FAQ: Why can't I see any pupil size data in my Trial Report or Sample Report?

[SR-SUPPORT]

Data Viewer works with two types of pupil size data recorded in your EDF files:

• Sample Data: The pupil size is recorded for every sample (e.g., every millisecond). This granular data is used in Trial Reports and Sample Reports.
  
• Fixation-Averaged Data: The average pupil size is calculated across the duration of each fixation. This data is used in all other reports (e.g., Fixation Report).
  

Pupil size data may be missing from your Trial or Sample Reports if the raw sample data was not loaded during the import process. This was the default behavior in older versions of Data Viewer.

To resolve this, you must enable sample loading and re-import your data:

• Enable Sample Loading: In the Inspector window, navigate to Preferences > Data Loading and check the box for Load Samples.
  
     
• Remove Existing Data: In the Inspector list, right-click your currently loaded EDF files and select Delete.
  
• Re-import Data: Go to File > Import Data > Multiple EyeLink Data Files... and select your EDF files again.
  

Your Trial and Sample Reports should now correctly include the pupil size data.