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      • Record: found
      • Abstract: found
      • Article: found

      Effect of Hemifield Stimulation on Simultaneous Steady-State Pattern Reversal Electroretinogram and Visual Evoked Response

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          Abstract

          Steady-state pattern reversal electroretinograms (PERG) and pattern reversal visual evoked responses (PVER) were recorded simultaneously in 4 normal subjects using hemifield stimulation of the upper/lower and nasal/temporal conditions with 95 and 60% stimulus contrasts. A square-wave checkerboard pattern (check size 40 min of arc) was used. The temporal frequency (reversal rate) was 6 Hz (12 reversals/s). With nasal/temporal hemifield stimulation, neither the PERG nor the PVER amplitudes differed significantly with either stimulus contrast. With the upper/lower hemifield stimulation, PERG amplitudes were not significantly different; PVER showed a significantly larger amplitude for lower than for upper hemifield stimulation with both contrasts (ANOVA test: p = 0.0064, 95% contrast; p = 0.0018, 60% contrast). PVER amplitudes recorded with lower hemifield stimulation were 2.05 and 2.63 times larger than those elicited with upper hemifield stimulation, for the 95 and 60% contrasts, respectively. The difference in response to the upper/lower hemifield stimulation, observed only in PVER, suggests that the lower stimulus field dominancy may be processed in a visual pathway proximal to the retinal level.

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          Author and article information

          Journal
          Journal ID (publisher-id): ORE
          Journal ID (nlm-ta): Ophthalmic Res
          Journal ID (doi): 10.1159/issn.0030-3747
          Title: Ophthalmic Research
          Publisher: S. Karger AG
          ISSN (Print): 0030-3747
          ISSN (Electronic): 1423-0259
          Publication date Subscription-year: 1993
          Publication date (Print): 1993
          Publication date (Electronic): 11 December 2009
          Volume: 25
          Issue: 2
          Pages: 119-127
          Affiliations
          aDepartment of Ophthalmology, bSchepens Eye Research Institute, Harvard Medical School; cRetina Associates, Boston, Mass., USA; dDepartment of Ophthalmology, Tokyo Women’s Medical College, Tokyo, Japan
          Article
          Publisher ID: 267274 Other ID: Ophthalmic Res 1993;25:119–127
          DOI: 10.1159/000267274
          PubMed ID: 8321516
          SO-VID: fe61df83-c2a7-4653-8107-ffccda81cfc8
          Copyright © © 1993 S. Karger AG, Basel
          License:

          Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

          History
          Date received : 09 June 1992
          Date accepted : 06 November 1992
          Page count
          Pages: 9
          Categories
          Subject: Original Paper

          ScienceOpen disciplines: Vision sciences,Ophthalmology & Optometry,Pathology
          Keywords: Hemifield stimulation,Pattern reversal visual evoked response,Lower-field dominancy,Pattern reversal electroretinogram
          Data availability:
          ScienceOpen disciplines: Vision sciences, Ophthalmology & Optometry, Pathology
          Keywords: Hemifield stimulation, Pattern reversal visual evoked response, Lower-field dominancy, Pattern reversal electroretinogram

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