Wolf wants to read more about brain-mapping technology. He would find most of the information on a Web site about science under the heading .

advanced neuroscience

Explanation:

The brain imaging technique helps you to imagine within the brain and more specifically recognise the abnormal brainwave activity that trigger neurological disorders. The brain map produces a chart for each participant that indicates the places of impairment as well as the interventions prescribed to resolve them.

This is studies under the advanced neuroscience subject. Neuroscientists concentrate on the brain and its effect on actions through cognitive function, including how individuals  think about it. They are now studying what occurs to the central nervous whenever individuals with neurological, psychological, as well as neurodevelopmental conditions.

the purpose of the heading in the passage is to identify who is telling the story.

this excerpt is part of the book sugar changed the world (2010) written by marc aronson and marina budhos. as the book has been written by two people, the heading "marc" indicates that this specific excerpt is being narrated by aronson. in the fragment, marc describes his grandfather's story after hearing it from his cousin. however, there are other excerpts where budhos is the one that tells the story of her family.

aronson and budhos, who are husband and wife in real life, decided to write sugar changed the world when they found out how sugar, which had an important role in slavery and economy, changed their ancestors' lives.