Ratings of Kinetic Depth in Multi-Dot Displays
Abstract
Subjects viewed kinetic depth displays whose shape (sphere or cylinder) was defined by luminous dots distributed randomly on the surface or throughout the volume of the object. Subjects rated the amount of perceived 3D depth, rigidity, and coherence. (Coherence is high when all the dots are perceived as a single object.) There were significant individual variations in ratings but, on the whole, all three ratings increased with the number of dots. Luminance of dots had no effect on any of the ratings. Points within the volume yielded ratings equal to or greater than surface points. Each of the three rating varied with a least 3 of the 4 factors (shape, distribution, numerosity, and perspective), but the ratings did not necessarily covary either between trials or between conditions-often they were uncorrelated or negatively correlated. For example, object shape affected ratings of rigidity but not of depth; when perceived vertically, polar perspective displays were rated slightly less rigid than parallel projection displays but they received higher depth ratings. (When perceived in reversed perspective, polar displays were grossly nonrigid, independent of the other factors.) The complex but understandable interplay of stimulus parameters and ratings forces a examination of previous experimental results and theories in which different KDE ratings were treated interchangeably.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1989
- Accession Number
- ADA211138
Entities
People
- Barbara A. Dosher
- George Sperling
- Michael S. Landy
Organizations
- New York University