Neuroscientist J. Allan Hobson has hypothesized as to what might be occurring in the brain while lucid. The first step to lucid dreaming is recognizing that one is dreaming. This recognition might occur in the dorsolateral prefrontal cortex which is one of the few areas deactivated during REM sleep, and where working memory occurs. Once this area is activated and the recognition of dreaming occurs the dreamer must be cautious to let the dream delusions continue, but be conscious enough to recognize them. This process might be seen as the balance between reason and emotion. While maintaining this balance the amygdala and parahippocampal cortex might be less intensely activated.[8] To continue the intensity of the dream hallucinations it is expected the pons and the parieto-occipital junction cortex stay active. To verify this hypothesis it would be necessary to observe the brain during lucid dreaming using a method such as a PET scan, which captures a snapshot of the blood flow to the brain. No such experiment has yet been performed.[9]