APA Division refers to the subdivision of the American Psychological Association that focuses on (1) understanding the etiology and promotion and maintenance of health ; (2) preventing, diagnosing, treating, and rehabilitating physical and mental illness ; (3) studying psychological, social, emotional, and behavioral factors in physical and mental illness; and (4) improving the health care system and formulation of health policy.

APA Ethics Code refers to a common set of principles and standards on which psychologists build their professional and scientific work. This Code is intended to provide specific standards that cover most situations encountered by psychologists. Its primary goal is the welfare and protection of the individuals and groups with whom psychologists work.

APA format refers to the journal article format specified by the American Psychological Association (APA).

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Deutsch: Apathie / Español: Apatía / Português: Apatia / Français: Apathie / Italiano: Apatia

In psychology, apathy refers to a lack of interest, enthusiasm, or concern. It is characterized by diminished motivation or a lack of feeling towards activities that typically might excite the individual, often impacting their daily functioning.

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Deutsch: Apertur / Español: Apertura / Português: Abertura / Français: Ouverture / Italiano: Apertura

In psychology, the term Aperture refers to the cognitive or perceptual mechanism that determines the scope and focus of attention, influencing how individuals process and interpret sensory and conceptual information. Unlike its optical counterpart in physics, psychological aperture governs the selective filtering of stimuli, shaping decision-making, memory encoding, and behavioral responses. Its study intersects with fields such as cognitive psychology, neuroscience, and human-computer interaction, where understanding attentional constraints is critical.

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Aperture problem refers to a situation in which only a portion of a moving stimulus can be seen, as when the stimulus is viewed through a narrow aperture. This results in misleading information about the direction in which the stimulus is moving.

Apex of the cochlea refers to the end of the basilar membrane farthest from the middle ear.

Apgar refers to the system developed by Virginia Apgar, M.D., that assesses the general physical condition of a newborn infant for five (5) criteria: (A) activity/muscle tone (P) pulse rate (G) grimace and reflex irritability (A) appearance/skin color (R) respiration