1. Assistant Professor, Dept. of Civil Engineering, 151C Raymond Building, Univ. of Kentucky, Lexington, KY 40506-0281 (corresponding author).
2. Nicholas R. Petry Professor, Construction Engineering and Management, Dept. of Civil, Environmental, and Architectural Engineering, Univ. of Colorado, Boulder, CO 80309-0428.
3. Assistant Professor, Dept. of Civil Engineering, 151A Raymond Building, Univ. of Kentucky, Lexington, KY 40506-0281.
4. Professor, Dept. of Psychology and Center for Visualization and Virtual Environments, Univ. of Kentucky, Lexington, KY 40506-0281.