Clay, O. J., Edwards, J. D., Ross, L. A., Okonkwo, O., Wadley, V. G., Roth, D. L., & Ball, K. K. (2009). Visual function and cognitive speed of processing mediate age-related decline in memory span and fluid intelligence.

Clay, Olivio J., Jerri D. Edwards, Lesley A. Ross, Ozioma Okonkwo, Virginia G. Wadley, David L. Roth, and Karlene K. Ball. Visual Function and Cognitive Speed of Processing Mediate Age-related Decline in Memory Span and Fluid Intelligence. 2009.

Clay, Olivio J., et al. Visual Function and Cognitive Speed of Processing Mediate Age-related Decline in Memory Span and Fluid Intelligence. 2009.