It's going to vary a fair bit on the conditions. Dr. Lemire used the example of multiple sclerosis. I worked as a rehab psychologist for many years with people who have acquired conditions affecting the brain and spinal cord, like MS. One of its hallmarks is its course can be very unpredictable, so it may be very difficult to say when someone who has motor problems primarily as a result of their MS then acquires cognitive ones.
On May 2nd, 2016. See this statement in context.