...more than one sensory modality), perceptual distortions, delusions (often of a paranoid or persecutory nature), psychomotor disturbances (excitement or stupor), and an abnormal affect, which may range from intense fear to ecstasy. The sensorium is usually clear but some degree of clouding of consciousness, though not severe confusion, may be present. Alcoholic:hallucinosis | jealousy | paranoia | psychosis NOS | Excl.: alcohol- or other psychoactive substance-induced residual and late-onset psychotic disorder (F10-F19 with common fourth character .7) .6 Amnesic syndrome A syndrome associated with chronic prominent impairment of recent and remote memory. Immediate recall is usually preserved and recent memory is characteristically more di ...[+++]sturbed than remote memory. Disturbances of time sense and ordering of events are usually evident, as are difficulties in learning new material. Confabulation may be marked but is not invariably present. Other cognitive functions are usually relatively well preserved and amnesic defects are out of proportion to other disturbances. Amnestic disorder, alcohol- or drug-induced Korsakov's psychosis or syndrome, alcohol- or other psychoactive substance-induced or unspecified Excl.: nonalcoholic Korsakov's psychosis or syndrome (F04) .7 Residual and late-onset psychotic disorder A disorder in which alcohol- or psychoactive substance-induced changes of cognition, affect, personality, or behaviour persist beyond the period during which a direct psychoactive substance-related effect might reasonably be assumed to be operating. Onset of the disorder should be directly related to the use of the psychoactive substance. Cases in which initial onset of the state occurs later than episode(s) of such substance use should be coded here only where clear and strong evidence is available to attribute the state to the residual effect of the psychoactive substance. Flashbacks may be distinguished from psychotic state partly by their episodic nature, frequently of very short duration, and by their duplication of previous alcohol- or other psychoactive substance-related experiences. Alcoholic dementia NOS Chronic alcoholic brain syndrome Dementia and other milder forms of persisting impairment of cognitive functions Flashbacks Late-onset psychoactive substance-induced psychotic disorder Posthallucinogen perception disorder Residual:affective disorder | disorder of personality and behaviour | Excl.: alcohol- or psychoactive substance-induced:Korsakov's syndrome (F10-F19 with common fourth character .6) | psychotic state (F10-F19 with common fourth character .5) | .8 Other mental and behavioural disorders .9 Unspecified mental and behavioural disorder | Acute drunkenness in alcoholism Bad trips (drugs) Drunkenness NOS Pathological intoxication Trance and possession disorders in psychoactive substance intoxication | Psychoactive substance abuse | Chronic alcoholism Dipsomania Drug addiction | Delirium tremens (alcohol-induced) | Alcoholic:hallucinosis | jealousy | paranoia | psychosis NOS | Amnestic disorder, alcohol- or drug-induced Korsakov's psychosis or syndrome, alcohol- or other psychoactive substance-induced or unspecified | Alcoholic dementia NOS Chronic alcoholic brain syndrome Dementia and other milder forms of persisting impairment of cognitive functions Flashbacks Late-onset psychoactive substance-induced psychotic disorder Posthallucinogen perception disorder Residual:affective disorder | disorder of personality and behaviour ...

Definition: A group of disorders characterized by an early onset (usually in the first five years of life), lack of persistence in activities that require cognitive involvement, and a tendency to move from one activity to another without completing any one, together with disorganized, ill-regulated, and excessive activity. Several other abnormalities may be associated. Hyperkinetic children are often reckless and impulsive, prone to accidents, and find themselves in disciplinary trouble because of unthinking breaches of rules rather than deliberate defiance. Their relationships with adults are often socially disinhibited, with a lack of ...[+++]normal caution and reserve. They are unpopular with other children and may become isolated. Impairment of cognitive functions is common, and specific delays in motor and language development are disproportionately frequent. Secondary complications include dissocial behaviour and low self-esteem.

Definition: A residual category for disorders in which there is some admixture of specific developmental disorders of speech and language, of scholastic skills, and of motor function, but in which none predominates sufficiently to constitute the prime diagnosis. This mixed category should be used only when there is a major overlap between each of these specific developmental disorders. The disorders are usually, but not always, associated with some degree of general impairment of cognitive functions. Thus, the category should be used when there are dysfunctions meeting the criteria for two or more of F80.-, F81.- and ...[+++] F82.

alteration in cognitive function

The impact of cannabis on cognition is well documented, short-term memory is adversely affected and chronic use may lead to chronic, measurable defects in cognitive functioning – though this may be the result of persistent chronic intoxication rather than impairment to the substance of the brain.

We also saw that the adverse effects of prolonged use on cognitive function are more prevalent in people who are already vulnerable because of their young age when they started using, for example, or their personal condition (for example, psychotic predispositions).

[59] In the United States, studies conducted in the 1970s found contradictory results for memory functions, whereas more recent studies reported subtle deficits in cognitive functions of heavy users after a brief period of abstinence.

The difficulty revolves around the definitions of mental functions necessary for everyday life and the distinctions made between some kinds of cognitive functions and others.