Re: Review: Active electrodes

[Guest guest]

So I take it these don't work with the thought tech infinity encouders. I say this because i did not see them mentioned?

Bruce

Review: Active electrodes

Active EEG electrodes, which contain a pre-amplifier embedded in each electrode head to boost the signal before it ever reaches the amplifier, have long been one of the most attractive technologies in EEG from the point of view of the day-to-day trainer. They use snap-in disposable electrodes. No paste is required for any site without hair. There is no prep required anywhere. That's right: No scrubbing with NuPrep! Just clear the hair away from the scalp and place the electrodes with a dab of paste or use self-adhesives on areas without hair. When I started using active electrodes to do assessments, I shaved 10 minutes off my time! When you are done, wipe off paste with a paper towel or unsnap the self-adhesives and toss them away. No need to heat water, get out the q-tips and alcohol. Faster hookups, faster cleanups. And you get a zero-impedance signal--better than the best signal you can get by hand with scrubbing! What's not to like?!

Unforunately the only commercially avalable version of these electrodes gave us LOTS not to like. Brainquiry's ActivEEG electrodes were powered by a 9-volt battery that required changing by removing the back of the power box, shaking out the battery and prying it free of the battery cable (which invariably eventually pulled loose from the stress of changing batteries, creating irritating short-circuits). The power was turned on/off with a tiny slide switch that people without fingernails struggled to use. And the electrodes themselves were relatively short, meaning that you had to keep the power box in fairly close proximity to the head and the amplifier even closer. When they worked, they were great! Too often they didn't work or provided on-again-off-again signals. To get them fixed, you had to send them to the Netherlands and wait.I just finished testing the first available (to my knowledge) alternative to the ActivEEG's, and I feel like the promise of this technology has taken a giant step toward fulfillment. The Intellectrode power box is beautifully made and finished, smaller and sleeker and nicely designed. Like the ActivEEG, it has a belt clip on the back, but instead of placing the plugs on the front of the box, the Intellectrode has them on top, which makes much more sense if the client is wearing the box. Because each electrode plugs individually into the amplifier, you can use 3 if you are doing 1-channel training or 5 for 2-channel--and you can use a jumper.Gone is the 9-volt battery! It is replaced by an internal rechargeable lithium-ion battery and comes with a 110/240 volt recharger. No opening the case or prying the battery out. The battery is supposed to last for 2 days of training without recharge (though it would make more sense to recharge at the end of each training day). The unit comes with an extension with a 9-volt battery connector on it. The idea is that you can plug this into the power box for the actives and use it to power your 9-volt amplifier. This reportedly reduces the battery life to one day of training. This cable is relatively short, so using it means that the amplifier and active power box must be essentially in the same place.The on/off switch is pressed in (a green light goes on) to turn it on and pressed again to turn it off. You could do it (if you trained somewhere like, say, Minnesota) with gloves on, if you wanted to!The electrodes themselves have the heavier insulation used by ActivEEG's, but the Intellectrodes have also upgraded this part of the design: Instead of the finer wire about 4 inches long that ran from the power plug to the amplifier, the new electrodes have heavier leads a full 60 inches long, so you can reach the power box from the amplifier almost no matter where you put it. And the electrode head are on a heavier lead 36 inches long. They come with two yellow, two red and a black, so you can decide which color you want to use for active and which for reference electrodes and use black for the ground. Of course any electrode can plug into the power box in any input, since it only provides power.OK, you may have been toting this up in your head as you read: heavier electrode wire and more of it, better design, better switch, lithium-ion battery, recharger, 9-volt extension. What's this baby going to cost? The ActivEEG's run U$840 (plus the disposable electrode supply package). Brain-trainer.com now sells the Intellectrodes for $675--20% LESS than the ActivEEG's! If you already use disposable electrodes or have the disposables package for ActivEEG's, you can use them, of course, with the Intellectrodes.The box is warrantied for 1 year and the electrodes for 30 days. The only maintenence that should be required would be replacement of the Lithium Ion battery pack after a couple years.Active electrodes are one of those technologies that have the potential to transform the way you do neurofeedback, but, as we have learned more than once, the devil's in the details. With Intellectrodes it finally appears that someone has gotten the details right!You can see or order the Intellectrodes at http://www.brain-trainer.com/cgi-bin/shop.pl?shop=get_item & item_id=78Pete-- Van Deusenpvdtlcgmailhttp://www.brain-trainer.com305/433-3160The Learning Curve, Inc.

[Guest guest]

Thanks for the review, Pete!

