 As noted earlier, Batson and his colleagues have also designed experiments pitting the empathy-altruism hypothesis against a substantial list of other egoistic explanations for the link between empathy and helping behavior. In each case, the evidence appears to challenge the egoistic alternative, though as is almost always the case in empirical work of this sort, some researchers remain  unconvinced.[18]  There is however, an influential critique of Batson’s work that challenges all of his experimental work on the empathy-altruism hypothesis. It argues that empathy and its precursors alter people’s self-concept in a way that undermines the claim that their helping behavior is genuinely altruistic.