The keyboard response construct is a container that can house one or more keys to record values and actions, and move the study forward.
Keyboard responses can be added to instructions, questionnaires and trials timelines. To add a keyboard response to a trials timeline, click New item. To add a keyboard response to instructions or questionnaires, click New response. Select
Response - keyboard from the type list and select one of the following creation options:
New: create a new keyboard response.
Copy: copy another keyboard response from the current study.
Clone (from a different trial): clone another keyboard response (trials timeline only).
If the keyboard response is on the trials timeline:
Click anywhere along its row (Figure 1) to open the editor.
In edit mode, click Delete on the key row you wish to remove.
WARNING: Deleting a key will also delete any trials rules related to that key.
If the keyboard response is on the trials timeline, key values can be randomized from those present. In edit mode, when two or more keys are present, you can randomize their values by selecting:
For example, if we have two keys allocated where 'z' = true and 'm' = false, the truth values can be randomly assigned across 'z' and 'm'. Randomization is consistent across all trials, and can be made consistent across multiple trial blocks via block counterbalancing if the keyboard response is a clone.
In edit mode, the following properties can be set via the timing table:
Fixed: start time will be measured from the beginning of the trials timeline.
Offset from previous item: start time will be measured from the end of the previous item on the trials timeline. If there is no previous item, or the timeout of the previous item is set to
nil(infinite), then start time will be measured from the beginning of the trial.