Would the output of the Intellectrode box go to another EEG amp,

such as the QDS Focus, then to the computer or does it go directly

into the computer?

If it goes directly to the computer and bypasses the Focus, how

would you rate the quality of the signal as compared to using

standard electrodes through the QDS Focus?

Mike

>

> Active EEG electrodes, which contain a pre-amplifier embedded in

each

> electrode head to boost the signal before it ever reaches the

amplifier,

> have long been one of the most attractive technologies in EEG from

the point

> of view of the day-to-day trainer. They use snap-in disposable

electrodes.

> No paste is required for any site without hair. There is no prep

required

> anywhere. That's right: No scrubbing with NuPrep! Just clear the

hair away

> from the scalp and place the electrodes with a dab of paste or use

> self-adhesives on areas without hair. When I started using active

electrodes

> to do assessments, I shaved 10 minutes off my time! When you are

done, wipe

> off paste with a paper towel or unsnap the self-adhesives and toss

them

> away. No need to heat water, get out the q-tips and alcohol.

Faster

> hookups, faster cleanups. And you get a zero-impedance signal--

better than

> the best signal you can get by hand with scrubbing! What's not to

like?!

>

> Unforunately the only commercially avalable version of these

electrodes gave

> us LOTS not to like. Brainquiry's ActivEEG electrodes were

powered by a

> 9-volt battery that required changing by removing the back of the

power box,

> shaking out the battery and prying it free of the battery cable

(which

> invariably eventually pulled loose from the stress of changing

batteries,

> creating irritating short-circuits). The power was turned on/off

with a

> tiny slide switch that people without fingernails struggled to

use. And the

> electrodes themselves were relatively short, meaning that you had

to keep

> the power box in fairly close proximity to the head and the

amplifier even

> closer. When they worked, they were great! Too often they didn't

work or

> provided on-again-off-again signals. To get them fixed, you had

to send

> them to the Netherlands and wait.

>

> I just finished testing the first available (to my knowledge)

alternative to

> the ActivEEG's, and I feel like the promise of this technology has

taken a

> giant step toward fulfillment. The Intellectrode power box is

beautifully

> made and finished, smaller and sleeker and nicely designed. Like

the

> ActivEEG, it has a belt clip on the back, but instead of placing

the plugs

> on the front of the box, the Intellectrode has them on top, which

makes much

> more sense if the client is wearing the box. Because each

electrode plugs

> individually into the amplifier, you can use 3 if you are doing 1-

channel

> training or 5 for 2-channel--and you can use a jumper.

>

> Gone is the 9-volt battery! It is replaced by an internal

rechargeable

> lithium-ion battery and comes with a 110/240 volt recharger. No

opening the

> case or prying the battery out. The battery is supposed to last

for 2 days

> of training without recharge (though it would make more sense to

recharge at

> the end of each training day). The unit comes with an extension

with a

> 9-volt battery connector on it. The idea is that you can plug

this into the

> power box for the actives and use it to power your 9-volt

amplifier. This

> reportedly reduces the battery life to one day of training. This

cable is

> relatively short, so using it means that the amplifier and active

power box

> must be essentially in the same place.

>

> The on/off switch is pressed in (a green light goes on) to turn it

on and

> pressed again to turn it off. You could do it (if you trained

somewhere

> like, say, Minnesota) with gloves on, if you wanted to!

>

> The electrodes themselves have the heavier insulation used by

ActivEEG's,

> but the Intellectrodes have also upgraded this part of the

design: Instead

> of the finer wire about 4 inches long that ran from the power plug

to the

> amplifier, the new electrodes have heavier leads a full 60 inches

long, so

> you can reach the power box from the amplifier almost no matter

where you

> put it. And the electrode head are on a heavier lead 36 inches

long. They

> come with two yellow, two red and a black, so you can decide which

color you

> want to use for active and which for reference electrodes and use

black for

> the ground. Of course any electrode can plug into the power box

in any

> input, since it only provides power.

>

> OK, you may have been toting this up in your head as you read:

heavier

> electrode wire and more of it, better design, better switch,

lithium-ion

> battery, recharger, 9-volt extension. What's this baby going to

cost? The

> ActivEEG's run U$840 (plus the disposable electrode supply

package).

> Brain-trainer.com now sells the Intellectrodes for $675--20% LESS

than the

> ActivEEG's! If you already use disposable electrodes or have the

> disposables package for ActivEEG's, you can use them, of course,

with the

> Intellectrodes.

