HoHCI-BikeSteering/Assets/Scripts/Study/SubjectManager.cs

using System;
using UnityEngine;

namespace Study
{
    public class SubjectManager : MonoBehaviour
    {
        public string subjectIdentifier;

        private void OnEnable()
        {
            if (string.IsNullOrEmpty(subjectIdentifier))
                throw new Exception("You have to specify a subject for the experiment!");

            var bikePlayer = GameObject.Find("bike");
            var playerStats = bikePlayer.GetComponent<PlayerStats>();
            playerStats.SetParticipantID(subjectIdentifier);
        }
    }
}