In lieu of an abstract, here is a brief excerpt of the content:The Ambiguities of Mild Cognitive ImpairmentTim Thornton (bio)Keywordsclassification, disease, mild cognitive impairment, normative, valuesCorner and Bond's paper (2006) raises some key ethical questions about the classification and diagnosis of mild cognitive impairment (MCI). In this commentary, I wish to revise some of the general issues about the classification of mental disorder raised by this particular classificatory concept. The central issue raised is the connection between the pathologic status of (...) a condition and what I term the plain facts about the frequency and nature of its symptoms.There are a number of ethical questions raised by applying the label of MCI. Centrally, perhaps, is the concern, illustrated by the case vignettes, that a diagnosis carries negative repercussions that might outweigh the more narrowly medical advantages of an early diagnosis. But although that concern may be appropriate, such ethical complications are a danger of any psychiatric classification or diagnosis, even the most well grounded. Any psychiatric diagnosis can carry a danger of stigma, for example.What seems to make such ethical concerns more serious in this case—at least to a philosopher outsider—is the implicit further concern that MCI is not a real, objective, or, to use a more medical term, valid category or classification. If it is not valid, then any negative connotations of the diagnosis will not be outweighed by medical technological achievements. In other words, the further ethical issues are given much greater weight if the question of validity is not satisfactorily resolved.The question of the reality, objectivity, or validity of MCI can be divided into two issues:1. Is MCI a real, objective, or valid feature of psychological phenomenology?2. Is MCI a real, objective, or valid psychological illness, disease, or pathology?A condition might be a real, objective, or valid feature of psychological phenomenology without being a real illness. It might be some other aspect of human living. Szasz (1960) suggests that this is the case with mental illness (he might more properly say "so-called mental illness") as a whole. But, less controversially, the unusual ability to calculate, mentally and in a flash, the date of future Easter Sundays is a genuine feature of human living—some people possess the ability even if most do not—without either it, or its lack, being an illness. Being real as an illness is a very specific kind of being. It is this, I suggest, that raises difficulties in the case of MCI by contrast with the easier question of whether something is a genuine feature of human living in some other way. [End Page 21]From "normal" and "normative" to "correct" and "incorrect"Corner and Bond (2006) usefully suggest that the question of whether MCI is real is made more difficult by an ambiguity in the sense of the word normal. They suggest that although "physiologic and cognitive decline is assumed to be a normal experience" this still leaves "boundary problems" about "distinguishing normal aging from disease" (Corner and Bond 2006, 3–4). Thus, if the symptoms of MCI are continuous with the ordinary phenomena of physiologic and cognitive decline, then they might also be merely normal. But this does not settle the status of MCI because normal can mean either "normative, that is, usual; or it can mean nonpathologic" (Corner and Bond 2006, 4).On the assumption that MCI is at least continuous with phenomena that are normal, then its symptoms might be normal in the sense of usual but nevertheless pathologic: an inevitable illness. Or they might be usual and nonpathologic, that is, merely a feature of aging that, although regrettable, lacks the connotations of illness (e.g., the appropriateness, if not the possibility, of treatment). (In principle on the assumption in play—that the symptoms of MCI are normal—they might be unusual but nonpathologic akin, for example, to an improved ability to solve crosswords with age that might affect a small lucky proportion of the population. Perhaps such a crossword puzzler might be reassured by their doctor: "Well that is very unusual but there is no need to worry: it is not a symptom of any illness. You are perfectly normal.")Thus the question "Is MCI normal... (shrink)