>

> The box is warrantied for 1 year and the electrodes for 30 days.

The only

> maintenence that should be required would be replacement of the

Lithium Ion

> battery pack after a couple years.

>

> Active electrodes are one of those technologies that have the

potential to

> transform the way you do neurofeedback, but, as we have learned

more than

> once, the devil's in the details. With Intellectrodes it finally

appears

> that someone has gotten the details right!

>

> You can see or order the Intellectrodes at

> http://www.brain-trainer.com/cgi-bin/shop.pl?

shop=get_item & item_id=78

>

> Pete

>

> --

> Van Deusen

> pvdtlc@...

> http://www.brain-trainer.com

> 305/433-3160

> The Learning Curve, Inc.

>

[Guest guest]

Thanks for the review, Pete!

Would the output of the Intellectrode box go to another EEG amp,

such as the QDS Focus, then to the computer or does it go directly

into the computer?

If it goes directly to the computer and bypasses the Focus, how

would you rate the quality of the signal as compared to using

standard electrodes through the QDS Focus?

Mike

>

> Active EEG electrodes, which contain a pre-amplifier embedded in

each

> electrode head to boost the signal before it ever reaches the

amplifier,

> have long been one of the most attractive technologies in EEG from

the point

> of view of the day-to-day trainer. They use snap-in disposable

electrodes.

> No paste is required for any site without hair. There is no prep

required

> anywhere. That's right: No scrubbing with NuPrep! Just clear the

hair away

> from the scalp and place the electrodes with a dab of paste or use

> self-adhesives on areas without hair. When I started using active

electrodes

> to do assessments, I shaved 10 minutes off my time! When you are

done, wipe

> off paste with a paper towel or unsnap the self-adhesives and toss

them

> away. No need to heat water, get out the q-tips and alcohol.

Faster

> hookups, faster cleanups. And you get a zero-impedance signal--

better than

> the best signal you can get by hand with scrubbing! What's not to

like?!

>

> Unforunately the only commercially avalable version of these

electrodes gave

> us LOTS not to like. Brainquiry's ActivEEG electrodes were

powered by a

> 9-volt battery that required changing by removing the back of the

power box,

> shaking out the battery and prying it free of the battery cable

(which

> invariably eventually pulled loose from the stress of changing

batteries,

> creating irritating short-circuits). The power was turned on/off

with a

> tiny slide switch that people without fingernails struggled to

use. And the

> electrodes themselves were relatively short, meaning that you had

to keep

> the power box in fairly close proximity to the head and the

amplifier even

> closer. When they worked, they were great! Too often they didn't

work or

> provided on-again-off-again signals. To get them fixed, you had

to send

> them to the Netherlands and wait.

>

> I just finished testing the first available (to my knowledge)

alternative to

> the ActivEEG's, and I feel like the promise of this technology has

taken a

> giant step toward fulfillment. The Intellectrode power box is

beautifully

> made and finished, smaller and sleeker and nicely designed. Like

the

> ActivEEG, it has a belt clip on the back, but instead of placing

the plugs

> on the front of the box, the Intellectrode has them on top, which

makes much

> more sense if the client is wearing the box. Because each

electrode plugs

> individually into the amplifier, you can use 3 if you are doing 1-

channel

> training or 5 for 2-channel--and you can use a jumper.

>

> Gone is the 9-volt battery! It is replaced by an internal

rechargeable

> lithium-ion battery and comes with a 110/240 volt recharger. No

opening the

> case or prying the battery out. The battery is supposed to last

for 2 days

> of training without recharge (though it would make more sense to

recharge at

> the end of each training day). The unit comes with an extension

with a

> 9-volt battery connector on it. The idea is that you can plug

this into the

> power box for the actives and use it to power your 9-volt

amplifier. This

> reportedly reduces the battery life to one day of training. This

cable is

> relatively short, so using it means that the amplifier and active

power box

> must be essentially in the same place.

>

> The on/off switch is pressed in (a green light goes on) to turn it

on and

> pressed again to turn it off. You could do it (if you trained

somewhere

> like, say, Minnesota) with gloves on, if you wanted to!

>

> The electrodes themselves have the heavier insulation used by

ActivEEG's,

> but the Intellectrodes have also upgraded this part of the

design: Instead

> of the finer wire about 4 inches long that ran from the power plug

to the

> amplifier, the new electrodes have heavier leads a full 60 inches

long, so

> you can reach the power box from the amplifier almost no matter

where you

> put it. And the electrode head are on a heavier lead 36 inches

long. They

> come with two yellow, two red and a black, so you can decide which

color you

> want to use for active and which for reference electrodes and use

black for

> the ground. Of course any electrode can plug into the power box

in any

> input, since it only provides power.

