Mind Alive Blog
Tuesday, February 16, 2010
AVE and Seizures
Sometimes we have questions about the possibility of AVE producing seizures, so I thought it would be a good idea to address this topic.
Roughly 1 in 10,000 adults and 1 in 4,000 children could have photic induced seizures. To induce seizures, neurologists use photic stimulators with Xenon strobe lights that flash very suddenly, usually within 50 microseconds at intensities of 10,000 to 300,000 lux. Several researchers have found that red-flicker light provokes an increased risk of photo-convulsive response (PCR) relative to other color wavelengths. It has been further found that the peak PCR occurs from red-light, square-wave stimulation (instant on - instant off) in the 15 to 20 Hz range. Ruuskanen-Uoti (1994) reported on a person who developed seizures while using a “light and sound” machine utilizing square wave stimulation delivered by red light emitting diodes (LEDs). However, it has been found that low levels of blue light will inhibit a seizure in the making.
In addition to increasing the chance of seizure, square wave light stimulation also generates odd harmonics in the brain. Therefore, when stimulating at 10 Hz, in the hopes of inducing meditation, a 30 Hz harmonic can be generated within the brain and trigger an anxiety/panic reaction in some people. This is why we use sine wave entrainment for frequencies at 10 Hz and lower – to actually induce meditation that the user wants – not anxiety. We don’t use square wave stimulation in any of our sessions (although it is possible to use in a user defined session with the Session Editor). Most other light and sound devices use square wave entrainment, as square waves are easy to make.
About 8% of those with a history of natural (non-photic) seizure are also photo-epileptic. Care must be taken when delivering photic stimulation, particularly to children. However, we have seen anecdotes where alpha (10 Hz) and/or SMR (14Hz) have settled down seizure quite a bit. When using visual entrainment (VE) to treat seizure, it must be done under the supervision of a qualified health-care professional with EEG monitoring. Typically, the spike-and-wave activity associated with seizure can be observed on the EEG before physical symptoms become apparent and the session can be stopped.
Auditory entrainment (AE) is a safe alternative for people who have a history of seizures or believe that they might be susceptible to seizures using photic entrainment. AE (using the pulsed sounds only) does entrain brain waves, but is not as powerful as visual and auditory entrainment combined. Firstly, there are over 1,000,000 incoming nerve fibres from each eye and about 10,000 incoming nerves from each ear. This huge difference between eye and ear input contributes to the reasons why VE can cause seizure while auditory entrainment is safe. A study by Frederick (1999) found that AE at 18 Hz (the only frequency they tested) increased brain activity by 21% whereas VE entrainment increased brain activity by 49% when measured at the vertex (top of head).
So, although VE is extremely effective, there is sometimes a need for caution; whereas AE, although less effective, is a very safe option.
We have an article on our web site with more information on the safety of using AVE and seizures. I would invite you to go to: www.mindalive.com/1_0/article%208.pdf.
It is great to see comments starting to come in to our blog! Thanks, all!
Dave Siever
- dancing in the dendrites!
Roughly 1 in 10,000 adults and 1 in 4,000 children could have photic induced seizures. To induce seizures, neurologists use photic stimulators with Xenon strobe lights that flash very suddenly, usually within 50 microseconds at intensities of 10,000 to 300,000 lux. Several researchers have found that red-flicker light provokes an increased risk of photo-convulsive response (PCR) relative to other color wavelengths. It has been further found that the peak PCR occurs from red-light, square-wave stimulation (instant on - instant off) in the 15 to 20 Hz range. Ruuskanen-Uoti (1994) reported on a person who developed seizures while using a “light and sound” machine utilizing square wave stimulation delivered by red light emitting diodes (LEDs). However, it has been found that low levels of blue light will inhibit a seizure in the making.
In addition to increasing the chance of seizure, square wave light stimulation also generates odd harmonics in the brain. Therefore, when stimulating at 10 Hz, in the hopes of inducing meditation, a 30 Hz harmonic can be generated within the brain and trigger an anxiety/panic reaction in some people. This is why we use sine wave entrainment for frequencies at 10 Hz and lower – to actually induce meditation that the user wants – not anxiety. We don’t use square wave stimulation in any of our sessions (although it is possible to use in a user defined session with the Session Editor). Most other light and sound devices use square wave entrainment, as square waves are easy to make.
About 8% of those with a history of natural (non-photic) seizure are also photo-epileptic. Care must be taken when delivering photic stimulation, particularly to children. However, we have seen anecdotes where alpha (10 Hz) and/or SMR (14Hz) have settled down seizure quite a bit. When using visual entrainment (VE) to treat seizure, it must be done under the supervision of a qualified health-care professional with EEG monitoring. Typically, the spike-and-wave activity associated with seizure can be observed on the EEG before physical symptoms become apparent and the session can be stopped.
Auditory entrainment (AE) is a safe alternative for people who have a history of seizures or believe that they might be susceptible to seizures using photic entrainment. AE (using the pulsed sounds only) does entrain brain waves, but is not as powerful as visual and auditory entrainment combined. Firstly, there are over 1,000,000 incoming nerve fibres from each eye and about 10,000 incoming nerves from each ear. This huge difference between eye and ear input contributes to the reasons why VE can cause seizure while auditory entrainment is safe. A study by Frederick (1999) found that AE at 18 Hz (the only frequency they tested) increased brain activity by 21% whereas VE entrainment increased brain activity by 49% when measured at the vertex (top of head).
