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I also agree with the theory that brain equals behavior. Data from fMRIs and PET scans is pretty convincing for me, but at the same time I think it is important to realize that these machines do not yet show “real time”. “Such images can be acquired with moderately good spatial and temporal resolution; images are usually taken every 1–4 seconds...(Wikipedia)”. Thinking about how quickly one can feel pain or think or react to any stimulus tells me that taking images every 1-4 seconds doesn’t give a very clear picture. So much more is most likely going on within the brain during those 1-4 seconds than the final image shows. Although the parts of the brain that were activated are still shown, they are not precise pictures.

The brain may be responsible for the chemical actions that physically cause behavior, but I think it is very short sighted to think that the brain causes all behavior. Environmental factors, upbringing, role models, culture and situation all influence behavior. The brain cannot stand alone as the reason for all behavior.