Document Detail


Multiple serial picture presentation with millisecond resolution using a three-way LC-shutter-tachistoscope.
MedLine Citation:
PMID:  20122963     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Throughout recent years there has been an increasing interest in studying unconscious visual processes. Such conditions of unawareness are typically achieved by either a sufficient reduction of the stimulus presentation time or visual masking. However, there are growing concerns about the reliability of the presentation devices used. As all these devices show great variability in presentation parameters, the processing of visual stimuli becomes dependent on the display-device, e.g. minimal changes in the physical stimulus properties may have an enormous impact on stimulus processing by the sensory system and on the actual experience of the stimulus. Here we present a custom-built three-way LC-shutter-tachistoscope which allows experimental setups with both, precise and reliable stimulus delivery, and millisecond resolution. This tachistoscope consists of three LCD-projectors equipped with zoom lenses to enable stimulus presentation via a built-in mirror-system onto a back projection screen from an adjacent room. Two high-speed liquid crystal shutters are mounted serially in front of each projector to control the stimulus duration. To verify the intended properties empirically, different sequences of presentation times were performed while changes in optical power were measured using a photoreceiver. The obtained results demonstrate that interfering variabilities in stimulus parameters and stimulus rendering are markedly reduced. Together with the possibility to collect external signals and to send trigger-signals to other devices, this tachistoscope represents a highly flexible and easy to set up research tool not only for the study of unconscious processing in the brain but for vision research in general.
Authors:
Florian Ph S Fischmeister; Ulrich Leodolter; Christian Windischberger; Christian H Kasess; Veronika Sch?pf; Ewald Moser; Herbert Bauer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-02-01
Journal Detail:
Title:  Journal of neuroscience methods     Volume:  187     ISSN:  1872-678X     ISO Abbreviation:  J. Neurosci. Methods     Publication Date:  2010 Mar 
Date Detail:
Created Date:  2010-03-04     Completed Date:  2010-05-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7905558     Medline TA:  J Neurosci Methods     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  235-42     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2010 Elsevier B.V. All rights reserved.
Affiliation:
MR Centre of Excellence, Medical University of Vienna, Lazarettgasse 14, A-1090 Vienna, Austria. florian.fischmeister@meduniwien.ac.at
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MeSH Terms
Descriptor/Qualifier:
Computers
Data Interpretation, Statistical
Equipment Design
Humans
Liquid Crystals
Magnetic Resonance Imaging
Photic Stimulation / instrumentation*
Physical Stimulation
Reproducibility of Results
Subliminal Stimulation*
Unconscious (Psychology)
Visual Perception / physiology*

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


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