2. Contiguity: This refers to two things or events happening close to each other so that the person is able to relate them to each other.

3. Contrast: It means that two events or ideas are completely opposing to each other, which results in the formation of a link between the two. Humans tend to associate the ideas together.

During this long history down to the middle of the 19th century, psychology was cultivated by able thinkers who did not realize their need of carefully observed facts and relied on information derived from the past experiences. And today psychology is nurturing every stream of life where it studies the human activities, in relation to its environment.

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