Go to the NASA Homepage
 
Search >
Click to Search
Human Systems Integration Division homepageHuman Systems Integration Division homepage Organization pageOrganization page Technical Areas pageTechnical Areas page Outreach and Publications pageOutreach and Publications page Contact pageContact page
Human Systems Integration Division Homepage
Outreach & Publications Sidebar Header
Go to the Outreach & Publications pageGo to the Outreach & Publications page
Go to Awards pageGo to Awards page
Go to News pageGo to News page
Go to Factsheets pageGo to Factsheets page
Go to Multimedia pageGo to Multimedia page
Go to Human Factors 101 pageGo to Human Factors 101 page
What is Human System Integration? Website
Publication Header
Letter identification: Contrast polarity and speed-accuracy trade-off strategies  (2003)
Abstract Header
Previous work examined only at the speed (latency) or the accuracy of responses in letter identification, trying to quantify the effects of contrast polarity (black on gray vs. white on gray) on letter identifiability. Scores combining speed and accuracy show a different interaction of the polarity effect with contrast than latency or accuracy scores alone, and generate larger statistical effects for the polarity effect. Signal detection theory has shown that, because of response biases, it is necessary for detection experiments to have false alarms to accurately estimate detectability when response biases are present. Speed-accuracy trade-off theory shows that non-zero error rates are necessary to estimate effective stimulus strength in the presence of changing strategies. Results show that a very simple measure of effective stimulus strength can effectively be used to compensate for observers changing response strategies trading off speed and accuracy.
Private Investigators Header
Authors Header
Groups Header
none
Keywords Header
none
References Header
none
Go to the First Gov Homepage
Go to the NASA - National Aeronautics and Space Administration Homepage
Curator: Phil So
NASA Official: Jessica Nowinski
Last Updated: August 15, 2019