Examlex
Most historians agree that after Thomas Jefferson and until the beginning of the twentieth century, Jackson and Lincoln were the exceptions to a succession of weak presidents.
Limbic System
A complex system of nerves and networks in the brain, involved with instinct and mood. It controls basic emotions and drives, such as fear, pleasure, and anger.
Reinforcement
In behaviorist psychology, any event that strengthens or increases the likelihood of a behavior by providing a consequence an individual finds rewarding.
Behavior
Actions or reactions of individuals or groups in response to external or internal stimuli.
Single-blind Study
A study or experiment in which the participants do not know which group or condition they have been assigned to, but the researchers do.
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