So, although VE is extremely effective, there is sometimes a need for caution; whereas AE, although less effective, is a very safe option.
We have an article on our web site with more information on the safety of using AVE and seizures. I would invite you to go to: www.mindalive.com/1_0/article%208.pdf.
It is great to see comments starting to come in to our blog! Thanks, all!
Dave Siever
- dancing in the dendrites!
Labels: Seizures
Comments:
Thanks for sharing this.,
Leanpitch provides online training in Build mvp without code ,everyone can use it wisely.
Build mvp without code
no code mvp
<< Home
Thanks for sharing this informative content.,
Leanpitch provides online training in Scrum Master Certification during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
Scrum master certification online
CSM certification online
Leanpitch provides online training in Scrum Master Certification during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
Scrum master certification online
CSM certification online
Thanks for sharing this informative content.,
Leanpitch provides online training in Scrum Master Certification during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
CSM online
CSM online certification
Leanpitch provides online training in Scrum Master Certification during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
CSM online
CSM online certification
Thanks for sharing this informative content.,
Leanpitch provides online training in Scrum Master Certification during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
CSM online training
CSM training online
Leanpitch provides online training in Scrum Master Certification during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
CSM online training
CSM training online
Thanks for sharing this informative content.,
Leanpitch provides online training in Agile team facilitation during this lockdown period everyone can use it wisely.
Agile team facilitation
ICP ATF
Team facilitator Agile
Agile facilitator
Team facilitator in Agile
ICAGILE ATF
Leanpitch provides online training in Agile team facilitation during this lockdown period everyone can use it wisely.
Agile team facilitation
ICP ATF
Team facilitator Agile
Agile facilitator
Team facilitator in Agile
ICAGILE ATF
Thanks for sharing this.,
Leanpitch provides online training in Scrum Master during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
Scrum master certification
csm certification
Leanpitch provides online training in Scrum Master during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
Scrum master certification
csm certification
Thanks for sharing this.,
Leanpitch provides online training in Scrum Master during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
certified scrum master certification
Scrum master Training
Leanpitch provides online training in Scrum Master during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
certified scrum master certification
Scrum master Training
Thanks for sharing this.,
Leanpitch provides online training in Scrum Master during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
agile scrum master certification
Scrum master certification
Leanpitch provides online training in Scrum Master during this lockdown period everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
agile scrum master certification
Scrum master certification
Thanks for sharing this.,
Leanpitch provides online training in Build mvp without code ,everyone can use it wisely.
Build mvp without code
no code mvp
Thanks for sharing this informative content.,
Leanpitch provides online training in Agile team facilitation ,everyone can use it wisely.
Agile team facilitation
ICAGILE ATF
Leanpitch provides online training in Agile team facilitation ,everyone can use it wisely.
Agile team facilitation
ICAGILE ATF
Thanks for sharing this informative content.,
Leanpitch provides online training in Agile team facilitation ,everyone can use it wisely.
ICP ATF
Agile facilitator
Leanpitch provides online training in Agile team facilitation ,everyone can use it wisely.
ICP ATF
Agile facilitator
Thanks for sharing this informative content.,
Leanpitch provides online training in Agile team facilitation ,everyone can use it wisely.
Team facilitator in Agile
ICP ATF
Leanpitch provides online training in Agile team facilitation ,everyone can use it wisely.
Team facilitator in Agile
ICP ATF
Thanks for sharing this informative content.,
Leanpitch provides online training in Scrum Master Certification , everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
CSM online certification
Scrum master training online
Leanpitch provides online training in Scrum Master Certification , everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
CSM online certification
Scrum master training online
Thanks for sharing this informative content.,
Leanpitch provides online training in Scrum Master Certification , everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
Scrum master certification online
CSM certification online
Leanpitch provides online training in Scrum Master Certification , everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
Scrum master certification online
CSM certification online
Thanks for sharing this informative content.,
Leanpitch provides online training in Scrum Master Certification , everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
CSM online
CSM online certification
Leanpitch provides online training in Scrum Master Certification , everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
CSM online
CSM online certification
Thanks for sharing this.,
Leanpitch provides online training in Scrum Master, everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
csm training
Scrum master Training
Leanpitch provides online training in Scrum Master, everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
csm training
Scrum master Training
Thanks for sharing this.,
Leanpitch provides online training in Scrum Master, everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
certified scrum master certification
agile scrum master certification
Leanpitch provides online training in Scrum Master, everyone can use it wisely.
Join Leanpitch 2 Days CSM Certification Workshop in different cities.
certified scrum master certification
agile scrum master certification
Great job on this post! It was very informative and helpful. I appreciate the effort you put into researching and writing this article. Your post has successfully explained the topic in a clear and concise manner. This post made me think about the topic in a different way.
playa de virginia manual de divorcio sin oposición
playa de virginia manual de divorcio sin oposición
Subscribe to Post Comments [Atom]
<< Home
Post a Comment