Operant Conditioning

Question 1

Schedules of Reinforcement

Answer 1

Fixed interval - a reward after a fixed amount of time
Variable interval - a reward after a varying amount of time
Fixed ratio - a reward occurs after a behavior is repeated x number of times
Variable ratio - a reward occurs after a random number of responses
Random - no pattern
Variable ratio schedules are most resistant to extinction (gambling works in this way).

Question 2

Shaping and chaining

Answer 2

Sometimes an exact behaviour cannot be performed and so cannot be rewarded. In this instance it is helpful to reward successive, increasingly accurate approximations to the behaviour. This is called shaping.

Chaining involves breaking a complex task into smaller more manageable sections.

Shaping and chaining are similar but different in two main ways:

Shaping always moves forward. Where as it is quite possible to move backward with backward chaining

Another difference involves when reinforcers are delivered. In shaping, each new approximation is reinforced. In chaining, reinforcers are usually provided at the end of the chain.

Question 3

Escape conditioning

Answer 3

This actually involves both classical and operant conditioning.

Escape conditioning refers to a situation whereby an aversive situation is removed after a response. It is a form of negative reinforcement. For example, imagine a rat stood on a raised platform in a pool of water. When an electrical current is applied to the plat from the rat will jump into the water to stop the unpleasant sensation of the electric shock (the shock is removed following the response).

Question 4

Avoidance conditioning

Answer 4

When a person learns to respond to a signal in a way that avoids an aversive stimulus before it arrives this is avoidance conditioning. For example, imagine that in the above example, a buzzer sounded just before the electric shock was applied. Eventually the rats would learn to jump off the platform at the sound of the buzzer rather than wait for the shock.

Question 5

Habituation

Answer 5

Habituation refers to the phenomenon whereby a there is a decrease in response to a stimulus over time (overtime you pay less attention to repeated sounds in your environment). If the stimulus is removed for a period of time and then reintroduced then the response will reappear at full strength. This is referred to as spontaneous recovery.

Question 6

Covert sensitisation

Answer 6

This is a technique used whereby someone learns to use mental imagery (hence it’s covert) to associate a behaviour with a negative consequence.

For example, a person may be encouraged to use imagery to link smoking a cigarette with the development of lung cancer.
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