Table 2.

Summary of cognitive tasks for dual-task gait training.

Task	Description
Random number/letter generation	(i) Randomly naming numbers between 100 and 500 (without repetition or consecutively) (ii) Randomly naming odd (or even) numbers between 1 and 100 (without repetition or consecutively) (iii) Randomly naming consonants of the alphabet (without repetition or consecutively)
Word association	Easy: (i) naming as many words as possible in a category (e.g., animals, fruits) (ii) naming opposites of words Hard: (i) naming as many words as possible beginning with a particular letter (ii) naming as many words as possible in a category (e.g., European cities)
Working memory	Easy: (i) reciting a sequence of numbers (3 or 4 number sequences) (ii) reciting grocery list (3-4 items) Hard: (i) reciting a sequence of numbers (5 numbers per sequence) (ii) reciting grocery items (5 items)
Calculating a time	Easy: adding or subtracting minutes to a given time within the hour (e.g., 3:15 + 5 minutes; 1:30 − 15 minutes) Hard: adding or subtracting minutes to a given time into the next hour (e.g., 4:40 + 25 minutes; 1:15 − 30 minutes)
Backward recitation	(i) Reciting number sequences backward (ii) Months of the year (iii) Days of the week (iv) Backward spelling (4-5 letter words) (v) Counting backward (by 2, 3, 6, 7, and 8; starting between 75 and 100)