Cognitive-motor interference during functional mobility after stroke: State of the science and implications for future research

If I think hard about something, any motor performance drops to nil. I think a lot of this is because I blew out my pre-motor cortex so my executive control  needs to be in control and since multitasking does not exist I lose one or the other. But don't listen to my blatherings. But for some reason I can walk and talk now at the same time. At first that was impossible.
http://search.naric.com/research/rehab/redesign_record.cfm?search=2&type=all&criteria=J67620&phrase=no&rec=123389
NARIC Accession Number: J67620.  What's this?
ISSN: 0003-9993.
Author(s): Plummer, Prudence; Eskes, Gail; Wallace, Sarah; Giuffrida, Clare; Fraas, Michael; Campbell, Grace; Clifton, KerryLee; Skidmore, Elizabeth R..
Publication Year: 2013.
Number of Pages: 10.
Abstract: This review examines the specific patterns of cognitive-motor interference (CMI) found in published studies comparing single-task and dual-task performance of cognitive and motor tasks during gait and balance activities after stroke. CMI is evident when simultaneous performance of a cognitive task and a motor task results in deterioration in performance in one or both of the tasks, relative to performance of each task separately. The literature was examined for associations between patterns of CMI and a history of falls, as well as evidence for the effects of rehabilitation on CMI after stroke. Overall, the evidence suggests that during gait activities with an added cognitive task, people with stroke are likely to demonstrate significant decrements in motor performance only (cognitive-related motor interference), or decrements in both motor and cognitive performance (mutual interference). In contrast, patterns of CMI were variable among studies examining balance activities. Comparing people poststroke with and without a history of falls, patterns and magnitude of CMI were similar for fallers and nonfallers. Longitudinal studies suggest that conventional rehabilitation has minimal effects on CMI during gait or balance activities. However, early-phase pilot studies suggest that dual-task interventions may reduce CMI during gait performance in community-dwelling stroke survivors.