Symptoms and signs: Cognition, perception, emotional state and behaviour

Alice in Wonderland Syndrome (also known as Todd's syndrome, or lilliputian hallucinations) is a disorienting neurological condition that affects human perception.

Visual release hallucinations, also known as Charles Bonnet syndrome (CBS), is the experience of complex visual hallucinations in a person with partial or severe blindness.

Hysteria, in the colloquial use of the term, means ungovernable emotional excess.

Unconsciousness is a state which occurs when the ability to maintain an awareness of self and environment is lost.

A paracusia, or auditory hallucination, is a form of hallucination that involves perceiving sounds without auditory stimulus.

A minimally conscious state (MCS) is a disorder of consciousness distinct from persistent vegetative state and locked-in syndrome.

A hallucination is a perception in the absence of external stimulus that has qualities of real perception.

Syncope, also known as fainting, is defined as a short loss of consciousness and muscle strength, characterized by a fast onset, short duration, and spontaneous recovery.

Anhedonia (/ˌænhiˈdoʊniə/ AN-hee-DOH-nee-ə; Greek: ἀν- an-, "without" and ἡδονή hēdonē, "pleasure") is the inability to experience pleasure from activities usually found enjoyable, e.

Splitting (also called black-and-white thinking or all-or-nothing thinking) is the failure in a person's thinking to bring together the dichotomy of both positive and negative qualities of the self and others into a cohesive, realistic whole.

Vertigo is when a person feels as if they or the objects around them are moving when they are not.

Passive-aggressive behavior is the indirect expression of hostility, such as through procrastination, stubbornness, sullen behavior, or deliberate or repeated failure to accomplish requested tasks for which one is (often explicitly) responsible.

Obtundation refers to less than full alertness (altered level of consciousness), typically as a result of a medical condition or trauma.

A stereotypy (/ˈstɛriəˌtaɪpi, ˈstɪər-, -ioʊ-/, STAIR-ee-oh-TEYE-pee or STEER-ee-oh-TEYE-pee) is a repetitive or ritualistic movement, posture, or utterance.

Delusional parasitosis, also known as delusional infestation or Ekbom's syndrome, is a delusional disorder in which individuals incorrectly believe they are infested with parasites, insects, or bugs, whereas in reality no such infestation is present.

Dissociative fugue, formerly fugue state or psychogenic fugue, is a DSM-5 dissociative disorder.

Anosognosia (/æˌnɒsɒɡˈnoʊziə/, /æˌnɒsɒɡˈnoʊʒə/; from Ancient Greek ἀ- a-, "without", νόσος nosos, "disease" and γνῶσις gnōsis, "knowledge") is a deficit of self-awareness, a condition in which a person who suffers some disability seems unaware of the existence of his or her disability.

Allodynia (Ancient Greek άλλος állos "other" and οδύνη odúnē "pain") refers to central pain sensitization (increased response of neurons) following painful, often repetitive, stimulation.

Alcohol withdrawal syndrome is a set of symptoms that can occur when an individual reduces or stops alcohol consumption after long periods of use.

An aura is a perceptual disturbance experienced by some with migraines or seizures before either the headache or seizure begins.

Presyncope is a state consisting of lightheadedness, muscular weakness, blurred vision, and feeling faint (as opposed to a syncope, which is actually fainting).

Vegetative symptoms are disturbances of a person's functions necessary to maintain life (vegetative functions).

Autophony or tympanophony is the unusually loud hearing of a person's own voice.

Emotional detachment, in psychology, can mean two different things.

Waxy flexibility is a psychomotor symptom of catatonic schizophrenia which leads to a decreased response to stimuli and a tendency to remain in an immobile posture.

An intrusive thought is an unwelcome involuntary thought, image, or unpleasant idea that may become an obsession, is upsetting or distressing, and can feel difficult to manage or eliminate.

Clouding of consciousness, also known as brain fog or mental fog, is a term used in medicine denoting an abnormality in the regulation of the overall level of consciousness that is mild and less severe than a delirium.

A fixed fantasy — also known as a "dysfunctional schema" — is a belief or system of beliefs held by a single individual to be genuine, but that cannot be verified in reality.

Formication is the medical term for a sensation that exactly resembles that of small insects crawling on (or under) the skin.

A vagal episode or vasovagal response or vasovagal attack (also called neurocardiogenic syncope) is a malaise mediated by the vagus nerve.

Somnolence (alternatively "sleepiness" or "drowsiness") is a state of strong desire for sleep, or sleeping for unusually long periods (compare hypersomnia).

Coma is a state of unconsciousness in which a person cannot be awakened; fails to respond normally to painful stimuli, light, or sound; lacks a normal wake-sleep cycle; and does not initiate voluntary actions.

Suicidal ideation, also known as suicidal thoughts, concerns thoughts about or an unusual preoccupation with suicide.

Anosodiaphoria is a condition in which a person who suffers disability due to brain injury seems indifferent to the existence of their handicap.

Disorders of consciousness are organic mental disorders in which there is impairment of the ability to maintain awareness of self and environment and to respond to environmental stimuli.