Detection Theory: A User's Guide

By Neil A. Macmillan; C. Douglas Creelman | Go to book overview
Save to active project

7
Comparison (Two-Distribution)
Designs for Discrimination

So far we have discussed only situations in which one stimulus at a time is evaluated. In psychophysics, even these designs are sometimes termed discrimination because they permit estimates of the ability to distinguish two stimuli or stimulus classes, and in common psychological usage discrimination means telling two things apart. In this chapter, we introduce paradigms in which the process of discrimination is more salient because two or more stimuli are explicitly compared on each trial.

There are two types of such paradigms, which we term comparison designs and classification designs. Comparison designs (considered in this chapter) resemble one-interval designs in that the observer makes a binary decision based on an underlying representation containing only two distributions. These paradigms require the observer to make a direct comparison between two stimulus presentations. In classification designs (chap. 9), the observer again compares (two or more) stimuli, but the world of possible stimuli and their representation contains more than two distributions. Because multiple distributions are mapped onto each response, the task facing the observer is more complex than a simple comparison.

There are only two comparison designs: two-alternative forced-choice and the reminder design. It is possible to analyze both with only the one-dimensional, flatland tools of Part I. The advantage of considering two-dimensional representations is that each design offers multiple alternative decision rules, and the perspective of a multidimensional spaceland view renders the relations among these rules more visible. A representation containing a pair of bivariate distributions in a two-dimensional perceptual space was illuminating in analyzing the compound detection problem in chapter 6, and we construct similar decision spaces to describe two-alterna

-165-

Notes for this page

Add a new note
If you are trying to select text to create highlights or citations, remember that you must now click or tap on the first word, and then click or tap on the last word.
Loading One moment ...
Project items
Notes
Cite this page

Cited page

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

Cited page

Bookmark this page
Detection Theory: A User's Guide
Settings

Settings

Typeface
Text size Smaller Larger
Search within

Search within this book

Look up

Look up a word

  • Dictionary
  • Thesaurus
Please submit a word or phrase above.
Print this page

Print this page

Why can't I print more than one page at a time?

While we understand printed pages are helpful to our users, this limitation is necessary to help protect our publishers' copyrighted material and prevent its unlawful distribution. We are sorry for any inconvenience.
Full screen
/ 492

matching results for page

Cited passage

Style
Citations are available only to our active members.
Sign up now to cite pages or passages in MLA, APA and Chicago citation styles.

Cited passage

Welcome to the new Questia Reader

The Questia Reader has been updated to provide you with an even better online reading experience.  It is now 100% Responsive, which means you can read our books and articles on any sized device you wish.  All of your favorite tools like notes, highlights, and citations are still here, but the way you select text has been updated to be easier to use, especially on touchscreen devices.  Here's how:

1. Click or tap the first word you want to select.
2. Click or tap the last word you want to select.

OK, got it!

Thanks for trying Questia!

Please continue trying out our research tools, but please note, full functionality is available only to our active members.

Your work will be lost once you leave this Web page.

For full access in an ad-free environment, sign up now for a FREE, 1-day trial.

Already a member? Log in now.

Are you sure you want to delete this highlight?