The behavioural approach cannot explain why some phobias are more common, as the biological preparedness theory suggests we are born with a predisposition to develop certain fears
The behavioural explanation has been criticised for being reductionist and overly simplistic, as it doesn't take into account the role of cognition in the formation of phobias
Assessed 65 pregnant women for cognitive vulnerability and depression before and after birth, found those with higher cognitive vulnerability were more likely to suffer post-natal depression
Depressed people undoubtedly have negative thoughts, but we can question do the negative thoughts help cause depression or are the negative thought merely as a result of being depressed