Add trials during session - immersivecognition/unity-experiment-framework GitHub Wiki

You can add trials as a session is running ("on-the-fly") if this suits your experimental design. This can be used for staircase designs or similar. To do this, just create a trial on a desired block as needed. First in the below example, let's create some trials before our session starts, as normal.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// add the UXF namespace
using UXF;

public class SessionGenerator : MonoBehaviour
{     
   // assign this as the first element in the "On Session Begin" event in the Session component inspector
   public void GenerateExperiment(Session session)
   {
       // create block of 20 trials
       Block block1 = session.CreateBlock(20);       
   }
}

Elsewhere, we can create functionality captures participant responses, and stores them in trial.result. Then when the trial has ended, we can run a method to create a new trial if required, for example based on the trial response.

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

// add the UXF namespace
using UXF;

public class ExtraTrialCreator : MonoBehaviour
{     

    // assign this method in the "On Trial End" event in the Session component inspector
    public void CreateAndRunNewTrialIfNeeded(Trial trial)
    {
        // example - create a new trial if participant answer is above 5
        int answer = trial.result["answer"];
        
        if (answer > 5)
        {
            // create new trial with "example" setting assigned to value 1234.
            Trial newTrial = trial.block.CreateTrial();
            newTrial.settings.SetValue("example", 1234);

            // we could also directly start the newly created trial. this will skip past all the trials we had left to go.
            newTrial.Begin();
        }
        else
        {
            // otherwise, we can end the session...
            if (trial == trial.session.LastTrial)
            {
                trial.session.End();
            }
            // or start the next trial.
            else 
            {
                trial.session.NextTrial.Begin();
            }
        }
 
    }
}