1. Anderson, J. R., Kuwahata, H., Kuroshima, H., Leighty, K. A., & Fujita, K. 2005. Are monkeys aesthetists? Rensch (1957) revisited. Journal of Experimental Psychology, 31, 71-78.
2. Andrews, M. W., & Rosenblum, L. A. 1993. Live-social-video reward maintains joystick task performance in bonnet macaques. Perceptual and Motor Skills, 77, 755-763.
3. Blatter, K., & Schultz, W. 2006. Rewarding properties of visual stimuli. Experimental Brain Research, 168, 541-546.
4. Bornstein, R. F. 1989. Exposure and affect: Orverview and meta-analysis of research, 1968-1987. Psychological Bulletin, 106, 265-289.
5. Butler, R. A. 1954. Incentive conditions which influence visual exploration. Journal of Experimental Psychology, 48, 19-23.