eegstud24
eegstud24
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- eegstud24
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- Williamsburg, VA
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- Location
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Comments
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Hi William! Thanks for the links and for helping me brainstorm. Also, let me clarify: my advisor wants to analyze the data offline in EEGLab since he's most experienced with that software. We want to analyze the brain signals present to look for …
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The marker stream is just another LSL stream sent from the stimulus presentation software I wrote using PsychoPy. Right, there very well may be some jitter/drift. It's probably required to use hardware approaches if I was doing an ERP study. But in …
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Hi William, I did some experimenting, and it looks like BDF files work fine in EEGLab. However, I wanted to use XDF files because LabRecorder can automatically synchronize an EEG stream with a marker stream and put all of the resulting data into 1 …
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Hi William! I hope you're doing well! Yes, I am using the OpenVIBE speller apps. It is true that the apps are pretty old... However, they do work somewhat with my headset right now -- admittedly not that well. I know Jeremy did a tutorial many year…
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Hi Rafia, I have only heard of these datasets. I don't have much experience using them. A better person to get in contact with is the lead author of each dataset. For example, you can email questions for data set 1 to [email protected]…
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Hello Richard, thanks for your response. I appreciate you going out of your way. I'll keep in touch with OpenBCI support going forward.
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Okay, to alleviate concerns about EMI, I went to a wide open grassy field and tried there. Any solid object was at least a few feet away. I saw heavy packet loss. I also tried dangling the dongle inches away from the monitor using an extension cable…
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Alright, thanks for the help Richard and William. I want to reiterate that some sessions where I just sit on my normal desk next to an AC power supply and plug in my dongle normally, I get no packet loss. But other sessions (with no change in my equ…
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I've tried my bathroom, where I'm putting the laptop on my lap and sitting on the edge of the bathtub, and setting the laptop on a completely wooden table. I've attached a photo of the latter. Both locations still experience packet loss.
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Right, but I've tested this in areas with less EMI and the packet loss is still there. I even went into my bathroom where there is no electrical equipment or metal objects and still I see packet loss.
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But at the same time, I sometimes have perfect sessions (of > 100 s) where I just plug my dongle in normally and don't experience any packet loss.
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I think you might be on to something. When I perch the dongle on my shoulder using the USB extension cable, all the packet drop problems go away. But the instant I put it back on my desk, they reappear again. I would think the RFduinos have better r…
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I measured the Cyton at the back where the + and - signs are. The multimeter returned about 4 V. One thing I do want to note is that packet drops are very rare when I'm not wearing the headset. As a result, I found it really hard to capture a moment…
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Okay great! I can get a DVM really quickly. I'll probably need it in the future anyway. I'm using the recommended one from OpenBCI: https://www.adafruit.com/product/1304. It indicates full charge with an LED, so I charged the battery for a couple of…
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I'm having some trouble finding 6V AA battery packs with JST connectors. Any recommendations for purchasing one?
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I see, I'll try to get my hands on one from Amazon. Thank you two for your continued support. I'll check in once I get results.
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Right. I know what an extension cable is. I cited Richard there more to illustrate my confusion about the primary purpose of using an extension cable. As for the batteries, I use the recommended one from OpenBCI: https://www.sparkfun.com/products/13…
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Unfortunately, switching the channel yielded the same results. I'll go ahead and email OpenBCI. Thanks for all your help, William!
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Also, note that a major portion of BCI is signal processing, which you can do with artificial data. For example, you can see http://www.bbci.de/competition/ for a couple of datasets to play around with. For a good theoretical overview, this Youtube …
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I tried to add a 16-24 Hz bandpass filter recently, so if you need an example you can look at the link below that shows the changes I made to the widget. Note that you need access to Matlab or some other signal processing software as Richard said in…
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Yes, on a Windows desktop the noise is still present. My laptop is running entirely on battery. Hmm.... would I have to replace the Cyton or dongle in that case?
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I'm a bit confused. Richard recommends "moving the Dongle away from the computer with a USB extension cable or USB hub"? Nevertheless, I've tried situating the dongle close to the Cyton, and unfortunately the result is the same. Yes, I've tried othe…
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Unfortunately, I still get some spikes here and there. It is truly strange how channels 1 and 2 aren't affected.... all the electrodes (except the forehead ones, which correspond to channels 1 and 2) are the dry comb FRI electrodes, and upon inspect…
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Hi William, I don't see any messages in the GUI alerting me to packet loss. The video I recorded doesn't show anything either. As for why only certain channels are affected, I'm not sure either. Sometimes all channels do see a spike, but 1 and 2 ar…
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Hello Richard and William, It was indeed packet loss. I ran the GUI with Processing and right when the spikes occurred the following lines in the log were printed: Hub: apparent sampleIndex jump from Serial data: 249 to 251. Keeping packet. (1…