Classical Conditioning in practice; By Ebony Teesdale Classical conditioning was fist described by physiologist Ivan Pavlov. It is a form of learning that occurs through the repeated association of two or more different stimuli. Classical conditioning is used in a number of different settings, most have therapeutic benefits. When people develop behaviours that are harmful to themselves or others, aversion therapy is used to eradicate these behaviours. Aversion therapy is a form of behaviour therapy that applies classical conditioning principles to block or discourage undesirable behaviour. They associate undesirable behaviour with an unpleasant stimulus such as a feeling of disgust, pain or nausea. The aim of aversion therapy is to suppress or weaken the undesirable behaviour. One of the limitations in aversion therapy is that the learned aversion often fails to generalise situations other than those under which learning took place. Systematic desensitisation is a kind of behaviour therapy that attempts to replace an anxiety or fear response with a relaxation response through a classical conditioning procedure. The process requires the client to associate being relaxed with the fear- arousing stimulus through a series of graded steps. The steps of desensitisation are the client is taught to relax. The second phase of treatment is to break down the fear-arousing situation into a logical sequence. The basic principle is that the client is gradually desensitised to anxiety or fear-arousing objects, activities or situations. In psychological experiments an ethics code is put in place to protect the rights of the participants. In classical conditioning any ethical issues demand attention.