Kendler, Neale, Kessler, Heath, and Eaves (1992) have argued from data comparing monozygotic with dizygotic twins that the genetic factor common to all phobias (agoraphobia, social phobia, and specific phobias), strongly predisposes a person to specific phobias.
Kendler, Neale, Kessler, Heath, and Eaves (1992) proposed from comparative data on monozygotic and dizygotic twins that the shared genetic element contributing to all phobias (agoraphobia, social phobia, and specific phobias), significantly increases a person's likelihood of developing specific phobias.