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Delirium (formerly acute confusional state, an ambiguous term that is now discouraged) [1] is a specific state of acute confusion attributable to the direct physiological consequence of a medical condition, effects of a psychoactive substance, or multiple causes, which usually develops over the course of hours to days.
In Psychology, confusion is the quality or emotional state of being bewildered or unclear. The term "acute mental confusion" [ 1 ] is often used interchangeably with delirium [ 2 ] in the International Statistical Classification of Diseases and Related Health Problems and the Medical Subject Headings publications to describe the pathology .
Confusion matrix is not limited to binary classification and can be used in multi-class classifiers as well. The confusion matrices discussed above have only two conditions: positive and negative. For example, the table below summarizes communication of a whistled language between two speakers, with zero values omitted for clarity. [20]
The psychological literature has distinguished between several different forms of ambivalence. [4] One, often called subjective ambivalence or felt ambivalence, represents the psychological experience of conflict (affective manifestation), mixed feelings, mixed reactions (cognitive manifestation), and indecision (behavioral manifestation) in the evaluation of some object.
Positive valence to surprise is shown through a dilation or expansion of the pupil, where as negative valence in surprise is associated with pupil constriction. [15] But, newer studies show pupil dilation for negative as well as positive stimuli, indicating a general autonomous arousal associated with pupil dilation and not affective valence.
This glossary covers terms found in the psychiatric literature; the word origins are primarily Greek, but there are also Latin, French, German, and English terms. Many of these terms refer to expressions dating from the early days of psychiatry in Europe; some are deprecated, and thus are of historic interest.
In a classification task, the precision for a class is the number of true positives (i.e. the number of items correctly labelled as belonging to the positive class) divided by the total number of elements labelled as belonging to the positive class (i.e. the sum of true positives and false positives, which are items incorrectly labelled as belonging to the class).
The use of such terms and phrases helps avoid possible ambiguity and confusion. For instance, when reading the phrase "x is positive", it is not immediately clear whether x = 0 is possible, since some authors might use the term positive loosely to mean that x is not less than zero.