NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Masking by Gratings Predicted by an Image Sequence Discriminating Model: Testing Models for Perceptual Discrimination Using Repeatable NoiseAdding noise to stimuli to be discriminated allows estimation of observer classification functions based on the correlation between observer responses and relevant features of the noisy stimuli. Examples will be presented of stimulus features that are found in auditory tone detection and visual vernier acuity. using the standard signal detection model (Thurstone scaling), we derive formulas to estimate the proportion of the observers decision variable variance that is controlled by the added noise. one is based on the probability of agreement of the observer with him/herself on trials with the same noise sample. Another is based on the relative performance of the observer and the model. When these do not agree, the model can be rejected. A second derivation gives the probability of agreement of observer and model when the observer follows the model except for internal noise. Agreement significantly less than this amount allows rejection of the model.
Document ID
20020061372
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Ahumada, Albert J., Jr.
(NASA Ames Research Center Moffett Field, CA United States)
Null, Cynthia H.
Date Acquired
August 20, 2013
Publication Date
January 1, 1998
Subject Category
Behavioral Sciences
Meeting Information
Meeting: Twenty-First European Conference on Visual Perception
Location: Oxford
Country: United Kingdom
Start Date: August 24, 1998
End Date: August 28, 1998
Funding Number(s)
PROJECT: RTOP 548-50-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available