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Fixation

The fixation construct provides a timed fixation for use in trials. All the fixation properties along with start time, end time and (actual) duration are recorded.

Creating a fixation

Fixations can be added to trials timelines. Click New item, select Fixation from the type list and select one of the following creation options:

  • New: create a new fixation.
  • Copy: copy another fixation from the current study.
  • Clone (from a different trial): clone an existing fixation from another trial.

Editing fixation

Click anywhere along its row (Figure 1) to open the editor.

Figure 1. Open construct editor (Psychstudio)

Figure 1. Open construct editor

Editing timing

In edit mode, the following properties can be set via the timing table:

  • Start mode
    • 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.
  • Start time (ms): when to initiate construct.
  • Duration mode
    • Fixed: duration will be a fixed time period.
    • Random: duration will be a random time period bound by minimum and maximum values.
    • Factor: duration will be a randomly chosen level from the factor selected.
    • Level: duration will be set to the value of the chosen level.
  • Timeout (ms): duration of construct presence.

Editing style

In edit mode, the following properties can be set via the style table:

  • Type
  • Size
  • Color