Abstract
This chapter discusses some concerns regarding the effects of enhancement technologies on autonomy and authenticity, insofar as authenticity relates to autonomy. As a preliminary, it describes how enhancement and autonomy should be understood in this context along with some examples of enhancement. The chapter moves on to explain why enhancement can promote autonomy. Three types of concerns regarding the effect of enhancement technologies on autonomy are raised: (i) that medical technologies should not be used to enhance autonomy, since this is not the proper use of such technologies; (ii) that some enhancement technologies are inimical to our authenticity; and (iii) that the widespread use of some enhancement technologies have negative overall consequences on people's autonomy. Different kinds of enhancements typically arouse different kinds of concerns as regards autonomy. These include cognitive, mood, physical, and aesthetic enhancement.