Table 1.
Description of the cognitive test battery, NutriNet-Santé Study.
| Task name | Cognitive processes involved | Task description | Outcome variables |
| Click | Visual-motor coordination, psychomotor speed, selective attention | Numbers (1-5) are connected in ascending order (as fast as possible). A set of three consecutive trials is completed. The task is similar to part A of the Trail Making Testa. | Mean time taken (seconds) |
| Maze (Maze A, Maze B) | Episodic memory, procedural memory, working memory, visuospatial attention, executive function (planning, inhibition, mental flexibility) | A labyrinth path is discovered by the participant, who has to respect several different rules. First, a set of three consecutive trials is completed. Next, after performing the Cards task, the Marbles task, and a supplemental unrelated task (with a duration of a few minutes), the participant is presented with a final (fourth) trial. The task was adapted from the Groton Maze Learning testb. | Total time taken (seconds); number of total clicks (n); number of total errors (n)—These variables are calculated separately for the initial 3 trials (Maze A) and the final trial (Maze B) |
| Cards | Working memory, executive function (inhibition, mental flexibility), sustained attention | Matching-to-sample (one-back type) task: cards are continuously presented to the participant, who must decide whether or not a presented card is the same as the one shown just before. | ([1/ (incorrect answers+1000)] /time) * 100,000 |
| Marbles | Visual memory, episodic memory, associative memory | The participant is presented with a central marble and several colored peripheral marbles. First, the color patterns of each marble have to be memorized. Second, the colors of the peripheral marbles disappear and the central marble continuously takes on different colors, and the participant has to click on the peripheral marble corresponding to the color shown. | ([1/ (incorrect answers+1000)] /time) * 100,000 |