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ASTERIXIS

n. transient loss of a solid position for the hands or arms, followed by a jerking recovery movement. This phenomenon

ASYLUM

n. originally, these structures were designed as a refuge for criminals (from Greek asylon, sanctuary). From the 19th century onwards,

ATAVISM

n. 1. the presence of a genetic trait noted in a remote ancestor that did not continue to occur in

ATHYMIA

n. 1. the complete absence of feeling or emotion. 2. May also refer to the congenital absence of the thymus.

ATTACHMENT THEORY

a theory that (a) suggests an evolutionarily advantage, especially in primates, for the forming of close emotional bonds with significant

ATTENTION SPAN

1. the length of time an individual can sustain attention to one task. 2. the amount of material retained during

ATTENUATION

1. the lessening or weakening in strength, value, or quality of a stimulus or other factor, for example, a medication

ATYPICAL

differing from the norm in some manner - being unusual, unrepresentative, or uncharacteristic in some way.

ATYPICAL TIC DISORDER

in the DSM-lll, this represented a category of tic disorders. In the DSM-IV-TR these are labeled as tic disorders not

AUDIOMETRY

the measurement of an individual's hearing ability with electronic audiometers for the purposes of diagnosing and analyzing hearing loss. Audiometry

AUDITORY DISTANCE PERCEPTION

the ability to assess the distance of the source of a sound, based solely on acoustic information. Humans are fairly

AUDITORY PROCESSING

refers to the group of processes or mechanisms that underlie hearing.

AUGURY

refers to the divination of future events on the basis of omens, or other signs. In ancient Rome, an augur

AUTHORITY

n. the capacity to influence others either directly or indirectly. Formal authority, for example, enables an individual to exert influence

AUTOCHTHONOUS GESTALT

a perceptual pattern that is created by internal factors (autochthonous forces) rather than factors of the external stimulus, or the

AUTOKINESIS

n. 1. refers to any type of voluntary movement. 2. an illusory perception of movement, for example, that experienced by

AUTOMATIC PROMOTION

1. advancing a student who has not sufficiently gained the academic skills and knowledge of one grade level to a

AUTONEPROPHILIA

n. a specific type of sexual pleasure derived from dressing as a baby, pretending to be a baby, or having

AUTONOMOUS

1. having a completely independent existence. 2. having the abilities for self-government. 3. acting or operating under one