Date of Award
Summer 2018
Degree Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Psychology
Committee Chair
Alen Hajnal
Committee Chair Department
Psychology
Committee Member 2
Donald Sacco
Committee Member 2 Department
Psychology
Committee Member 3
Richard Mohn
Committee Member 3 Department
Educational Research and Administration
Committee Member 4
Gabor Legradi
Abstract
Perceiving distance is at the heart of everyday actions like reaching for a cup of coffee. This action may depend on the biomechanical restrictions of the actor (arm-length), the physical distance of the cup, and environmental variables such as surface luminance and texture. Four experiments were conducted to investigate the roles of two environmental variables (surface luminance and surface texture discontinuities) and two movement variables (average magnitude head displacement and the multifractal structure of head motion) in the perception of object reachability in virtual reality. Results suggest that surface texture discontinuities and overall surface luminance affect reaching judgments in different contexts, with exploration patterns modulating each effect. Luminance was a stronger factor than discontinuity, and average magnitude head displacement modulated the effects of the environmental variables more than multifractality. In complex stimulus conditions, dynamic parameters (e.g., movement) predicted perceptual responses above and beyond static parameters alone. In addition, the temporality of environmental variables appears to influence the modeling of the perceptual response based on the conjecture that discontinuity is necessarily explored over time and space, whereas homogeneous luminance does not have to be. In the context of reaching tasks in virtual reality, more movement appears to generate richer optic structure helping to reveal the effects of surface texture variables in judging object reachability.
ORCID ID
0000-0002-3904-7207
Copyright
2018, Jonathan K. Doyon
Recommended Citation
Doyon, Jonathan K., "It’s in the Way You Move: The Effects of Surface Luminance and Texture Discontinuities on Object-Reachability Revealed by Head-Motion in Virtual Reality" (2018). Dissertations. 1557.
https://aquila.usm.edu/dissertations/1557