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The role of high-performance in neuropsychology

As far as I understand, neuropsychology gains most of its insights from the reconciliation of lesions of the brain and cognitive impairments. Normal functioning (both of the brain and the mind) plays a less important role in neuropsychology.

My question is:

Which role does cognitive high-performance play in neuropsychology? Which attempts are there to map cognitive high-performance processes to neurophysiological structures and processes?

Examples of cognitive high-performance:

The mere fact that for such high-performers there are possibly enlarged (and internally more strongly and probably more specifically connected) areas of the brain (and connections between them) is not what I am looking for. Especially for the more mathematical and intricate cases there must be more than that.

The main difference between neuropsycholgy by impairment and neuropsychology by high-performance seems to be that in the former case you can more easily perform statistical studies (but also single-case studies), in the latter case you can only perform single-case studies.