The counterbalance construct group provides a placeholder for one or more constructs on the trials timeline. This group can be allocated to one or more cells on the trials screen for random construct selection and/or random spatial allocation of constructs on each trial.
For example:
Counterbalance construct groups can be added to trials timelines. Click New item, select Counterbalance construct group
from the type list and select one of the following creation options:
New
: create a new counterbalance construct group.Copy
: copy another counterbalance construct group from the current study.Click anywhere along its row (Figure 1) to open the editor.
Any number of constructs can be added to a counterbalance construct group. In edit mode, click on the Construct
dropdown menu and select New item...
(Figure 2)
When creating a new construct, you can choose to start with a blank slate, to copy an existing construct from this or another trial, or to clone an existing construct from another trial.
Cloning is an important part of response button position randomization and response keyboard key value randomization across multiple trial blocks.
In edit mode, click on the Construct
dropdown menu and select the construct that you wish to edit (Figure 3). For details on editing specific constructs, please see their individual reference documentation.
In edit mode, click on the Construct
dropdown menu and click Delete next to the corresponding construct (Figure 3).
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.