Reply: Functional cognitive disorder: dementia’s blind spot

Abstract

We welcome the comments from Kapur et al.¹ and the opportunity to clarify the meaning of internal inconsistency. This is not equivalent to identifying fluctuations over time, since that could occur for many reasons. Rather, the defining feature of internal inconsistency is contrasting function and dysfunction, ideally demonstrable at the same time, analogous to Hoover’s sign in functional motor weakness. Function should be tested using different approaches to see if discrepant results are obtained. This would indicate a lack of factors other than attention and focus that can explain it. When one encounters either temporal variability, or subjective cognitive concern but no objective...