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ANDROGYNISM

a descriptive term that denotes the presence of male and female sex characteristics in the same individual. See also hermaphrodite,.

ANEURYSM (ANEURISM)

n. swelling at a specific point in an artery, usually where arteries branch from each other, caused by the impact

ANHEDONIA

n. an overall lack of pleasure in previously enjoyed activities. Common to both schizophrenia and depression, it forms one of

ANIMAL EMOTIONALITY

hypothesized emotional reactions in animals, as measured by heart rate, hormonal changes, and defecation rate. Correlations exist showing that the

ANIMAL SOCIAL BEHAVIOR

the aggregate of all behaviors that include interaction with other group members or animals. These behaviors include cooperation, play, aggression,

ANISOMETROPIA

n. a condition whereby the refractory powers of the eyes are unequal in the same individual.

ANOETIC MEMORY

the most basic and fundamental of memory in Endel Tulving's monohierarchic theory of memory. Refers to any type of learning

ANOREXIA

1. the deliberate restriction of caloric intake due to a reduced appetite - often thought to be part of a

ANTAGONIST

n. 1. An agent, for example a drug or hormone, that works to reduce the action of an agonist -

ANTEROLATERAL SYSTEM

one of the major somatosensory system comprising of ascending in the anterior lateral white matter of the spinal cord. Originating

ANTICATHEXIS

n. a process described in psychoanalytic theory, whereby the ego withdraws psychic energy from some unconscious desires, then strengthens other

ANTICIPATORY REGRET

feeling the negative consequences of a decision prior to the choice made: For example, an individual may decide not to

ANTIMETROPIA

a condition in which one individual has an eye that is myopic (nearsighted) with the other eye being hyperopic (farsighted).

ANTITHESIS

1. an idea, or proposition that is opposite to or contradicts another proposition or idea. 2. in philosophy, this term

ANXIETY NIGHTMARE

a frightening dream that is sometimes thought to represent the innermost fears of the dreamer.

APASTIA

n. refers to fasting or complete abstinence from food. Compare aphagia.

APLYSIA

u. types of mollusks that have an incredibly simple nervous system and are often used to study neurophysiology - especially

APPARATUS

n. 1. an instrument, piece of equipment, used in an experiment for various purposes, such as delivering stimuli or measuring

APPETITIVE BEHAVIOR I

an active searching process, performed consciously, that precedes consummatory behavior (see consummaiory response). It is thought to be indicative of

APPREHENSION

n. anxious expectation, worry, general uneasiness, or dread about a situation, event, or the future in general.