AN EXPERIMENTAL COMPARISON OF YES-NO AND FORCED CHOICE TECHNIQUES

Title AN EXPERIMENTAL COMPARISON OF YES-NO AND FORCED CHOICE TECHNIQUES
Author, Co-Author Gilbert Pierce, Ewen King-Smith
Topic
Year
1992
Day
Sunday
Program Number
2:00 pm
Room
Ireland B
Affiliation
Abstract It has been suggested that a forced choice method should be used for clinical threshold testing because threshold should be independent of the observer's criterion. In this study, a modified QUEST technique was used to measure thresholds in 19 normal observers using yes-no and two alternative forced choice (2AFC) methods. Each observer performed 3 sessions, each separated by one week. Each session consisted of two yes-no and two 2AFC experiments. In each experiment, two independent threshold measurements were made in 30 trials for both white and equiluminous red spots. The within- experiment measurement error for yes-no experiments was significantly lower than for 2AFC (S.D. of .0399 vs .0960 log units, pVISUAL PERFORMANCE STABILITY WITH DISPOSABLE CONTACT LENSES
Affiliation of Co-Authors
Outline