The negative aspects of the behavioural perspective are that it is normally based on work with non-human animals. This can be ineffective because, humans are unique and cannot be associated to animals as it is ethical. An example of an animal study was by Pavlov 1927. The dogs that Pavlov was observing started to produce saliva when they saw white lab assistants bringing out food directly to them. Pavlov knew that saliva is a reflex and he knew that the dogs would still salivate even though the lab assistants had no food on them. Pavlov would then experiment by ringing a bell when the food was brought out to them. This shows the dogs have learnt this by association. The dogs would still produce saliva when they heard the ringing of the bell
