²The influence of the subjectivity and contextuality of perception, and ensuing possibilities of reducing frustration by changing the perception, are actually quite complex phenomena and create many further possibilities of reducing the term being considered here. Logically, we might also try to increase the perceived obtained reward independently of the actual reward obtained. This may be possible by somehow learning to better appreciate the rewards obtained, but I will not develop that idea any further here. In fact, it may not always be possible to distinguish between the actual reward and the perceived reward: the reward may not have any objective definition, as may be obvious in the case of winning a Porsche. Likewise, it might be possible to somehow reduce the perceived reward loss even if the actual reward and the expected reward are unchanged, but I cannot very easily think of a method to achieve that; seeing the reward loss as a useful learning signal would be a bit in that direction.