Accession Number:

ADA235035

Title:

The Effects of Display Failures and Symbol Rotation on Visual Search and Recognition Performance

Descriptive Note:

Technical memo. (Final)

Corporate Author:

HUMAN ENGINEERING LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

• Decker, Jennie J.
• Dye, Craig J.
• Lloyd, Charles J.
• Snyder, Harry L.

Report Date:

1991-02-01

Pagination or Media Count:

44.0

Abstract:

This study was conducted to investigate the effects of display failures and rotation of dot-matrix symbols on visual search and recognition performance. The type of display failure cell, horizontal line, vertical line, failure mode On, failures matched the symbols Off, failures matched the background, percentage of cells failed 0,1,2,3,4, and rotation angle 0 deg, 70 deg, 105 deg were the variables examined. Results showed that displays that exhibit On cell failures greater than 1 significantly affect search time performance. Cell failures degrade performance more than line failures. Search time and accuracy are best when symbols are oriented upright. The effects of display failures and rotation angle on search time were found to be independent. Implications for display design and suggestions for quantifying the distortion caused by rotation are discussed.

Descriptors:

• *DISPLAY SYSTEMS
• ANGLES
• FAILURE
• ACCURACY
• TIME
• VERTICAL ORIENTATION
• SEARCHING
• RECOGNITION
• VISUAL PERCEPTION
• HORIZONTAL ORIENTATION
• SYMBOLS
• ROTATION
• DISTORTION

Subject Categories:

• Psychology
• Anatomy and Physiology
• Electrooptical and Optoelectronic Devices
• Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE