Extinction of response:

 In psychology, extinction refers to the gradual weakening of a conditioned response that results in the behavior decreasing or disappearing. In other words, the conditioned behavior eventually stops. 

Cause of extinction:

In classical conditioning, when a conditioned stimulus is presented alone without an unconditioned stimulus, the conditioned response will eventually cease.

In operant conditioning, extinction occurs when a response is no longer reinforced following a discriminative stimulus.

• Continuous reinforcement: Continuous reinforcement is a method of reinforcing behavior in an effort to increase or decrease a particular behavior's frequency. It is part of a method of learning known as operant conditioning. In continuous schedules, reinforcement is provided every single time after the desired behavior. We have come to expect our behavior to be reinforced every time it is performed and quickly grow discouraged if it is not.
• Partial reinforcement: Unlike continuous schedules, partial schedules only reinforce the desired behavior occasionally rather than all the time. This leads to slower learning since it is initially more difficult to make the association between behavior and reinforcement. However, partial schedules also produce behavior that is more resistant to extinction.