Pavlov's Explain The Three Stages Of Classical Conditioning

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John Watson proposed that the process of classical conditioning (based on
Pavlov’s observations) was able to explain all aspects of human psychology.
Everything from speech to emotional responses were simply patterns of stimulus and response.
The basic concepts
Behaviorism: emphasize the role of environmental factors in influencing behavior, to the near exclusion of innate of inherited factors. This amounts essentially to a focus on learning. We learn new behavior through classical or operant conditioning.

There are three stages of classical conditioning. At each stage the stimuli and responses are given special scientific terms:
• Stage 1: Before Conditioning:
In this stage, the unconditioned stimulus (UCS) produces an unconditioned response (UCR) in an organism. In basic terms, this means that a stimulus in the environment has produced a behavior response which is unlearned (i.e. unconditioned) and therefore is a natural response which has not been taught. In this respect no new behavior has been learned yet.
This stage also involves another stimulus which has no effect on a person and is called the neutral stimulus (NS). The NS could be a person, object, place, etc. The neutral stimulus in classical conditioning does not produce a response until it is paired with the unconditioned stimulus.
For example: a perfume (UCS) could create a response of happiness or desire (UCR).
• Stage 2: During Conditioning:
During this stage a stimulus which produces no response (i.e.

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