 Nonetheless, providing an adequate theory to account for the FMS of unimpaired infants and cognitively impaired human beings (whether infants or adults) without attributing the same status to most animals has proven very difficult. In fact, our survey in section 5 suggests that this challenge has not been fully met by any of the existing accounts of the grounds of moral status. Some philosophers have, as a result, questioned or even abandoned this seemingly commonsense view, including the aspect that holds that all adult cognitively unimpaired human beings have FMS (see the end of section 4).