Classical conditioning doesn’t explain how phobias decay over time.
Mowrer claims that most phobias are long term and are maintained through operant conditioning
Operant conditioning explains that phobias can be negatively reinforced, by people avoiding their phobias.
Avoiding your phobias reduces anxiety, and therefore negatively reinforces their behaviour, making you more likely to repeat the behaviour and maintain the phobia.
According to the two process model, phobias are initiated through classical conditioning and maintained through operant conditioning