There is research on the effects of hg on brain cells. If you have a scientific background, check out Pharmacol 26, 1984 pg360.
There is also research showing that hg produces the neurofibrillary tangles characteristic of Alzheimer's.
In any case ,don't you only have two fillings? Your hg exposure is not that high compared to most of us in the forum .In high school I had many alalgam fillings and stll scored in the 99th percentile in math on the SAT. I also got mostly As in calculus chemistry, physics etc at a competitive college.I think hg affects memory more than other intellectual functions. Then againhg effects are cummulative and I dont know what I would get on the SAT today after all the years of hg exposure.