What did Michal Posner find when he conducted PET scans of people reading a word and associating it with a function

Localized activity occurred, but the location varied widely. Similar localized activity was seen in all the participants.

Explanation:

According to the "anatomy of attention", scientists who studied the links between the behavior & the brain of an individual finds that attention is considered as a general activity of an individual's brain, yet it doesn't entail a "general improvement" in every system associated with the brain that is being involved in "stimulus processing".

The study directed by Michael Posner i.e., based on PET or Positron Emission Tomography that involves normal individuals responding to different stimuli and the study examined two important centers of "attention functions", including "Right frontal cortex" & "Posterior parietal lobe of the cortex".

-"Right frontal cortex" responsible for maintaining alertness.

-"Posterior parietal lobe of the cortex" responsible for orienting "visual attention".

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the answer is:

c. economic output