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| Research article summary (published 29 Apr 2002): |
Suppressive efficacies by adaptive temporal filtering system on photoparoxysmal response elicited by flickering pattern stimulation.
Full Abstract
PURPOSE:
Based on our previous study that validated efficacies of an adaptive temporal filtering system (ATFS) suppressing a photoparoxysmal response (PPR) elicited by a chromatic flicker stimulation, we further studied ATFS efficacies on PPRs elicited by pattern-flicker stimulation in 13 photosensitive epilepsy patients.
METHODS:
Subjects were 13 photosensitive epilepsy patients (two male and 11 female patients; mean age +/- SD, 20.9 +/- 8.9 years) who were all sensitive to a flickering geometric-pattern scene. We used a scene consisting of 15-Hz flickering 4 c/deg stripe images lasting for 4 s. With a 14-inch television set 2 m before a subject, we displayed the following video scenes:
nonfiltered and filtered flickering-stripe scenes; for the latter, two kinds of ATFSs with mild efficacy and strong efficacy were used. Three flickering-stripe scenes altogether, each of which lasted for 4 s, were given at random with a 10-s interval.
RESULTS:
A nonfiltered flickering-stripe scene elicited generalized PPRs in all patients; a filtered scene by use of an ATFS with mild efficacy elicited generalized PPRs in six patients (46%), whereas that by an ATFS with strong efficacy exhibited no PPRs.
CONCLUSIONS:
This study, using an ATFS, again shows suppressive efficacy on PPRs elicited by flickering-pattern stimulation. Therefore a series of our studies suggested that ATFS may be useful as a preventive measure for photosensitive seizures triggered by stimulative flickering images from televisions or other displays.
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Author information
Author/s: Takahashi, Takeo (T); Kamijo, Ken-ichi (K); Takaki, Yoko (Y); Yamazaki, Toshimasa (T);
Affiliation: Yaotome Clinic, Sendai, Japan. tt@dd.iij4u.or.jp
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't
Journal: Epilepsia (Epilepsia), published in United States. (Language: eng)
Reference: 2002-May; vol 43 (issue 5) : pp 530-4
Dates: Created 2002/05/24; Completed 2002/06/21; Revised 2006/11/15;
PMID: 12027915, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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