This is my first attempt at analysing EEG data and time series in general, and I have a few very basic questions. A few channels seem to have negative readings, how should I interpret this? Is the current going in the other direction, does this mean the activity is inhibitory? In other words, what is the baseline? Also, the average for each channel seems very different, what is the meaning of this, and should I worry about this, or just demean each time window I am considering (wouldn't I eliminate potentially interesting low-frequency signal if I do this)?
", "messages": [ { "id": "89125", "postDate": "08/11/2015 18:34:37", "content": "This is my first attempt at analysing EEG data and time series in general, and I have a few very basic questions. A few channels seem to have negative readings, how should I interpret this? Is the current going in the other direction, does this mean the activity is inhibitory? In other words, what is the baseline? Also, the average for each channel seems very different, what is the meaning of this, and should I worry about this, or just demean each time window I am considering (wouldn't I eliminate potentially interesting low-frequency signal if I do this)?
", "rawMarkdown": "This is my first attempt at analysing EEG data and time series in general, and I have a few very basic questions. A few channels seem to have negative readings, how should I interpret this? Is the current going in the other direction, does this mean the activity is inhibitory? In other words, what is the baseline? Also, the average for each channel seems very different, what is the meaning of this, and should I worry about this, or just demean each time window I am considering (wouldn't I eliminate potentially interesting low-frequency signal if I do this)?", "votes": null }, { "id": "89142", "postDate": "08/12/2015 00:45:09", "content": "I'll keep adding questions as they come. Is there anything special about the first channel? It should be a left frontopolar electrode, but looking at the waveforms - unless I've made a mistake - it seems to have a different timecourse from the others. Has anyone else got the same, and, if it's true, why?
", "rawMarkdown": "I'll keep adding questions as they come. Is there anything special about the first channel? It should be a left frontopolar electrode, but looking at the waveforms - unless I've made a mistake - it seems to have a different timecourse from the others. Has anyone else got the same, and, if it's true, why?", "votes": null }, { "id": "89404", "postDate": "08/14/2015 20:56:15", "content": "Can we assume the algorithm will always have to detect this sequence of events, can we use information about the correct order in the sequence to guide prediction?
", "rawMarkdown": "Can we assume the algorithm will always have to detect this sequence of events, can we use information about the correct order in the sequence to guide prediction?", "votes": null } ], "comments": [ { "id": 89142, "author_name": "ana4min", "author_url": "", "post_date": "08/12/2015 00:45:09", "content": "I'll keep adding questions as they come. Is there anything special about the first channel? It should be a left frontopolar electrode, but looking at the waveforms - unless I've made a mistake - it seems to have a different timecourse from the others. Has anyone else got the same, and, if it's true, why?
", "votes": null, "replies": [] }, { "id": 89404, "author_name": "ana4min", "author_url": "", "post_date": "08/14/2015 20:56:15", "content": "Can we assume the algorithm will always have to detect this sequence of events, can we use information about the correct order in the sequence to guide prediction?
", "votes": null, "replies": [] } ], "raw_markdown_by_id": { "89125": "This is my first attempt at analysing EEG data and time series in general, and I have a few very basic questions. A few channels seem to have negative readings, how should I interpret this? Is the current going in the other direction, does this mean the activity is inhibitory? In other words, what is the baseline? Also, the average for each channel seems very different, what is the meaning of this, and should I worry about this, or just demean each time window I am considering (wouldn't I eliminate potentially interesting low-frequency signal if I do this)?", "89142": "I'll keep adding questions as they come. Is there anything special about the first channel? It should be a left frontopolar electrode, but looking at the waveforms - unless I've made a mistake - it seems to have a different timecourse from the others. Has anyone else got the same, and, if it's true, why?", "89404": "Can we assume the algorithm will always have to detect this sequence of events, can we use information about the correct order in the sequence to guide prediction?" }, "source": "meta" }