Accession Number : ADA138853

Title :   Detection of Dotted Forms in a Structured Visual Noise Environment.

Descriptive Note : Technical rept.,


Personal Author(s) : Young,M J

PDF Url : ADA138853

Report Date : 01 Mar 1984

Pagination or Media Count : 56

Abstract : Five experiments are described which explore the human observer's ability to detect single dotted lines masked by other dotted lines. Stimuli are presented tachistoscopically on a computer controlled cathode ray tube. Results indicate that: Rotations of the stimuli, relative to the orientation of the noise lines, improve detection performance only if the rotations are made around the Z axis. Rotations around the Y axis fail to improve detection performance. The mechanism involved in the detection of dotted forms uses different strategies or algorithms depending upon the density of the noise mask. Orienting the stimulus and masking lines to other than the horizontal decreases detection performance. The results are discussed in the context of model incorporating a variable aperture attentional process. (Author)

Descriptors :   *Visual perception, *Performance(Human), *Detection, *Images, *Spot tests, Cathode ray tubes, Vision, Stimuli, Masking, Orientation(Direction), Noise, Lines(Geometry), Test methods, Algorithms, Computers, Environments, Experimental data

Subject Categories : Personnel Management and Labor Relations
      Anatomy and Physiology
      Computer Hardware

Distribution Statement : APPROVED FOR PUBLIC RELEASE