internal void DecayEmotion(EmotionalAppraisalAsset parent)
{
var delta = parent.Tick - tickATt0;
double lambda = Math.Log(parent.HalfLifeDecayConstant) /parent.EmotionalHalfLifeDecayTime;
float decay = (float)Math.Exp(lambda * this.Decay * delta);
Intensity = intensityATt0 * decay;
}