One of the first observable symptoms of Alzheimer's disease is the inability to remember familiar names. (sciencedaily.com)
In today's society, he would be viewed as data - driven, and he taught his students to simply describe observable symptoms rather than try to interpret them. (motherhoodinpointoffact.com)
Unfortunately, this does not necessarily result in the development of overt, clinically observable symptoms - Thornburg and his colleagues (1985) reported that overt clinical signs of liver disease do not generally occur until the dog is several years old. (thebedlingtonterrierhealthgroup.webplus.net)