This trance is particularly characterized by extreme suggestibility and heightened imagination. There is a general consensus that heightened suggestibility is an essential characteristic of hypnosis. In practice, hypnotizability is measured as suggestibility following a hypnotic induction. Like hypnosis, there were also issues of suggestibility and interviewer influence. Children are particularly susceptible to forced confabulations based on their high suggestibility. Support for the dissociation model comes from studies showing heightened suggestibility in conversion patients. Tests subject to determine degree of physical and emotional suggestibility. Sometimes more extreme methods are used to increase suggestibility, such as sleep deprivation or drugs. Interrogators seek to increase a subject's suggestibility. Negative mood is shown to decrease suggestibility error. This manipulation was used to determine if participants were susceptible to suggestibility failure. Research has also found that it increases suggestibility and imagination. Loftus and Palmer's work into leading questions is an example of such suggestibility. Significant associations between parental attachment and children's suggestibility exist. Generally, suggestibility decreases as age increases.