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julienConscious

julienConscious

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julienConscious
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Paris
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  • Hi George3d6, the first before the last pic looks decent for channels 1,2 7, 8 and possibly 5. This is probably the right settings. Contact of the sensors with the scalp (through hair?) on channels 3,4 and 6 is probably wrong and needs to be readj…
  • Hi Abdullah, it could be a Gain problem. Did you set it to X8 in the Hardware settings? If you keep the default X24 Gain, together with the ear clips, the offset is too high and most channels get saturated. Include bias, make sure the settings are …
  • Hi Hiro, if you do not have gold cups, no need to buy them. The idea was just to come back to a configuration that you knew and that was working well to discard any other issues. If you have other electrodes like sticky pads for instance, you can a…
  • Hi Hiro, just reading your messages (thanks William for the notification!). Regarding bias, you can totally include the bias in your settings, that is how we use the ThinkPulse at Conscious Labs, it really helps get a better signal. Regarding the…
  • Hi George3d6, indeed abnormal signal. I suggest you refer to tutorial video numer 4 "Cable management and connection guide" on the OpenBCI ThinkPulse documentation page. Here's a screenshot from it, all the connections are explained However, I …
  • Hi George3d6, thanks for the pictures that will help clarify. The ring is the rigid plastic part that touches your thumb in the first pic whereas the casing is the joint ball rigid plastic part that you hold in the second pic: These parts are no…
  • Hi George3d6, I understand you initially bought the starter kit (that comes with the short prongs, and also flat electrode design for forehead/bare skin already installed into the joint ball sensor casing), and that you also bought the replacement …
  • Hi Everyone, sounds like good suggestions indeed. You can also try to deactivate all sensors except pre frontal Fp1 / Fp2 with flat electrodes on the forehead (they are the easiest to get clean and also you can check blinking). Make sure you get a…
  • Hi Jim, that was the answer I wanted to post. With Gain=24, you are limited to +/-187 500 microV voltage input range. Good job in finding out. You have fairly normal DC offset values especially with using earclips. We recommend Gain=8 on the tutori…
  • Hi Jim @evolution_encoded, thanks William @wjcroft for keeping the threads organized and consistent. If we dismiss any defective sensor and/or wires or connection problems, the most likely reason inmy opinion is saturation. I do not know exactly …
  • Hi Jim @evolution_encoded, as you know, ThinkPulse sensors use the standard Dupont connectors to be compatible with OpenBCI Cyton board. Each sensor has 3 wires: power +, power - and signal. You can just use standard jumper wires with male/female D…
  • Hi @anto, althouth the ThinkPulse Starter Kit for OpenBCI is meant to be used with OpenBCI Cyton/Daisy boards, the sensors can be used with other amps providing the setting is similar and the right power supply and the right connections are provide…
  • Hi everyone, thanks William as usual for organizing the discussions in the forum and for including the people that might be interested in participating in the discussion. Thanks Etc for your interest in BCI and for spending time testing our tech. …
  • Hi Tim, William, signal looks very noisy indeed, slightly better in the last image (except for one or 2 noticeable channels). Looks like the Y scale is roughly 10 microV so this is a decent amplitude. What's unusual is that there is a pulsating noi…
  • Hi @Jason, thanks for your message and the detailed description of your experiment. We indeed have successful P300 experiments protocoles with ThinkPulse, sorry to hear it did not work for you. What you did for verification makes complete sense. H…
  • Hi Lucas, Really cool experiment, it looks like a lot of fun ! Thanks for sharing. Julien
  • Hi Lucas, so I was curious, we made some quick experiments. Here is the spectrum for O2 with a blinking at 7Hz: and the spectrum still for 02 with a blinking at 11Hz: Both recordings were done using the ThinkPulse active sensors over 20s (I…
  • Hi Lucas, thanks for images and for the explanations. Your experiment looks great and indeed you can see a very nice peak with the gel electrodes. I'm confident you can achieve similar results with the dry electrodes but it might require some adjus…
  • Hi everyone, it is possible to use dry electrodes for SSVEP. Hard to tell what's wrong here: the most common issue is that the hardware parameters are not correctly applied, as @retiutut mentioned it is sometimes tricky, especially if you stream th…
  • Thanks Lucas for the info: let us know about your further tests! Best Julien
  • Hi Pietro, you can activate and use the BIAS electrode while using ThinkPulse sensors, we do it on a regular basis and it works fine. BIAS usually makes the signal more stable, limits offset and 50/60Hz noise. There might be specific situations whe…
  • Hi Everyone, as mentioned in PM to Lucas, in theory the input voltage 0-3V provided by Ganglion is compatible with the amp used in TP sensors but we have not performed a test to validate that. It is on our to-do list tho, since we would like Gangli…
  • Hi Alex, William, yes it is definitely possible to use ThinkPulse electrodes with Cyton + Wifishield. We have successfully tested that configuration and even Cyton+Daisy+Wifishield (with the pack or a LiPo battery). Each TP electrode uses under 1mA…
  • Hi Yunda, Hi all, As William mentioned, ThinkPulse are active sensors. It means that right behind the electrode, there is a local active circuit which is a voltage follower. When you want to measure electrode-to-skin impedance, you typically conn…
  • Hi Daniel, regarding your observations: * Mechanical design: We designed the ThinkPulse so it does not change the geometry of the original set-up. Both the [Octanut + normal passive electrode] and the [Octanut + ThinkPulse] are 42mm long (top …
  • Hi all, @wjcroft As you said, if you do the experiment that you suggest with an extra passive electrode, there should not be any difference. There is no voltage amplification with the ThinkPulse active sensors: the active circuit only boosts t…
  • Hi all, thanks William for your suggestion: Daniel contacted us indeed using the form on our website, I replied with a few basic tests. High gain is probably the reason why it's railed: when using ThinkPulse active sensors with original ear clips …