{
  "id": 467655,
  "title": "What is the Physical Unit of EEG data?",
  "url": "/competitions/hms-harmful-brain-activity-classification/discussion/467655",
  "author_name": "Bilzard",
  "post_date": "2024-01-13T12:56:54.262000",
  "votes": 9,
  "comment_count": 6,
  "views": 0,
  "content": "<p>I want to ask host about the exact data-acquisition process.</p>\n<ol>\n<li>what is the physical unit of EEG data?</li>\n<li>how spectrograms are processed, and what is the physical unit of spectrogram data?</li>\n<li>Preferably, with the specification of entire data acquisition process.</li>\n</ol>\n<p>At least without physical unit of data, it's difficult to correctly handle data in reasonable way. </p>\n<p><a href=\"https://www.kaggle.com/sohier\" target=\"_blank\">@sohier</a> Could you consider to ask host about this?</p>",
  "messages": [
    {
      "id": 2600194,
      "postDate": "2024-01-13T12:56:54.263Z",
      "content": "<p>I want to ask host about the exact data-acquisition process.</p>\n<ol>\n<li>what is the physical unit of EEG data?</li>\n<li>how spectrograms are processed, and what is the physical unit of spectrogram data?</li>\n<li>Preferably, with the specification of entire data acquisition process.</li>\n</ol>\n<p>At least without physical unit of data, it's difficult to correctly handle data in reasonable way. </p>\n<p><a href=\"https://www.kaggle.com/sohier\" target=\"_blank\">@sohier</a> Could you consider to ask host about this?</p>",
      "rawMarkdown": "I want to ask host about the exact data-acquisition process.\n\n1. what is the physical unit of EEG data?\n2. how spectrograms are processed, and what is the physical unit of spectrogram data?\n3. Preferably, with the specification of entire data acquisition process.\n\nAt least without physical unit of data, it's difficult to correctly handle data in reasonable way. \n\n@sohier Could you consider to ask host about this?",
      "votes": 8
    },
    {
      "id": 2664223,
      "postDate": "2024-02-22T21:54:02.157Z",
      "content": "<ol>\n<li>The sample images indicate micro volts for raw EEG signal.</li>\n<li>Not sure how the spectrograms are processed, but I believe the code used <a href=\"https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/479001\" target=\"_blank\">here</a> is close.</li>\n<li>I would like to know more about the data acquisition, too. </li>\n</ol>\n<p><img src=\"https://www.googleapis.com/download/storage/v1/b/kaggle-forum-message-attachments/o/inbox%2F3223907%2F65176ceba0111492e9aee975e664fdd1%2FScreenshot%202024-02-22%20at%201.49.13PM.png?generation=1708638585287553&amp;alt=media\"></p>",
      "rawMarkdown": "1. The sample images indicate micro volts for raw EEG signal.\n2. Not sure how the spectrograms are processed, but I believe the code used [here](https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/479001) is close.\n3. I would like to know more about the data acquisition, too. \n\n![](https://www.googleapis.com/download/storage/v1/b/kaggle-forum-message-attachments/o/inbox%2F3223907%2F65176ceba0111492e9aee975e664fdd1%2FScreenshot%202024-02-22%20at%201.49.13PM.png?generation=1708638585287553&alt=media)",
      "votes": 3
    },
    {
      "id": 2665141,
      "postDate": "2024-02-23T12:57:26.977Z",
      "content": "<p>The hosts provided a pretty detailed document on the overview page. </p>\n<p><a href=\"https://www.acns.org/UserFiles/file/ACNSStandardizedCriticalCareEEGTerminology_rev2021.pdf\" target=\"_blank\">https://www.acns.org/UserFiles/file/ACNSStandardizedCriticalCareEEGTerminology_rev2021.pdf</a></p>\n<p>The web site provides more on the data acquisition process.</p>\n<p><a href=\"https://www.acns.org/practice/guidelines\" target=\"_blank\">https://www.acns.org/practice/guidelines</a></p>",
      "rawMarkdown": "The hosts provided a pretty detailed document on the overview page. \n\nhttps://www.acns.org/UserFiles/file/ACNSStandardizedCriticalCareEEGTerminology_rev2021.pdf\n\nThe web site provides more on the data acquisition process.\n\nhttps://www.acns.org/practice/guidelines",
      "votes": 1
    },
    {
      "id": 2662379,
      "postDate": "2024-02-21T21:16:08.320Z",
      "content": "<p>Did we ever figure out what the exact unit is <a href=\"https://www.kaggle.com/tatamikenn\" target=\"_blank\">@tatamikenn</a>? </p>",
      "rawMarkdown": "Did we ever figure out what the exact unit is @tatamikenn? "
    },
    {
      "id": 2600991,
      "postDate": "2024-01-14T03:48:40.473Z",
      "content": "<p>What do you mean by physical unit? I'm pretty sure it's voltage for EEG if I get what you're asking</p>",
      "rawMarkdown": "What do you mean by physical unit? I'm pretty sure it's voltage for EEG if I get what you're asking",
      "replies": [
        {
          "id": 2601226,
          "postDate": "2024-01-14T09:06:32.077Z",
          "content": "<p>It means the <em>physically meaningful value</em> of the voltage. e.g. uV or somehow normalized? etc.<br>\nGenerally we should care this (instead of normalized, relative values), especially if certain absolute value is important. E.g. voltage change greater than 100uV should be cared etc.</p>\n<p>However, the scale of input itself is no problem since we can adapt them to training data.<br>\nWhat I cared most is about the rationale about proper handling of input data. e.g. mean-std normalization is authenticate, etc.</p>",
