A robotic baby seal designed to make seniors feel better is fueling an ethical debate. At issue is the appropriate role of such “medical devices.” Advocates believe that the device, which serves as a low-maintenance alternative to therapy pets, helps comfort older patients. They view the product as especially useful for people with dementia, as such residents may need emotional support beyond what humans can give. But others hardly feel warm and fuzzy about the development. They see human-to-human interaction being compromised and corrupted by a $6,000 gadget.