Cerebral oxygen delivery and consumption during evoked neural activity.

Here is an article that points out differing levels of oxygen consumption by the brain with no further data as of yet to understand what the changes mean. What experience or thought process would require an increase in oxygen consumption?

I would think that during a post traumatic stress disorder episode, more oxygen would be consumed as more ATP is used by the nerves throughout the body leaving the experiencer feeling spent and drained until the body could replenish its reserves.

I am looking forward to seeing what happens next with this research.