You can calculate saccadic reaction times (RTs) using one of two methods, depending on whether you need the data during the experiment or after data collection.
- Method 1: Calculating RTs in Real-Time
Use this method if you need the RT value to control trial logic (e.g., providing immediate feedback).
Use an Update Attribute node to calculate the difference between the Stimulus Display Time and the Saccade Trigger Time.
See the article "How can I accurately keep track of reaction times (RT) for participant responses?" for step-by-step instructions.
- Method 2: Extracting RTs from EyeLink Data Files
If you do not need the RT data live during the trial, it is easier to calculate it after the experiment.
Open your EDF data files in Data Viewer. All necessary event timestamps and coordinates are automatically preserved, allowing for accurate offline analysis.