RE: Photo Sensitive Epilepsy. (PSE)
I assisted in developing a tester for brain damage a long time ago. The device created flicker at various rates and the rate was lowered until the patient first noted the flicker. It seems that a person with brain damage is able to notice flicker at a higher rate than a healthy person. Richard Woods -Original Message- From: Nick Williams [mailto:nick.willi...@conformance.co.uk] Sent: Tuesday, September 25, 2001 4:17 PM To: Crabb, John Cc: emc-p...@majordomo.ieee.org Subject: Re: Photo Sensitive Epilepsy. (PSE) John, I can't answer your question directly, but we did some research into PSE just over a year ago, and were told the following by a consultant pediatric neurologist at Sheffield children's hospital: - Teenagers and adolescents are most susceptible. - Small percentage of people susceptible, effect can vary from funny feeling to trance or seizure which subsides when stimulus is removed - There is no lasting damage from such an episode, there is no causal link to full epilepsy. - Greatest danger is from falling over or onto objects during seizure - More likely in low background light levels. - Closing one eye reduces effect this can be useful preventive measure for sufferers knowing of condition - Distress could be caused to observers I also have a word document with a summary of the replies I received when I made a similar enquiry to this mailing list at the time. Please let me know if you'd like me to send it to you. Nick. At 16:03 +0100 25/9/2001, Crabb, John wrote: Would anyone have any guidelines on how to design computer graphics in such a way to avoid inducing Photo Sensitive Epilepsy in anyone who suffers from that complaint ? Regards, John Crabb, Development Excellence (Product Safety) , NCR Financial Solutions Group Ltd., Kingsway West, Dundee, Scotland. DD2 3XX E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. VoicePlus 6-341-2289. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Photo Sensitive Epilepsy. (PSE)
John, I can't answer your question directly, but we did some research into PSE just over a year ago, and were told the following by a consultant pediatric neurologist at Sheffield children's hospital: - Teenagers and adolescents are most susceptible. - Small percentage of people susceptible, effect can vary from funny feeling to trance or seizure which subsides when stimulus is removed - There is no lasting damage from such an episode, there is no causal link to full epilepsy. - Greatest danger is from falling over or onto objects during seizure - More likely in low background light levels. - Closing one eye reduces effect this can be useful preventive measure for sufferers knowing of condition - Distress could be caused to observers I also have a word document with a summary of the replies I received when I made a similar enquiry to this mailing list at the time. Please let me know if you'd like me to send it to you. Nick. At 16:03 +0100 25/9/2001, Crabb, John wrote: Would anyone have any guidelines on how to design computer graphics in such a way to avoid inducing Photo Sensitive Epilepsy in anyone who suffers from that complaint ? Regards, John Crabb, Development Excellence (Product Safety) , NCR Financial Solutions Group Ltd., Kingsway West, Dundee, Scotland. DD2 3XX E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. VoicePlus 6-341-2289. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Photo Sensitive Epilepsy. (PSE)
Hi John C. and John W.: Would anyone have any guidelines on how to design computer graphics in such a way to avoid inducing Photo Sensitive Epilepsy in anyone who suffers from that complaint ? .. .. .. A web search for 'epilepsy AND photosensitivity' will probably give you more information that you will ever need. I did this (photosensitive epilepsy) and did indeed find more information than I would ever need. I did find a very informative site that seems to answer John C's questions. See: http://www.epilepsytoronto.org/people/eaupdate/vol9-3.html Interestingly, the flicker rate of computer displays is not considered provacative in terms of photosensitive epilepsy. However, the article does discuss the effects of spatial contrast in a display, whether TV or computer. Best regards, Rich --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Re: Photo Sensitive Epilepsy. (PSE)
I read in !emc-pstc that Crabb, John jo...@exchange.scotland.ncr.com wrote (in B6CD5947CF30D411A1350050DA4B75FF03C232D9@sgbdun200.scotland.n cr.com) about 'Photo Sensitive Epilepsy. (PSE)', on Tue, 25 Sep 2001: Would anyone have any guidelines on how to design computer graphics in such a way to avoid inducing Photo Sensitive Epilepsy in anyone who suffers from that complaint ? Avoid sudden changes of screen brightness, especially flashing with repetition rates between two frequencies that I'd rather not state, because opinions differ. Avoid moving vortex patterns too, AIUI. A web search for 'epilepsy AND photosensitivity' will probably give you more information that you will ever need. -- Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk Eat mink and be dreary! --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
Photo Sensitive Epilepsy. (PSE)
Would anyone have any guidelines on how to design computer graphics in such a way to avoid inducing Photo Sensitive Epilepsy in anyone who suffers from that complaint ? Regards, John Crabb, Development Excellence (Product Safety) , NCR Financial Solutions Group Ltd., Kingsway West, Dundee, Scotland. DD2 3XX E-Mail :john.cr...@scotland.ncr.com Tel: +44 (0)1382-592289 (direct ). Fax +44 (0)1382-622243. VoicePlus 6-341-2289. --- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson:pstc_ad...@garretson.org Dave Healddavehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
