a failure to cope with work, relationships, or education. Other features differentiate diseases with delusions as well. Delusions may be described as mood-congruent (the delusional content in keeping with the mood), typical of manic or depressive psychosis, or mood-incongruent (delusional content not in keeping with the mood) which are more typical of schizophrenia. Delusions of control, or passivity experiences (in which the individual has the experience of the mind or body being under the influence or control of some kind of external force or agency), are typical of schizophrenia. Examples of this include experiences of thought withdrawal, thought insertion, thought broadcasting, and somatic passivity. Schneiderian first rank symptoms are a set of delusions and hallucinations which have been said to be highly suggestive of a diagnosis of schizophrenia. Delusions of guilt, delusions of poverty, and nihilistic delusions (belief that one has no mind or is already dead) are typical of depressive psychoses. Overvalued Ideas An overvalued idea is an emotionally charged belief that may be held with sufficient conviction to make believer emotionally charged or aggressive but that fails to possess all three characteristics of delusion—most importantly, incongruity with cultural norms. Therefore, any strong, fixed, false, but culturally normative belief can be considered an "overvalued idea". Hypochondriasis is an overvalued idea that one has an illness, dysmorphophobia that a part of one's body is abnormal, and anorexia nervosa that one is overweight or fat. Obsessions An obsession is an "undesired, unpleasant, intrusive thought that cannot be suppressed through the patient's volition", but unlike passivity experiences described above, they are not experienced as imposed from outside the patient's mind. Obsessions are typically intrusive thoughts of violence, injury, dirt or sex, or obsessive ruminations on intellectual themes. A person can also describe obsessional doubt, with intrusive worries about whether they have made the wrong decision, or forgotten to do something, for example turn off the gas or lock the house. In obsessive-compulsive disorder, the individual experiences obsessions with or without compulsions (a sense of having to carry out certain ritualized and senseless actions against their wishes). Phobias A phobia is "a dread of an object or situation that does not in reality pose any threat", and is distinct from a delusion in that the patient is aware that the fear is irrational. A phobia is usually highly specific to certain situations and will usually be reported by the patient rather than being