          "rawMarkdown": "It means the *physically meaningful value* of the voltage. e.g. uV or somehow normalized? etc.\nGenerally we should care this (instead of normalized, relative values), especially if certain absolute value is important. E.g. voltage change greater than 100uV should be cared etc.\n\nHowever, the scale of input itself is no problem since we can adapt them to training data.\nWhat I cared most is about the rationale about proper handling of input data. e.g. mean-std normalization is authenticate, etc.",
          "votes": 1,
          "replies": [
            {
              "id": 2601232,
              "postDate": "2024-01-14T09:12:54.090Z",
              "rawMarkdown": "",
              "isDeleted": true
            }
          ]
        }
      ]
    }
  ],
  "comments": [
    {
      "id": 2664223,
      "author_name": "Sean R.B. Bearden, Ph.D.",
      "author_url": "",
      "post_date": "2024-02-22T21:54:02.157000",
      "content": "<ol>\n<li>The sample images indicate micro volts for raw EEG signal.</li>\n<li>Not sure how the spectrograms are processed, but I believe the code used <a href=\"https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/479001\" target=\"_blank\">here</a> is close.</li>\n<li>I would like to know more about the data acquisition, too. </li>\n</ol>\n<p><img src=\"https://www.googleapis.com/download/storage/v1/b/kaggle-forum-message-attachments/o/inbox%2F3223907%2F65176ceba0111492e9aee975e664fdd1%2FScreenshot%202024-02-22%20at%201.49.13PM.png?generation=1708638585287553&amp;alt=media\"></p>",
      "votes": 3,
      "replies": []
    },
    {
      "id": 2665141,
      "author_name": "PC Jimmmy",
      "author_url": "",
      "post_date": "2024-02-23T12:57:26.977000",
      "content": "<p>The hosts provided a pretty detailed document on the overview page. </p>\n<p><a href=\"https://www.acns.org/UserFiles/file/ACNSStandardizedCriticalCareEEGTerminology_rev2021.pdf\" target=\"_blank\">https://www.acns.org/UserFiles/file/ACNSStandardizedCriticalCareEEGTerminology_rev2021.pdf</a></p>\n<p>The web site provides more on the data acquisition process.</p>\n<p><a href=\"https://www.acns.org/practice/guidelines\" target=\"_blank\">https://www.acns.org/practice/guidelines</a></p>",
      "votes": 1,
      "replies": []
    },
    {
      "id": 2662379,
      "author_name": "Shane Simon",
      "author_url": "",
      "post_date": "2024-02-21T21:16:08.320000",
      "content": "<p>Did we ever figure out what the exact unit is <a href=\"https://www.kaggle.com/tatamikenn\" target=\"_blank\">@tatamikenn</a>? </p>",
      "votes": 0,
      "replies": []
    },
    {
      "id": 2600991,
      "author_name": "Shane Simon",
      "author_url": "",
      "post_date": "2024-01-14T03:48:40.473000",
      "content": "<p>What do you mean by physical unit? I'm pretty sure it's voltage for EEG if I get what you're asking</p>",
      "votes": 0,
      "replies": [
        {
          "id": 2601226,
          "author_name": "Bilzard",
          "author_url": "",
          "post_date": "2024-01-14T09:06:32.077000",
          "content": "<p>It means the <em>physically meaningful value</em> of the voltage. e.g. uV or somehow normalized? etc.<br>\nGenerally we should care this (instead of normalized, relative values), especially if certain absolute value is important. E.g. voltage change greater than 100uV should be cared etc.</p>\n<p>However, the scale of input itself is no problem since we can adapt them to training data.<br>\nWhat I cared most is about the rationale about proper handling of input data. e.g. mean-std normalization is authenticate, etc.</p>",
          "votes": 1,
          "replies": [
            {
              "id": 2601232,
              "author_name": "",
              "author_url": "",
              "post_date": "2024-01-14T09:12:54.090000",
              "content": "",
              "votes": 0,
              "replies": []
            }
          ]
        }
      ]
    }
  ],
  "raw_markdown_by_id": {
    "2600194": "I want to ask host about the exact data-acquisition process.\n\n1. what is the physical unit of EEG data?\n2. how spectrograms are processed, and what is the physical unit of spectrogram data?\n3. Preferably, with the specification of entire data acquisition process.\n\nAt least without physical unit of data, it's difficult to correctly handle data in reasonable way. \n\n@sohier Could you consider to ask host about this?",
    "2664223": "1. The sample images indicate micro volts for raw EEG signal.\n2. Not sure how the spectrograms are processed, but I believe the code used [here](https://www.kaggle.com/competitions/hms-harmful-brain-activity-classification/discussion/479001) is close.\n3. I would like to know more about the data acquisition, too. \n\n![](https://www.googleapis.com/download/storage/v1/b/kaggle-forum-message-attachments/o/inbox%2F3223907%2F65176ceba0111492e9aee975e664fdd1%2FScreenshot%202024-02-22%20at%201.49.13PM.png?generation=1708638585287553&alt=media)",
    "2665141": "The hosts provided a pretty detailed document on the overview page. \n\nhttps://www.acns.org/UserFiles/file/ACNSStandardizedCriticalCareEEGTerminology_rev2021.pdf\n\nThe web site provides more on the data acquisition process.\n\nhttps://www.acns.org/practice/guidelines",
    "2662379": "Did we ever figure out what the exact unit is @tatamikenn? ",
    "2600991": "What do you mean by physical unit? I'm pretty sure it's voltage for EEG if I get what you're asking"
  }
}