REF channels coming from intan headstages

[Sirenia Lizbeth MONDRAGON]

Hello,

 

I’m using the RHD2132 from Intan which has 2 REF pins connected on the board and 32 channels. I have one of those pins connected to a reference electrode and I would like to select this REF channel in the OE GUI using the channel Map plugin. The channel map window displays 35 channels, do you know which channels correspond to the ref pins? / How do I acess the ref channels coming from the intan headstage?

Thank you,

 

Best,

Lizbeth

[Phillip Baker]

Hi Sirenia,

Unlike in an analogue system, the reference channel on the digital head stage is utilized at the headstage itself and not sent on to the board. Therefore you can't get access to it to use it like a traditional analogue channel when selecting a reference channel. In fact, on the Intan headstage the ground and reference are connected via a 1 Ohm (low anyway) resistor so the act as the same thing. You can separate these by cutting the connection but I haven't seen any effect of doing this. The reasoning is that since the signal isn't traveling a long ways before digitization, there is no need to remove line noise as is the case in analogue systems. Reference electrodes on the Intan boards simply act as a high impedance contribution to the ground so I haven't really needed to use them. The common average reference has been my best bet to replace what I used to use as a reference in our old Neuralynx system.

Hope this helps!

[Sirenia Lizbeth MONDRAGON]

Hi Philip,

It makes sense, thank you very much for your detailed explanation.

Do you know what are channels 33-35 in this case? accelerometer outputs?

Thank you =)

Liz

[Phillip Baker]

Yes they are for the AUX pins on the headstage which may have an accelerometer on them.

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[Sirenia Lizbeth MONDRAGON]

Thank you!

Le mardi 13 juin 2017 20:11:34 UTC+2, Phillip Baker a écrit :

Yes they are for the AUX pins on the headstage which may have an accelerometer on them.

On Tue, Jun 13, 2017 at 9:23 AM, Sirenia Lizbeth MONDRAGON <sirenia....@gmail.com> wrote:

Hi Philip,

It makes sense, thank you very much for your detailed explanation.

Do you know what are channels 33-35 in this case? accelerometer outputs?

Thank you =)

Liz


Le mardi 13 juin 2017 17:26:21 UTC+2, Phillip Baker a écrit :

Hi Sirenia,

Unlike in an analogue system, the reference channel on the digital head stage is utilized at the headstage itself and not sent on to the board. Therefore you can't get access to it to use it like a traditional analogue channel when selecting a reference channel. In fact, on the Intan headstage the ground and reference are connected via a 1 Ohm (low anyway) resistor so the act as the same thing. You can separate these by cutting the connection but I haven't seen any effect of doing this. The reasoning is that since the signal isn't traveling a long ways before digitization, there is no need to remove line noise as is the case in analogue systems. Reference electrodes on the Intan boards simply act as a high impedance contribution to the ground so I haven't really needed to use them. The common average reference has been my best bet to replace what I used to use as a reference in our old Neuralynx system.

Hope this helps!

On Tuesday, June 13, 2017 at 8:11:06 AM UTC-7, Sirenia Lizbeth MONDRAGON wrote:

Hello,

 

I’m using the RHD2132 from Intan which has 2 REF pins connected on the board and 32 channels. I have one of those pins connected to a reference electrode and I would like to select this REF channel in the OE GUI using the channel Map plugin. The channel map window displays 35 channels, do you know which channels correspond to the ref pins? / How do I acess the ref channels coming from the intan headstage?

Thank you,

 

Best,

Lizbeth

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