Cognitive neuropsychology
Another reason why cognitive neuropsychology disappeared in the early twentieth century was because the science was not yet advanced enough. Many cognitive psychologists were also neurologists. These two fields of study were not separate yet, as they are today. These neurologists wanted to study modules in the brain, and localize them with parts of the brain, but technology did not allow this yet. The methods used today were not yet created. They could only study where a person’s brain lesion was by doing an autopsy after the person was already dead. This was a lot of the reason this field was criticized against, and why many people believed cognition could not be studied scientifically.