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- Ability
- Present performance level of skill or knowledge, apposed to aptitude or capacity
- Absolute threshold
- Minimum stimulus level at which a given response will occur
- Accommodation
- Change of the eye's lens to adjust to an objects distance
- Acetylcholine
- Released by motor nerve axon terminals and at certain automatic nervous system effector terminals
- Achievement
- Abilities in a certain field
- Action
- Unified sequence of behavior
- Acuity
- Ability to discriminate small stimulus differences
- Adaption
- Sensitivity change after continued stimulation
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