like insect phobia. Brain implants cause mental instability ranging from mild phobias to crippling neurosis or psychosis. The word "phobia" may also refer to conditions other than true phobias. This technique is often demonstrated by people who experience panic attacks or have phobias. Hypnotherapy can be used alone and in conjunction with systematic desensitization to treat phobias. Paranoia is distinct from phobias, which also involve irrational fear, but usually no blame. Flooding is a psychotherapeutic method for overcoming phobias. Depression, phobias, and reading disabilities have been examined in this context. Modeling has been used in dealing with fears and phobias. Various anti-national phobias and prejudices operate with ethnic stereotypes. Specific phobias, especially animal phobias, often develop in childhood. Critics have questioned the proposed innateness of certain phobias, such as fear of snakes. Jonathan Crane is a brilliant psychologist who specializes in fear and phobias. Fear of being buried alive is reported to be among the most common phobias.