Final answer:
The pediatrician likely referred to the angular gyrus, a brain region associated with language processing, being larger in the right hemisphere as a potential cause for the boy's dyslexia.
Step-by-step explanation:
Teri's pediatrician's explanation for her son's dyslexia likely involves a discussion of brain structure and language function. While both Broca's area and Wernicke's area are critical to language, dyslexia is more complex and involves additional regions.
One brain region often discussed in the context of dyslexia is the angular gyrus. This region is associated with the processing of written and spoken language and can contribute to the difficulties experienced by individuals with dyslexia when it is larger or functions differently than normal.
In general, the left hemisphere of the brain is predominately responsible for language functions. However, the pediatrician's comment about the right hemisphere being larger suggests atypical brain lateralization or structure, which may contribute to language processing challenges like those seen in dyslexia.
Thus, the answer to the fill-in-the-blank question is most likely 'd. angular gyrus', meaning that Teri's little boy might have a larger angular gyrus in the right hemisphere than is typical, which could be associated with dyslexia.