>

> OK, you may have been toting this up in your head as you read:

heavier

> electrode wire and more of it, better design, better switch,

lithium-ion

> battery, recharger, 9-volt extension. What's this baby going to

cost? The

> ActivEEG's run U$840 (plus the disposable electrode supply

package).

> Brain-trainer.com now sells the Intellectrodes for $675--20% LESS

than the

> ActivEEG's! If you already use disposable electrodes or have the

> disposables package for ActivEEG's, you can use them, of course,

with the

> Intellectrodes.

>

> The box is warrantied for 1 year and the electrodes for 30 days.

The only

> maintenence that should be required would be replacement of the

Lithium Ion

> battery pack after a couple years.

>

> Active electrodes are one of those technologies that have the

potential to

> transform the way you do neurofeedback, but, as we have learned

more than

> once, the devil's in the details. With Intellectrodes it finally

appears

> that someone has gotten the details right!

>

> You can see or order the Intellectrodes at

> http://www.brain-trainer.com/cgi-bin/shop.pl?

shop=get_item & item_id=78

>

> Pete

>

> --

> Van Deusen

> pvdtlc@...

> http://www.brain-trainer.com

> 305/433-3160

> The Learning Curve, Inc.

>

[Guest guest]

Mike,You plug any electrodes into the amplifier. The actives simply have a power plug inserted along the length of the electrode cable so they can be powered. Otherwise, they are like any other electrode: head on one end that goes on the scalp (via a snap-in electrode), DIN plug on the other end that plugs into the appropriate plug on the amplifier.

Pete-- Van Deusenpvdtlc@...http://www.brain-trainer.com305/433-3160The Learning Curve, Inc.

Thanks for the review, Pete!

Would the output of the Intellectrode box go to another EEG amp,

such as the QDS Focus, then to the computer or does it go directly

into the computer?

If it goes directly to the computer and bypasses the Focus, how

would you rate the quality of the signal as compared to using

standard electrodes through the QDS Focus?

[Guest guest]

Mike,You plug any electrodes into the amplifier. The actives simply have a power plug inserted along the length of the electrode cable so they can be powered. Otherwise, they are like any other electrode: head on one end that goes on the scalp (via a snap-in electrode), DIN plug on the other end that plugs into the appropriate plug on the amplifier.

Pete-- Van Deusenpvdtlc@...http://www.brain-trainer.com305/433-3160The Learning Curve, Inc.

Thanks for the review, Pete!

Would the output of the Intellectrode box go to another EEG amp,

such as the QDS Focus, then to the computer or does it go directly

into the computer?

If it goes directly to the computer and bypasses the Focus, how

would you rate the quality of the signal as compared to using

standard electrodes through the QDS Focus?

[Guest guest]

Thanks! I get I understand the set up now. Does eliminating

impedance issues also take care of EMF interference? Are they one

and the same? Mike

>

> > Thanks for the review, Pete!

> >

> > Would the output of the Intellectrode box go to another EEG amp,

> > such as the QDS Focus, then to the computer or does it go

directly

> > into the computer?

> >

> > If it goes directly to the computer and bypasses the Focus, how

> > would you rate the quality of the signal as compared to using

> > standard electrodes through the QDS Focus?

> >

>

[Guest guest]

Mike,The higher the impedance, the more " static " the signal contains, and the easier it is for background noise to enter. Perfect impedance means that you are tuned dead-center on the station you want to hear (the EEG signal.) However, even a perfect connection won't remove eyeblink or EMG artifact, nor will it clean up the signal if you are using ungrounded power sources, etc.

Although you may still see noise at 60 Hz, if you have a zero impedance signal you can still train and get excellent results, since the 60Hz signal doesn't produce " sub-harmonics " that mess up readings in the training range.

Pete-- Van Deusenpvdtlc@...http://www.brain-trainer.com305/433-3160The Learning Curve, Inc.

Thanks! I get I understand the set up now. Does eliminating

impedance issues also take care of EMF interference? Are they one

and the same? Mike

[Guest guest]

Bruce,This message responding to Liz yesterday specifically answers her question about use with Infiniti encoders:http://health.groups.yahoo.com/group/braintrainer/message/24569

-- Van Deusenpvdtlc@...http://www.brain-trainer.com305/433-3160The Learning Curve, Inc.

