Question

Heather sellers suffers from prosopagnosia and is unable to recognize her own face in a photograph. her difficulty stems from a deficiency in

Answer 1

I believe the answer is: top-down processing.

top-down processing refers to the functional process that started at our thought (brain) and come down to our senses and other functions.
Since she can see other things beside her face, we can conclude that the problem does not start from her sense but from the information that sent by the brain.