The study by Paul L. Brown and Herbert M. Jenkins explores the auto-shaping of the pigeon's key-peck response through different conditioning arrangements. The key-peck response was reliably acquired through repeated unconditional pairings of a key-light stimulus with food delivery. The study compared three types of superstitious conditioning: (1) unconditional reinforcement, (2) reinforcement conditional on behavior but unconditional on stimuli, and (3) reinforcement conditional on stimuli but unconditional on responses. In the first type, where reinforcement was entirely unconditional, the pigeon's key-peck was acquired through repeated pairings of the key-light with food. The results showed that the key-peck emerged as a stereotyped movement pattern, indicating a form of superstitious conditioning. In the second type, where reinforcement was conditional on behavior but unconditional on stimuli, the key-peck was reinforced at variable intervals. However, the key-peck was not consistently acquired, and some birds showed a reversal in their pecking rate over time. In the third type, where reinforcement was conditional on the stimulus but unconditional on responses, the key-peck was conditioned through repeated pairings of the key-light with food. The study found that the key-peck emerged as a result of this conditioning process, and the results showed that the key-peck was more likely to occur when the key-light was paired with food. The study also examined the effects of different stimulus conditions on the acquisition of the key-peck. The results showed that the key-peck was more likely to occur when the key-light was paired with food, and that the use of a constantly lighted key with intermittent food presentations was more effective than using a momentary illumination of the key in conjunction with tray operations. The study concluded that the key-peck was a result of a conditioning process, and that the use of a key-light as a stimulus was a critical feature in the acquisition of the key-peck. The study also suggested that classical conditioning might play a role in the emergence of the key-peck, although this was not definitively established. The study found that the key-peck could be reliably acquired through the repeated pairing of the key-light with food, and that this procedure was efficient and effective for training pigeons to peck at a key.The study by Paul L. Brown and Herbert M. Jenkins explores the auto-shaping of the pigeon's key-peck response through different conditioning arrangements. The key-peck response was reliably acquired through repeated unconditional pairings of a key-light stimulus with food delivery. The study compared three types of superstitious conditioning: (1) unconditional reinforcement, (2) reinforcement conditional on behavior but unconditional on stimuli, and (3) reinforcement conditional on stimuli but unconditional on responses. In the first type, where reinforcement was entirely unconditional, the pigeon's key-peck was acquired through repeated pairings of the key-light with food. The results showed that the key-peck emerged as a stereotyped movement pattern, indicating a form of superstitious conditioning. In the second type, where reinforcement was conditional on behavior but unconditional on stimuli, the key-peck was reinforced at variable intervals. However, the key-peck was not consistently acquired, and some birds showed a reversal in their pecking rate over time. In the third type, where reinforcement was conditional on the stimulus but unconditional on responses, the key-peck was conditioned through repeated pairings of the key-light with food. The study found that the key-peck emerged as a result of this conditioning process, and the results showed that the key-peck was more likely to occur when the key-light was paired with food. The study also examined the effects of different stimulus conditions on the acquisition of the key-peck. The results showed that the key-peck was more likely to occur when the key-light was paired with food, and that the use of a constantly lighted key with intermittent food presentations was more effective than using a momentary illumination of the key in conjunction with tray operations. The study concluded that the key-peck was a result of a conditioning process, and that the use of a key-light as a stimulus was a critical feature in the acquisition of the key-peck. The study also suggested that classical conditioning might play a role in the emergence of the key-peck, although this was not definitively established. The study found that the key-peck could be reliably acquired through the repeated pairing of the key-light with food, and that this procedure was efficient and effective for training pigeons to peck at a key.