Who illucidates the contiguity theory of rein­forcement in the most pronounced and con­sistent manner?

The contiguity theory of reinforcement is most prominently and consistently elucidated by Edwin R. Guthrie. Here is a step-by-step explanation:

1. Introduction to Contiguity Theory:

   • Contiguity theory is a learning theory that emphasizes the importance of the temporal association between stimuli and responses. It suggests that learning occurs when a stimulus and response occur close together in time.

2. Key Proponent:

   • Edwin R. Guthrie is the psychologist most closely associated with contiguity theory. He proposed that all learning is based on a simple principle: a combination of stimuli which has accompanied a movement will, on its recurrence, tend to be followed by that movement.

3. Core Principles:

   • Temporal Proximity: Guthrie argued that for learning to occur, the stimulus and response must occur close together in time.
   • One-Trial Learning: He believed that learning happens in a single trial, meaning that once a stimulus-response connection is made, it is learned.
   • Reinforcement: Unlike other theories that emphasize reinforcement (like rewards or punishments) as necessary for learning, Guthrie's theory suggests that the mere contiguity of stimulus and response is sufficient.

4. Guthrie's Experiments:

   • Guthrie conducted various experiments to support his theory. One famous experiment involved cats in a puzzle box, where he demonstrated that the cats learned to escape based on the specific movements they made in response to the stimuli present.

5. Comparison with Other Theories:

   • Guthrie's contiguity theory contrasts with other learning theories, such as Thorndike's Law of Effect and Skinner's Operant Conditioning, which emphasize the role of reinforcement in learning.

6. Implications and Applications:

   • Guthrie's theory has implications for understanding habit formation and breaking. It suggests that to change a habit, one must change the stimuli associated with the undesired response.

In summary, Edwin R. Guthrie is the psychologist who most clearly and consistently elucidates the contiguity theory of reinforcement, emphasizing the importance of temporal association between stimuli and responses in the learning process.