Adrian, a neurologist, is examining the brain activity of children with attention deficit hyperactivity disorder. he observes images of their brains while they are performing a reading task and then again when they are not engaged in the activity. he compares these readings. although he establishes a relationship between the two variables, he is not able to establish that one variable causes the other. what brain imaging technique is he most likely to have used for his study?

The neurologist most likely used the functional magnetic resonance imaging

Explanation:

Functional magnetic resonance imaging, abbreviated as fMRI, is used for monitoring and measuring the brain activity by detecting the changes in the blood flow. This imaging technique is based on the principle that when a particular area or region of the brain is being used, the blood flow to that area or region increases.  

Therefore, the neurologist most likely used the functional magnetic resonance imaging.