Doing things in sequence
The sequence item has two important functions:
- It runs multiple other items one after another.
- It determines which items should, and which shouldn't, be run.
sequences are run from top to bottom; that is, the item at the top is run first. The order of a sequence is always sequential.
Run-if expressions
You can use run-if expressions to determine whether or not a particular item should be run. For example, if you want a display to be presented only if a participant has made an incorrect response, you can set the run-if expressions for that item to:
correct == 0
If you leave the run-if expressions empty or enter True, the item will always be run. Run-if expressions use the same syntax as other conditional expressions. For more information, see:
Run-if expressions only affect which items are run, not which items are prepared. Phrased differently, the Prepare phase of all items in a sequence is always executed, regardless of the run-if expressions. See also:
Disabling items
To completely disable an item in a sequence, right-click on it and select 'Disable'. This is mostly useful during development of your experiment, for example to temporarily bypass the instructions.