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      "task": "eyesopen"
    },
    "signal_summary": {
      "nchans": 61,
      "ntimes": 150000,
      "recording_duration": 300,
      "channel_type_counts": {
        "EEG": 61
      }
    },
    "provenance": {
      "digested_at": "2026-06-25T22:10:17.979Z"
    },
    "signal_properties": {
      "sampling_frequency": 500
    }
  }
]