Independent component analysis, probably not something you hear about all that often unless you’re in a field that uses it. If you’ve found this via google or the such, then you’re probably looking for an explanation on what the heck ICA is and how to use it. Fear not, today we’re going over the why of ICA, why it works, why we use it, and why it isn’t the perfect tool we wish it was. Hint, the reason it isn’t perfect is because of math, stupid math. Quick note, I’ll be focusing on EEG uses for ICA, but there are tons of other applications and this knowledge will still apply to them as well.(more…)
Well today was the final lab meeting of the term. While the weekly meetings will (probably) be continuing, it’s still a big deal and could (hopefully) mean the end of my six weeks or so of torment. Normally I give it a few days before I talk about just how badly the meeting went, but this time was different and I’m thankful for it. The difference? My main-PI was out for medical reasons, so we got to talk about the project a little more freely.(more…)
Okay I’m taking another break from the “in statistics” posts, at least for today since the next topic is going to be a long multi-day post worth of stuff and I need an easier post for today. I have way too much stuff going on at the moment to organize a long post! In any case, I figure I could give an update to the data I’ve been working with and how that whole mess is going. It’s mind numbing and exhausting work, but not in the way you would think.(more…)
Yesterday’s coding work went better than expected! That may or may not bode will for the rest of the week, but hey at least I’m sort of ahead of schedule. Today I figure we can take a quick look at what I’ve been doing with the data and why. This will be part informative and part me complaining about how everything has to be so damned hard (basically the usual around here). Mostly it will just be some visuals of the things I’ve had to change to get everything looking like my main-PI wants, he’s got a particular style he likes so a lot of large text, bolded labels, etc.(more…)
Since my deadline has come and gone I can look around for a moment, but more importantly I don’t feel the pressure to hyperfocus on a single project. So today instead of working on that dataset I’m switching to a dataset I need to get done before my PhD proposal defense. It’s data that will (assuming I find something) further help make my case for studying my new “super secret” technique for the next 2-3 years depending on how long everything takes.(more…)
It’s the day after thanksgiving and I made my annual I don’t want to have to cook for the next week or two spread of tasty foods. I don’t do the traditional Thanksgiving foods though, I prefer Mexican dishes (since I’m Mexican). Namely I make a huge batch of tamales, since they are a bit of work I tend to make a comically large amount, think 100 or more. So while I have food to last, I need to get back to my main focus and that’s work!(more…)
We can read your mind! Okay, not quite, we can read the electrical activity going on in the brain and we can do this non-invasively. That’s right, you can do it from your own home if you wanted (here). It’s easy and since you don’t have to break the skin, it’s about as safe as can be. The real question here is why does this even work? For that we need to talk a bit on biology so let’s do this!(more…)
Let it be known that I’m a person of my word and today we’re going to give a rather broad overview of ICA and dipoles. Don’t know what those words mean? Well start here and that will give you a high level view of the entire process. Today we’re going to do a slightly deeper dive into what the heck a dipole is, why we use it for ICA and why ICA is so helpful in EEG data processing. Sound like a lot? Well it is, but let’s take a crack at it anyway!(more…)
For those just tuning in, I’ve been busy! I made my deadline, barely. Unfortunately that was one of two. The second requires me to have all the work done, not just part of it. I managed to finish one of ten (yes ten) of the datasets I had, so now I have less than two weeks to finish the rest of it Let’s take it from the top and discuss how we process EEG data!(more…)
Well I’m behind schedule and even though I was given an extra week (6 days now) I don’t know that I’m going to meet my deadline. It’s not me, it’s my computer, things take time to run so I’m stuck waiting for it to do its thing. Today let’s talk about what EEG is and how we make sense of it.(more…)
Today is going to be a somewhat anxious day for me. It’s the day I get to crack open my data and see what spills out. There was a process to get to this point of course, it took me about a week, but today with just a few clicks I’m going to see if I have something or if my idea was never meant to be.Read more… if you dare!
Today was an interesting set of events. I had my meeting with my two PI’s (which I still think would make a hilarious television show). The meeting went well, I’m very excited, but I’m also getting ready to be very, VERY busy. Let’s breakdown how it went shall we?
Today’s post was inspired by a conversation I was having yesterday in the comment section (you know who you are and thank you for the questions). I thought I would elaborate on how we record from the brain and why. There are a lot of different ways we can do this, some of them are super invasive and others are non-invasive. In the lab I work in now, we do things non-invasively there are good things about this and bad things about this, so let’s get into it!
A few days ago I mentioned I did a thing, well an experimental thing really. It was… fun? It was definitely something. Overall it went well, but I said I would give everyone an update and I try to be a man of my word, so let’s do this.
Today I had my experiment (yay), so now I need to process the data. I also sat in another PhD defense for one of our lab members, so now that I have a free second I wanted to give an update. Expect a longer post tomorrow, but for today, I have sooooo much work to do!
Until next time, don’t stop learning!
Here we are another day another post. Today I will be spending the bulk of my time studying and getting my slides ready for the confrence I’ll be attending next week. That will be … fun? However today is also an important day for one of my fellow students, he’s defending his PhD.
It looks like things are moving a little quicker than I thought for me. As you may or may not know, I’m getting ready to do an experiment. Well, we finally (finally!) finalized the protocol and just in time too. While I won’t make the deadline for my project update, I will have some data to show when we get to the conference, which is a good consolation prize.
This is a (somewhat) continuation on what we were discussing in the previous post. We covered the pwelch MATLAB function, this time we will cover the PMTM function, this function uses the Thomson multitaper method to calculate power spectral density. We can do a deep dive into the differences between the two next time, but for now let’s talk about the command itself.*
Signal processing, it’s complex, there are a million ways to go about processing a signal, and like life, there is no best way to go about doing it. Trust me, it is as frustrating as it sounds. Today’s scratch pad note is on power spectral density or PSD for short. So let’s dive in.*