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Pennsylvania Railroad

(Encyclopedia)Pennsylvania Railroad, former U.S. transportation company; inc. 1846 by the Pennsylvania legislature. It opened in 1854 as a single-track line between Philadelphia and Pittsburgh. Beginning in 1857, t...

Montgomery, city, United States

(Encyclopedia)Montgomery, city (1990 pop. 187,106), state capital and seat of Montgomery co., E central Ala., near the head of navigation on the Alabama River just below the confluence of the Coosa and Tallapoosa r...

behavior therapy

(Encyclopedia)behavior therapy or behavior modification, in psychology, treatment of human behavioral disorders through the reinforcement of acceptable behavior and suppression of undesirable behavior. The techniqu...

learning

(Encyclopedia)learning, in psychology, the process by which a relatively lasting change in potential behavior occurs as a result of practice or experience. Learning is distinguished from behavioral changes arising ...

chinook, warm, dry air mass

(Encyclopedia)chinook, warm, dry air mass that descends the eastern slopes of the U.S. and Canadian Rocky Mts. after having lost moisture by condensation over the western slopes. Chinooks occur mainly in winter. Th...

United States Air Force Academy

(Encyclopedia)United States Air Force Academy, at Colorado Springs, Colo.; for training young men and women to be officers in the U.S. air force; authorized in 1954 by Congress. Temporary quarters were opened at th...

Wright-Patterson Air Force Base

(Encyclopedia)Wright-Patterson Air Force Base, U.S. military installation, 8,023 acres (3,247 hectares), W Ohio, NE of Dayton; est. 1917. One of the largest airport installations in the world, it is the air force's...

Melankomas of Caria

(Encyclopedia)Melankomas of Caria, d. c. a.d. 70, ancient Greek boxer. Known for his exceptional beauty, conditioning, and endurance, he is said to have always held his arms up high in defense, thus protecting his ...

association

(Encyclopedia)association, in psychology, a connection between different sensations, feelings, or ideas by virtue of their previous occurrence together in experience. The concept of association entered contemporary...

behaviorism

(Encyclopedia)behaviorism, school of psychology which seeks to explain animal and human behavior entirely in terms of observable and measurable responses to environmental stimuli. Behaviorism was introduced (1913) ...