Table 1 Search stages, number of paper retained in each database, and key terms used in the search

1. age or old$ or "advanced age" or senior$ or elder$ or geriatric$ or aged or eldest or geronic or aging

5,071,761

3,934,136

577,515

2. "corresponding task$" or "coupled task$" or "dual task$" or "dual task paradigm$" or "secondary task" or "conflicting task" or "task priori#ation" or "inattentional blindness"

2,141

2,743

2,986

3. practice or train$ or improve$ or exercise or treatment or intervention

3,542,216

4,936,819

793,454

4. motor or move$ or balance or posture or standing or walking

643,441

726,053

179,721

5. Combination of 1 and 2 and 3 and 4

195

187

75

Assessment based on title and abstract

55

42

29

Assessment based on reading the whole paper

40

25

9

Total number of included papers

13