So I take it these don't work with the thought tech infinity encouders. I say this because i did not see them mentioned?

Bruce

[Guest guest]

Bruce,I'm assuming that they do. Liz

So I take it these don't work with the thought tech infinity encouders. I say this because i did not see them mentioned?

Bruce

Review: Active electrodes

Active EEG electrodes, which contain a pre-amplifier embedded in each electrode head to boost the signal before it ever reaches the amplifier, have long been one of the most attractive technologies in EEG from the point of view of the day-to-day trainer. They use snap-in disposable electrodes. No paste is required for any site without hair. There is no prep required anywhere. That's right: No scrubbing with NuPrep! Just clear the hair away from the scalp and place the electrodes with a dab of paste or use self-adhesives on areas without hair. When I started using active electrodes to do assessments, I shaved 10 minutes off my time! When you are done, wipe off paste with a paper towel or unsnap the self-adhesives and toss them away. No need to heat water, get out the q-tips and alcohol. Faster hookups, faster cleanups. And you get a zero-impedance signal--better than the best signal you can get by hand with scrubbing! What's not to like?!

Unforunately the only commercially avalable version of these electrodes gave us LOTS not to like. Brainquiry's ActivEEG electrodes were powered by a 9-volt battery that required changing by removing the back of the power box, shaking out the battery and prying it free of the battery cable (which invariably eventually pulled loose from the stress of changing batteries, creating irritating short-circuits). The power was turned on/off with a tiny slide switch that people without fingernails struggled to use. And the electrodes themselves were relatively short, meaning that you had to keep the power box in fairly close proximity to the head and the amplifier even closer. When they worked, they were great! Too often they didn't work or provided on-again-off-again signals. To get them fixed, you had to send them to the Netherlands and wait.I just finished testing the first available (to my knowledge) alternative to the ActivEEG's, and I feel like the promise of this technology has taken a giant step toward fulfillment. The Intellectrode power box is beautifully made and finished, smaller and sleeker and nicely designed. Like the ActivEEG, it has a belt clip on the back, but instead of placing the plugs on the front of the box, the Intellectrode has them on top, which makes much more sense if the client is wearing the box. Because each electrode plugs individually into the amplifier, you can use 3 if you are doing 1-channel training or 5 for 2-channel--and you can use a jumper.Gone is the 9-volt battery! It is replaced by an internal rechargeable lithium-ion battery and comes with a 110/240 volt recharger. No opening the case or prying the battery out. The battery is supposed to last for 2 days of training without recharge (though it would make more sense to recharge at the end of each training day). The unit comes with an extension with a 9-volt battery connector on it. The idea is that you can plug this into the power box for the actives and use it to power your 9-volt amplifier. This reportedly reduces the battery life to one day of training. This cable is relatively short, so using it means that the amplifier and active power box must be essentially in the same place.The on/off switch is pressed in (a green light goes on) to turn it on and pressed again to turn it off. You could do it (if you trained somewhere like, say, Minnesota) with gloves on, if you wanted to!The electrodes themselves have the heavier insulation used by ActivEEG's, but the Intellectrodes have also upgraded this part of the design: Instead of the finer wire about 4 inches long that ran from the power plug to the amplifier, the new electrodes have heavier leads a full 60 inches long, so you can reach the power box from the amplifier almost no matter where you put it. And the electrode head are on a heavier lead 36 inches long. They come with two yellow, two red and a black, so you can decide which color you want to use for active and which for reference electrodes and use black for the ground. Of course any electrode can plug into the power box in any input, since it only provides power.OK, you may have been toting this up in your head as you read: heavier electrode wire and more of it, better design, better switch, lithium-ion battery, recharger, 9-volt extension. What's this baby going to cost? The ActivEEG's run U$840 (plus the disposable electrode supply package). Brain-trainer.com now sells the Intellectrodes for $675--20% LESS than the ActivEEG's! If you already use disposable electrodes or have the disposables package for ActivEEG's, you can use them, of course, with the Intellectrodes.The box is warrantied for 1 year and the electrodes for 30 days. The only maintenence that should be required would be replacement of the Lithium Ion battery pack after a couple years.Active electrodes are one of those technologies that have the potential to transform the way you do neurofeedback, but, as we have learned more than once, the devil's in the details. With Intellectrodes it finally appears that someone has gotten the details right!You can see or order the Intellectrodes at http://www.brain-trainer.com/cgi-bin/shop.pl?shop=get_item & item_id=78Pete

-- Van Deusenpvdtlc@...http://www.brain-trainer.com305/433-3160

The Learning Curve, Inc.

