Highly Effective for Simple Phobias – Flooding is particularly effective for specific phobias, as it prevents avoidance behaviour and leads to the extinction of the conditioned fear response. Supporting Research: Wolpe (1960) demonstrated the effectiveness of flooding when he treated a girl with a severe phobia of cars by forcing her to be driven around continuously. Initially, she was extremely distressed, but after a while, her anxiety subsided, and her phobia disappeared.