Contiguity theory or law of contiguity and one trial learning were introduced in 1920s by American philosopher, mathematician and psychologist Edwin Guthrie. Law of contiguity states that a close temporal relationship between a stimulus and a response is the only necessary condition for an association between the two to be established.

Guthrie attempted to explain learning through association of stimuli with responses. Learning, in terms of behavior is a function of the environment. According to Guthrie, learning is associating a particular stimulus with a particular response. This association, however, will only occur if stimuli and responses occur soon enough one after another (the contiguity law). The association is established on the first experienced instance of the stimulus (one trial learning). Repetitions or reinforcements in terms of reward or punishment do not influence the strength of this connection. Still, every stimulus is a bit different, which results in many trials in order to form a general response. This was according to Guthrie the only type of learning.

Learned behaviors are composed of a series of movements, where each movement is a small stimulus-response combination. This movements are actually what is being learned in each one trial learning rather than behaviors. Learning a number of moves forms an act (incremental learning). Unsuccessful acts remain not learned because they are replaced by later successfully learned acts. Other researchers like Watson studied whole acts just because it was easier, but movements are what should actually be studied.

Forgetting occurs not due to time passage, but due to interference. As time passes, stimulus can become associated with new responses. Three different methods can help in forgetting an undesirable old habit and help replacing it:

• Fatigue method - using numerous repetitions, an animal becomes so fatigued that it is unable to reproduce the old response, and introduces a new response (or simply doesn't react).
• Threshold method - first, a very mild version of the stimulus below the threshold level is introduced. Its intensity is then slowly increased until the full stimulus can be tolerated without causing the undesirable response
• Incompatible stimuli method - the response is “unlearned” by placing the animal in a situation where it cannot exhibit the undesirable response.

Although it was intended to be a general theory of learning, Gurthie's theory was tested mostly on animals.

In Guthrie's own words, “we learn only what we ourselves do”¹⁾. Learning must be active, but as such must involve both teacher's and students' activity in order to relate stimulus with a response within a time limit. Guthrie also applied his ideas to treatment of personality disorders.

Guthrie's theory was first preferred, due to its simplicity, but later criticized for the same reason. Its simplicity was later turned into incompleteness. It was also based on too little experimental data.

• contiguity theory, one trial learning, movement, forgetting
• Edwin Guthrie

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