{
  "id": 7344,
  "title": "Activity propagation speed",
  "url": "/competitions/connectomics/discussion/7344",
  "author_name": "",
  "post_date": "2014-03-10T21:47:36.810Z",
  "votes": null,
  "comment_count": 4,
  "views": 869,
  "content": "<p>I have been exploring the mock dataset and trying to see for which time difference we get&nbsp; maximal correlation between two fluorescence time series. To my surprise I find that the correlation is maximum for zero time difference.</p>\n<p>I would expect that the correlation would be maximal for some finite time difference depending on the distance between the neurons and reflecting the fact that the activity is propagating at some finite speed and not instantaneously.</p>\n<p>Is there something wrong with this reasoning?</p>",
  "messages": [
    {
      "id": "40118",
      "postDate": "03/10/2014 21:47:36",
      "content": "<p>I have been exploring the mock dataset and trying to see for which time difference we get&nbsp; maximal correlation between two fluorescence time series. To my surprise I find that the correlation is maximum for zero time difference.</p>\n<p>I would expect that the correlation would be maximal for some finite time difference depending on the distance between the neurons and reflecting the fact that the activity is propagating at some finite speed and not instantaneously.</p>\n<p>Is there something wrong with this reasoning?</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "40119",
      "postDate": "03/10/2014 22:07:31",
      "content": "<p>Yes, the problem is that sampling is slow as compared to neural&nbsp;communication.</p>\n\n<p>https://www.kaggle.com/c/connectomics/forums/t/7036/question-about-neurons</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "40123",
      "postDate": "03/10/2014 23:34:07",
      "content": "<p>Have a look even at this discussion!</p>\n<p>https://www.kaggle.com/c/connectomics/forums/t/7238/neural-activity-vs-fluorescence</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "40129",
      "postDate": "03/11/2014 00:22:00",
      "content": "<p>Ok,</p>\n<p>thanks. Sorry for the double posting :(</p>",
      "rawMarkdown": "",
      "votes": null
    },
    {
      "id": "40152",
      "postDate": "03/11/2014 07:51:56",
      "content": "<p>On the contrary! Thanks for allowing us to spotlight again useful old threads!</p>",
      "rawMarkdown": "",
      "votes": null
    }
  ],
  "comments": [
    {
      "id": 40119,
      "author_name": "jay670790",
      "author_url": "",
      "post_date": "03/10/2014 22:07:31",
      "content": "<p>Yes, the problem is that sampling is slow as compared to neural&nbsp;communication.</p>\n\n<p>https://www.kaggle.com/c/connectomics/forums/t/7036/question-about-neurons</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 40123,
      "author_name": "simplicio",
      "author_url": "",
      "post_date": "03/10/2014 23:34:07",
      "content": "<p>Have a look even at this discussion!</p>\n<p>https://www.kaggle.com/c/connectomics/forums/t/7238/neural-activity-vs-fluorescence</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 40129,
      "author_name": "kontoudi",
      "author_url": "",
      "post_date": "03/11/2014 00:22:00",
      "content": "<p>Ok,</p>\n<p>thanks. Sorry for the double posting :(</p>",
      "votes": null,
      "replies": []
    },
    {
      "id": 40152,
      "author_name": "simplicio",
      "author_url": "",
      "post_date": "03/11/2014 07:51:56",
      "content": "<p>On the contrary! Thanks for allowing us to spotlight again useful old threads!</p>",
      "votes": null,
      "replies": []
    }
  ],
  "raw_markdown_by_id": {
    "40118": "",
    "40119": "",
    "40123": "",
    "40129": "",
    "40152": ""
  },
  "source": "meta"
}