[Guest guest]

Bruce,I'm assuming that they do. Liz

So I take it these don't work with the thought tech infinity encouders. I say this because i did not see them mentioned?

Bruce

Review: Active electrodes

Active EEG electrodes, which contain a pre-amplifier embedded in each electrode head to boost the signal before it ever reaches the amplifier, have long been one of the most attractive technologies in EEG from the point of view of the day-to-day trainer. They use snap-in disposable electrodes. No paste is required for any site without hair. There is no prep required anywhere. That's right: No scrubbing with NuPrep! Just clear the hair away from the scalp and place the electrodes with a dab of paste or use self-adhesives on areas without hair. When I started using active electrodes to do assessments, I shaved 10 minutes off my time! When you are done, wipe off paste with a paper towel or unsnap the self-adhesives and toss them away. No need to heat water, get out the q-tips and alcohol. Faster hookups, faster cleanups. And you get a zero-impedance signal--better than the best signal you can get by hand with scrubbing! What's not to like?!

Unforunately the only commercially avalable version of these electrodes gave us LOTS not to like. Brainquiry's ActivEEG electrodes were powered by a 9-volt battery that required changing by removing the back of the power box, shaking out the battery and prying it free of the battery cable (which invariably eventually pulled loose from the stress of changing batteries, creating irritating short-circuits). The power was turned on/off with a tiny slide switch that people without fingernails struggled to use. And the electrodes themselves were relatively short, meaning that you had to keep the power box in fairly close proximity to the head and the amplifier even closer. When they worked, they were great! Too often they didn't work or provided on-again-off-again signals. To get them fixed, you had to send them to the Netherlands and wait.I just finished testing the first available (to my knowledge) alternative to the ActivEEG's, and I feel like the promise of this technology has taken a giant step toward fulfillment. The Intellectrode power box is beautifully made and finished, smaller and sleeker and nicely designed. Like the ActivEEG, it has a belt clip on the back, but instead of placing the plugs on the front of the box, the Intellectrode has them on top, which makes much more sense if the client is wearing the box. Because each electrode plugs individually into the amplifier, you can use 3 if you are doing 1-channel training or 5 for 2-channel--and you can use a jumper.Gone is the 9-volt battery! It is replaced by an internal rechargeable lithium-ion battery and comes with a 110/240 volt recharger. No opening the case or prying the battery out. The battery is supposed to last for 2 days of training without recharge (though it would make more sense to recharge at the end of each training day). The unit comes with an extension with a 9-volt battery connector on it. The idea is that you can plug this into the power box for the actives and use it to power your 9-volt amplifier. This reportedly reduces the battery life to one day of training. This cable is relatively short, so using it means that the amplifier and active power box must be essentially in the same place.The on/off switch is pressed in (a green light goes on) to turn it on and pressed again to turn it off. You could do it (if you trained somewhere like, say, Minnesota) with gloves on, if you wanted to!The electrodes themselves have the heavier insulation used by ActivEEG's, but the Intellectrodes have also upgraded this part of the design: Instead of the finer wire about 4 inches long that ran from the power plug to the amplifier, the new electrodes have heavier leads a full 60 inches long, so you can reach the power box from the amplifier almost no matter where you put it. And the electrode head are on a heavier lead 36 inches long. They come with two yellow, two red and a black, so you can decide which color you want to use for active and which for reference electrodes and use black for the ground. Of course any electrode can plug into the power box in any input, since it only provides power.OK, you may have been toting this up in your head as you read: heavier electrode wire and more of it, better design, better switch, lithium-ion battery, recharger, 9-volt extension. What's this baby going to cost? The ActivEEG's run U$840 (plus the disposable electrode supply package). Brain-trainer.com now sells the Intellectrodes for $675--20% LESS than the ActivEEG's! If you already use disposable electrodes or have the disposables package for ActivEEG's, you can use them, of course, with the Intellectrodes.The box is warrantied for 1 year and the electrodes for 30 days. The only maintenence that should be required would be replacement of the Lithium Ion battery pack after a couple years.Active electrodes are one of those technologies that have the potential to transform the way you do neurofeedback, but, as we have learned more than once, the devil's in the details. With Intellectrodes it finally appears that someone has gotten the details right!You can see or order the Intellectrodes at http://www.brain-trainer.com/cgi-bin/shop.pl?shop=get_item & item_id=78Pete

-- Van Deusenpvdtlc@...http://www.brain-trainer.com305/433-3160

The Learning Curve, Inc.