Abstract
Ivan Pavlov, the winner of the 1904 Nobel Prize, was born in Ryazan, Russia on September 14, 1849. His famous drooling dog experiment, which started in 1889, was the catalyst for his subsequent research in conditioning. This experiment had a significant impact on the emergence of physiologically focused behaviorist theories of psychology during the early 1900s.
His work on the physiology of the digestive glands won him the 1904 Nobel Prize in physiology or medicine.
Contributions
Pavlov's first independent work focused on the physiology of the circulation of the blood (Girogian, 1974). He studied the influence of variations in blood volume on blood pressure. He also investigated the nervous control of the heart, and argued that four types of nerves control rhythm and strength of cardiac contractions. It was during this first independent study that Pavlov used unanesthetized, neurologically intact dogs
...(Girogian, 1974).
The method of chronic experiment became the foundation of Pavlov's methodology and was central to his second independent work on digestion. Starting in 1879, digestion became his primary focus from 1890 to 1897 (Girogian, 1974). His work consisted of accumulated observations on the nervous control of one organ system through chronic experiment (Girogian, 1974).
The research on digestion included the creation of "fistulas" to gather secretions from salivary glands, stomach, pancreas, and small intestine (Girogian, 1974). Pavlov's approach was distinctive because he refrained from severing nerve supply or mixing secretions with food. Pavlov's most renowned experiment involved conditioning dogs to salivate upon hearing a bell. He initially measured the amount of salivation solely in response to food.
As the experiments continued, Pavlov rang a bell as he presented the food to the dogs (Girogian, 1974). Once
again, he observed a salivary response. In the end, Pavlov found that just by ringing the bell, the dogs would salivate in the same way as if they had been presented with food (Girogian, 1974). These experiments established what is known as a "conditioned response".
Classical Conditioning
Classical Conditioning refers to the type of learning that became well-known through Pavlov's dog experiments.
In an article called "An Animal Owners Guide to Operant and Classical Conditioning", Stacy Braslau explains the experiment conducted by Pavlov. Pavlov observed the salivary response of dogs when presented with food and also introduced the sound of a bell before serving the food. Initially, the dogs only started salivating upon food presentation.
After a period of time, though, the dogs started to produce saliva when they heard the bell. They learned to connect the sound of the bell with the arrival of food. In terms of their immediate physiological reactions, the sound of the bell became equal to the presentation of food. Ivan Pavlov's experiment with dogs and their response to stimulus established the foundation for Classical conditioning. The process of how classical conditioning operates can be explained in the following sequence (Mischel, 1993, p.
296):
- There is a natural response called a UCR (unconditioned response), which is like a reflex.
- There is a stimulus called the UCS (unconditioned stimulus) that triggers this response.
- Over time, the organism (such as a man or dog) will start associating the UCR with the UCS.
- Once the behavior is learned, the UCR may occur even when the UCS is simulated.
- The response at this point is referred to as conditioned (or CR - conditioned response).
The theory of Classical conditioning can explain various events in people's lives. For instance, how much a person likes another individual could be linked to how much the other person has come to represent positive stimuli or gratification (Mischel, 1993, p. 297). People may develop specific fears due to negative stimuli occurring simultaneously with another event (Mischel, 1993, p. 297). Freud's interpretation of little Hans, who developed a fear of horses after witnessing one fall and bleed, exemplifies phobia development through classical conditioning (Mischel, 1993, p.
In Watson's experiment, a boy was exposed to rats and a loud noise at the same time, resulting in his development of a strong aversion to rats and fuzzy things in general (Mischel, 1993, p. 299-300). The avoidance of certain situations by people can often be attributed to classical conditioning (Mischel, 1993, p. 302).
Classical conditioning has a profound impact on human nature, as individuals' associations with words and symbols stem from learned responses (Mischel, 1993, p. 304). For instance, the American national anthem, "The Star Spangled Banner," resonates emotionally within an American, whereas a Russian might not have the same reaction (Mischel, 1993, p. 304).
Acknowledgment of Experiment
The initial presentation of Pavlov's findings on how animals (including humans) can be trained to react in a specific way to
a particular stimulus sparked significant interest (Fredholm, 1999). This discovery paved the way for a new and more objective approach to studying behavior. Conditioned learning, also known as Pavlovian training, has found applications in various fields, including phobia treatment (Fredholm, 1999). It is important to note that a conditioned response established through repeated association between stimuli (such as dogs salivating at the sound of a bell) diminishes in intensity during extinction when the conditioned stimulus is presented without the unconditioned stimulus (food) (Fredholm, 1999). This phenomenon presents an opportunity for addressing phobias triggered by specific environmental situations like heights or crowds (Fredholm, 1999).
The patient is initially taught a technique for relaxing their muscles. Then, over a few days, they are instructed to imagine the situation that causes them fear while attempting to relax and prevent anxiety. By the end of the sessions, they should be able to think about the most anxiety-inducing situation without feeling anxious. This technique is called systematic desensitization (Fredholm, 1999). Conditioning plays a significant role in human learning, and it is now utilized in advertising as well (Fredholm, 1999).
An effective commercial seeks to manipulate the initial unemotional response to a stimulus, such as the mention of a product's name. Its aim is to establish a connection between positive emotions like happiness or feeling attractive with the particular brand being advertised.
Nobel Prize
Although Ivan Pavlov is commonly known for his experiments on drooling dogs, he was honored with the Nobel Prize in Physiology or Medicine in 1904 for his pioneering work on the digestive system's functionality.
Prior to Pavlov, the understanding of digestion in the stomach and its regulatory mechanisms was unclear. To gain
insight into this process, Pavlov developed a new monitoring method. He performed surgery on animals' stomachs, creating fistulas that allowed him to observe the organs and collect fluid samples while they were functioning normally (Fredholm, 1999).
Works Cited
- "Pavlov, Ivan Petrovich," Microsoft Encarta Online Encyclopedia 2001 http://encarta.msn.com 1997-2000 Microsoft Corporation.
- Mischel W. (1993). Behavioral conceptions. In W. Mischel, Introduction to Personality, 295-316.
New York: Harcourt Brace. Girogian, NA: Pavlov, Ivan Petrovich. In The Dictionary of Scientific Biography. Charles Schribners Sons, New York, Vol 10, pp. 431-6, 1974.
Fredholm, Lotta wrote an article titled "Ivan Pavlov" in the Science Journal on May 15, 1999.
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