In the early part of the 20th century, there was a long time that cognitive neuropsychology was not studied. This was partly because of the influence of John B. Watson, who was a behaviorist in psychology. He argued that cognition could not be studied scientifically because it could not be observed. So for the first half of the 20th century, psychology as a field was dominated by behaviorism, which was mainly stimuli and a person’s response to it. John B. Watson was only one psychologist to criticize cognitive psychology. Pierre Marie in 1906 criticized Broca, who was one of the first to create the field of Cognitive Neuropsychology. Henry Head in 1926 also attacked the whole field of cognitive neuropsychology. Due to these criticisms, and the influence of behaviorism, cognitive neuropsychology was dormant for many years.