Word: buzzers
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...light was a signal that work would go unrewarded. Thus, the dogs immediately ceased pressing the lever when the light went on. Next came another 15-minute period of constant response from the dog, provoked by the arbitrary reward schedule. Following this was five minutes during which a buzzer sounded. The dogs would be fed as before if they continued to work. The dogs were not initially frightened by the buzzer, and worked while it operated. Later during the last five seconds of the buzzing, however, an extremely loud horn was turned on. Not one dog worked during the horn...
...subsequent work periods, the majority of the dogs did not work during the buzzer, which, by association with the horn, had become a learned fear stimulus...
...such a procedure, Lindsley had produced highly stabilized and regular behavior in the dogs, and had conditioned the animals' behavior to certain factors--when the light was on, the dogs would remain idle, when the buzzer sounded, the animals refused to work. With such stability and consistent performance, any changes in the dogs' behavior due to radiation could be observed...
...long noisy seconds Saturday night in the Block-house, Yale's Jim Places stood a little past the foul circle with a basketball. Then, with two seconds left, teammate Spence Schnaitter ran over and tapped him. Places awakened, shot the ball, the buzzer went off, the ball went through the hoop. The Elis went wild, and everyone else just stood there...
...final warning buzzer sounded, indicating a half hour to go until lock-up time. Bradley began walking toward the locker room, unfastening the broad black belt across his padded stomach...