ABSTRACT
The* rapid development of scientišc knowledge about the genetic and chemical basis for disease has led, perhaps inevitably, to debate over the acceptability of using new medical technologies for nontherapeutic improvements or enhancement purposes† (Selgelid 2007). The idea that it may be possible to improve human beings who are already well, either by more efšcient means toward familiar ends, or in hitherto unprecedented ways, has proved highly controversial. The debate about enhancements is now at least a decade old, and it has generated what have now become familiar views about their moral acceptability (Buyx 2008; Glannon 1998, 12; Harris
Cognitive Enhancements and Analogies ................................................................ 247 Reasoning by Analogy ......................................................................................248 Environmental Enhancement of Memory .........................................................249 Nonenvironmental Enhancements .....................................................................250
