The dual task experiment consists of five stages.
First the subject's short-term memory capacity is determined, the outcome called the "digit span".
Then lists of digits are read to the subject who is asked to repeat the lists, which produces a "task list score".
Stage three involves using a pencil to trace a path through a maze, giving a third score.
In stage four, the subject repeats digit lists while tracing a path, the dual task. The final stage is a retest of stage four.
The study has been published in the Journal of Neurology.
Source-ANI
ARU