{
  "annotation_id": "303b611a-4792-4e6b-9a67-9aac6761ccb4",
  "date_created": "2026-03-02T18:01:17.898000Z",
  "date_modified": "2026-03-02T18:01:17.898000Z",
  "file_hash": "73c70bc3ec2825fa53b8fc940e7677e9129fe1a5543b0ef4fb991a2810b481a4",
  "private": false,
  "record": {
    "abstract": "Transitions in the dynamics of complex systems can be characterized by\nchanges in the synchronization behavior of their components. Taking the human\ncardio-respiratory system as an example and using an automated procedure for\nscreening the synchrograms of 112 healthy subjects we study the frequency and\nthe distribution of synchronization episodes under different physiological\nconditions that occur during sleep. We find that phase synchronization between\nheartbeat and breathing is significantly enhanced during non-rapid-eye-movement\n(non-REM) sleep (deep sleep and light sleep) and reduced during REM sleep. Our\nresults suggest that the synchronization is mainly due to a weak influence of\nthe breathing oscillator upon the heartbeat oscillator, which is disturbed in\nthe presence of long-term correlated noise, superimposed by the activity of\nhigher brain regions during REM sleep.",
    "arxiv_id": "physics/0701326",
    "authors": [
      "Ronny Bartsch",
      "Jan W. Kantelhardt",
      "Thomas Penzel",
      "Shlomo Havlin"
    ],
    "categories": [
      "physics.data-an",
      "physics.med-ph"
    ],
    "doi": "10.1103/PhysRevLett.98.054102",
    "journal_ref": "Phys. Rev. Lett. 98, 054102 (2007)",
    "title": "Experimental evidence for phase synchronization transitions in human   cardio-respiratory system",
    "url": "https://arxiv.org/abs/physics/0701326"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "77466c45-9822-4e20-8bf1-2f7836d8d4bf",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}