Document Detail


The effect of notched noise on flicker detection and discrimination.
MedLine Citation:
PMID:  19757899     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Flicker perception was investigated using two-alternative forced-choice detection and discrimination tasks with four different types of external noise: (1) broadband noise, (2) 5-Hz notched-noise--broadband noise with a 5-Hz band centered on the signal frequency removed, (3) 10-Hz notched-noise, and (4) no external noise. The signal was a burst of 10-Hz sinusoidal flicker presented in one of two observation intervals. In discrimination experiments, a pedestal--sinusoidal flicker with the same frequency, duration, and phase as the signal--was added to both observation intervals. With no noise, observers' performance first improved with increasing pedestal modulation, before deteriorating in accordance with Weber's Law, producing the typical "dipper" shaped plot of signal versus pedestal modulation. Noise affects performance, but the dipper effect persisted in each type of noise. The results exclude three models: the ideal-observer in which the pedestal improves performance by specifying the signal exactly; off-frequency-looking models in which the dipper depends on detection by channels tuned to temporal frequencies different from that of the signal; and strict energy detectors. Our data are consistent with signal processing by a single mechanism with an expansive non-linearity for near-threshold signal modulations (with an exponent of six) and a compressive "Weberian" non-linearity for high modulations.
Authors:
Hannah E Smithson; G Bruce Henning; Donald I A MacLeod; Andrew Stockman
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't     Date:  2009-05-21
Journal Detail:
Title:  Journal of vision     Volume:  9     ISSN:  1534-7362     ISO Abbreviation:  J Vis     Publication Date:  2009  
Date Detail:
Created Date:  2009-09-17     Completed Date:  2009-12-22     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101147197     Medline TA:  J Vis     Country:  United States    
Other Details:
Languages:  eng     Pagination:  21.1-18     Citation Subset:  IM    
Affiliation:
Department of Psychology, Durham University, Durham, UK. hannah.smithson@durham.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Contrast Sensitivity
Discrimination (Psychology) / physiology*
Flicker Fusion / physiology*
Humans
Male
Middle Aged
Perceptual Masking / physiology*
Photic Stimulation
Visual Perception / physiology*
Grant Support
ID/Acronym/Agency:
EY01711/EY/NEI NIH HHS; //Biotechnology and Biological Sciences Research Council; //Wellcome Trust

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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