Classical

& Operant Conditioni Essay, Research Paper

A COMPARISON BETWEEN CLASSICAL AND OPERANT CONDITIONING.

This essay outlines the basic principles of classical and operant conditioning and considers the similarities and differences between these two models of learning.

CLASSICAL CONDITIONING

Classical conditioning is so named after the experimental procedure devised by the physiologist, Ivan Pavlov (1849-1936), when he changed his focus from the digestive system to conditioning, after noticing a dog salivate when it saw the bucket in which its food was kept.

Pavlov devised an instrument to measure the salivation of the dog when giving it meat powder. The meat powder was the unconditioned stimulus (UCS) and the response was salivation, an unconditioned response (UCR). Unconditioned means that the response is automatic, based on instinct. He then rang a bell, the neutral stimulus, and directly afterwards gave some meat powder (UCS) to the dog. The dog responded by salivating. Pavlov repeated this several times a day for 1 week and discovered that if he rang the bell but did not give the dog meat powder it still salivated. He now saw the bell as a conditioned stimulus (CS), and the salivation as a conditioned response (CR), as it had been learned.

If a neutral stimulus that does not produce a response is repeatedly paired with a UCS that does produce a response, then the neutral stimulus will become a CS and also produce a response.

An everyday example of this would be a person leaving a building upon hearing the fire alarm. The UCS is fear of a fire, the CS is the alarm s ring, and the CR is leaving the building.

Principles to Classical Conditioning

+ Stimulus Generalisation – this refers to using similar stimuli to the CS, a bell with a slightly higher ringing tone to the original one, for example, that will probably evoke the salivary response. The more different the stimuli, the weaker the CR will be.

+ Stimulus Discrimination – this refers to the ability to evoke a response to a CS, but not to other similar but different stimulus. Pavlov paired a black ellipse with the meat powder, combining this with the bell and once the black ellipse had produced a CR he paired the UCS (meat powder) with a similar shape and not with the ellipse. The new shape, a black circle, was repeatedly paired with the meat powder until it produced a CR. The dog was able to discriminate between the shapes.

+ Higher Order Conditioning – Pavlov did another experiment where he paired a metronome (CS) with the meat powder (UCS). After evoking a CR to the CS he paired it with a black square (neutral stimulus) but no UCS. After a while the square evoked a CR even though it had never been paired with the UCS.

+ Extinction this occurs when the CS loses its ability to produce a CR. Pavlov produced the CS but did not reinforce it using the UCS. After repeating this several times the dog did not salivate. Also, if the CS is used again after a time-lapse, the CR may return but in a weaker form. This is known as spontaneous recovery.

Applications of Classical Conditioning

Classical conditioning is used to treat people with phobias, using various methods. Firstly there is systematic desensitisation . In the case of arachnophobia, the person would be shown the mildest image of a spider, eg a cartoon drawing, and then asked how they felt. The image of the spider would then be gradually intensified, making it more realistic, in each case followed with an assessment of the person s reaction. This process is known as hierarchy of stimulus intensity . Reciprocal inhibition speeds this process up by getting the person to relax more (by using hypnotherapy, for example). Also there is flooding where the person is forced to confront the phobia in its most extreme form for as long as they can bear it. This is the most effective technique, but generally less extreme techniques are favoured.

Another use is Aversion Therapy , which tackles addiction. Administering an emetic drug, which would make them vomit whenever they imbibed alcohol, would treat an alcoholic.

OPERANT CONDITIONING

Operant conditioning amounts to learning that a particular behaviour leads to attaining a particular goal. (Rescorla 1987)

Operant conditioning started with some experiments by E.L Thorndike (1911) who built a puzzle box in which he put a hungry cat. (see figure 2)

Figure 2 – Thorndike s puzzle box

The door of the box was held shut with a spring on a pulley with a loop on the end. If the cat pulled the loop the door would open. The cat could see and smell the fish and reacted by meowing, prowling around the box and various other responses until eventually it pulled the loop to open the door, thus escaping to eat the fish. Thorndike called this response a pleasant consequence . He put the cat back in the box and saw that the cat would arrive at the pleasant consequence a bit quicker than before. Based on this experiment he formulated The Law of Effect which states, If the response to a stimulus is followed by pleasant consequences it becomes stamped in to the organism and is more likely to occur to the stimulus in the future. An example of this would be giving a biscuit to a child for picking up all of its toys. If it does not have pleasant consequences then it will become

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