Search found 12 matches

by ty22
Fri May 10, 2019 1:30 pm
Forum: Mind Monitor
Topic: Preprocessing raw data
Replies: 11
Views: 22493

Re: Preprocessing raw data

James wrote: Fri May 10, 2019 11:52 amSure.
Thanks. I also wanted to denise the FFT results based on it. However they are computed on a period of time (for example 4 sec) instead of on the timestamp where the outlier is, in this case, what should I do? Thanks a lot!
by ty22
Fri May 10, 2019 11:33 am
Forum: Mind Monitor
Topic: Preprocessing raw data
Replies: 11
Views: 22493

Re: Preprocessing raw data

James wrote: Tue May 07, 2019 8:14 am Probably, but I'm not sure what it would look like.
Hi James, since the voltage of raw EEG signal usually lies between 850+-100uV, I see a lot of outliers due to lack of contact of sensors during the tests. Do you think I can remove some noise by deleting everything out of this range?
by ty22
Mon May 06, 2019 8:55 pm
Forum: Mind Monitor
Topic: Preprocessing raw data
Replies: 11
Views: 22493

Re: Preprocessing raw data

The bottom left graph is the average of the left and the average of the right for each band over the entire session. If you click on a specific point on the graph, you will get another graph shown under it showing just that point in time. The left side is always negative so that it renders correctl...
by ty22
Sun May 05, 2019 2:11 pm
Forum: Mind Monitor
Topic: Preprocessing raw data
Replies: 11
Views: 22493

Re: Preprocessing raw data

All I can tell from this is that the subject wasn't relaxed. Sorry, like I said, my personal research is on relaxation! Regarding symmetry, the little graph in the bottom left, shows the left vs right power for each wave. In this example you can see it was more left than right. If you hover your mo...
by ty22
Sat May 04, 2019 11:01 pm
Forum: Mind Monitor
Topic: Preprocessing raw data
Replies: 11
Views: 22493

Re: Preprocessing raw data

1 - I don't. It's done automatically by the Interaxon SDK before my code gets the values. I believe they are removing blinks and power line interference. 2 - I'm not sure sorry. My personal research has been focused on relaxation. Thanks for your reply, I've read many articles on how brain works, a...
by ty22
Fri May 03, 2019 3:47 am
Forum: Mind Monitor
Topic: Preprocessing raw data
Replies: 11
Views: 22493

Preprocessing raw data

Hi, I really like your app thanks! I'm some questions: 1. how do you preprocessing the data to remove the artefacts? 2. if I have a piece of recorded data and I want to know if the person is in a highly nervous/frightened state, should I compute the average value of all 4 electrodes for Beta band or...
by ty22
Thu Apr 18, 2019 3:09 pm
Forum: Mind Monitor
Topic: How to calculate frontal asymmetry
Replies: 4
Views: 3034

Re: How to calculate frontal asymmetry

Thank you very much!
by ty22
Thu Apr 18, 2019 12:32 pm
Forum: Mind Monitor
Topic: How to calculate frontal asymmetry
Replies: 4
Views: 3034

Re: How to calculate frontal asymmetry

Thank you for your reply. If I do (x+1)x50, does it make it in db unit? If so, then there is no need to do log, subtraction will do the work.
by ty22
Wed Apr 17, 2019 10:03 pm
Forum: Mind Monitor
Topic: How to calculate frontal asymmetry
Replies: 4
Views: 3034

How to calculate frontal asymmetry

Hi I want to calculate frontal asymmetry from the AF7 and AF8 electrodes. I see the in the output csv files there are Alpha_AF7 and Alpha_AF8. I need to compute log(AF8 value/AF7 value) but I see lots of values in the csv file are negative (usually between -1 and 1), which doesn't allow me to comput...
by ty22
Tue Feb 19, 2019 9:16 am
Forum: Mind Monitor
Topic: How to process the raw data for ERP analysis?
Replies: 3
Views: 2295

Re: How to process the raw data for ERP analysis?

Thanks. Is there any tool to do a bandpass filter to the muse monitor csv file?