The National Endowment for the Arts announces a new literature review, Audience Impact Study Literature Review.While there is ample qualitative and anecdotal data on how people and communities are transformed by the arts, there is little research that quantifies the emotional impact of the arts.It's a challenge to analyze this subtle topic. How do you define the way that art affects people? By the happiness they express? By the rewards they derive? By their physiological response?Furthermore, how do you measure this emotional impact? This review looks at dozens of existing studies that attempt to answer these elusive questions. Ultimately, this review will help inform the design of a survey that will capture reliable data on this seemingly indefinable subject.