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Absolute Threshold
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The minimum Stimulation needed to detect a particular stimulus 50% of the time
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Accommodation
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Adapting ones current understanding (schemas) to incorporate new information
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Accommodation
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The process by which the eyes lens changes shape to focus near or far objects on the retina
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Acetylcholine
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A neurotransmitter that enables learning, memory and triggers muscle contraction.
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Achievement Motivation
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A desire for significant accomplishment for mastery of things, people, or ideas attaining a high standard
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Acheivement Test
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A test designed to assess what a person has learned
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Acoustic Encoding
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The encoding of sound.
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Aquisition
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The initial stage in classical conditioning; the phase associating a neutral stimulus with a unconditioned stimulus so that neutral stimulus comes to elicit a conditioned response. In operant conditioning, the strenghthening of a reinforced response
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Action Potential
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A neural impulse; a brief electrical charge that travels down the axon. The action potential is generated by movement of positively charged atoms in and out of channels in the axons membrane.
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Active Listening
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Emphathic listening in which the listener echoes, restates, and clarifies. A feature of roberts client centered therapy.
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Acuity
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The Sharpness of Vision
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Adaptation-level phenomenon
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Our tendency to form judgments of sounds, lights,income relative to a neutral level defined by our prior experience
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Addiction
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Compulsive drug craving and use.
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Adolescence
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The transistion period from childhood to adulthood extending from puberty to independence.
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Adrenal Glands
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A pair of endocrine glands just above the kidneys. The adrenal glands secrete the hormones epinephrine (adrenalin) and norephinephrine (noradrenalin) which help the body arouse in time of stress.
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