I felt like my normal smart self when I was taking Lithium and Risperidone. I don't know about Lamictal. For me, I remember everything from depression and mixed states, but only about 50% of what happens when I'm manic. Seroquel seems to mess with my cognition, but not memory (basically just makes me slow because I'm tired all the time). I haven't noticed really any effect on my memory from meds, but there is clear correlation between me being manic and me not remembering anything. So I can imagine it could work the same way for you and depression.