后天伦理直觉主义者认为,我们的道德知识是知觉性的知识,它是通过我们的道德知觉所获得的,因此后天伦理直觉主义者试图通过回答"我们有道德知觉吗","我们能通过道德知觉获得道德知识吗","道德知觉是非推论性的吗",这三个问题来为自己辩护。但是反对者提出了因果性反驳和表征性反驳,对道德知觉理论带来了巨大的辩护困难。加上"无基之谈"和"循环困境"的挑战,后天伦理直觉主义者想要继续捍卫自己的观点,那么就必须提供更为令人信服的论证。
Aposteriori ethical intuitionists believe that our moral knowledge is the perceptive knowledge which is acquired by moral perception. So, Aposteriori ethical intuitionists attempt to answer the following questions to defend themselves: Do we have moral perception? Can we acquire moral knowledge by moral perception? Is moral perception non-inferential? However, opponents provide the causal objection and the representation objection to aposteriori ethical intuitionism, which bring great difficulties to justifications of the moral perception theory. Along with the no foundation objection and the circle objection, aposteriori ethical intuitionists have to make more convincing argument if they want to guarantee their standpoint.