{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://openvisual.org/schema/brain-fog/1.0",
  "title": "OVS: Brain Fog",
  "description": "Visual correlate of brain fog: a whitish haze with mild defocus that waxes and wanes, accompanying transient cognitive dysfunction. HPO Brain fog (HP:0033630), occasional in VSS. Poor concentration (HP:0031987) is recorded via the session `accompanying_symptoms` list.",
  "allOf": [
    {
      "$ref": "https://openvisual.org/schema/symptom-base/1.0"
    },
    {
      "type": "object",
      "properties": {
        "ovs_type": {
          "const": "ovs:brain-fog"
        },
        "fluctuation_period_sec": {
          "type": "number",
          "minimum": 0,
          "description": "Typical period over which the haze comes and goes, in seconds"
        }
      }
    }
  ]
}