[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"health-studies-list:{\"conditionNormalized\":\"bodily-self-consciousness\",\"overallStatus\":[\"RECRUITING\",\"AVAILABLE\",\"NOT_YET_RECRUITING\"],\"orderBy\":\"LastUpdateSubmitDate:desc\",\"size\":25,\"offset\":0}":3,"health-study-condition:bodily-self-consciousness":28},{"pageToken":4,"total":5,"offset":6,"count":5,"results":7},null,1,0,[8],{"id":9,"slug":10,"hasResults":11,"nctId":12,"briefTitle":13,"officialTitle":13,"acronym":14,"eligibilityCriteria":15,"healthyVolunteers":16,"sex":17,"minAge":18,"maxAge":19,"enrollmentInfo":20,"targetDuration":4,"studyType":23,"phases":24,"briefSummary":26,"conditions":27,"keywords":31,"overallStatus":42,"whyStopped":4,"lastUpdateSubmitDate":43,"lastUpdatePostDateStruct":44,"startDateStruct":47,"completionDateStruct":49,"leadSponsor":51,"locationsCount":5},"100652287","hyperventilation-effects-on-bodily-self-consciousness-100652287",false,"NCT07769710","Hyperventilation Effects on Bodily Self-Consciousness","HYPERSELF","Inclusion Criteria:\n\n* Healthy adult aged 18-55 years\n* Able to provide written informed consent\n* Normal or corrected-to-normal vision\n* Sufficient German or English to follow instructions and complete questionnaires\n* Tolerates the \\~5-minute VR-guided hyperventilation test at screening\n\nExclusion Criteria:\n\n* Cardiovascular or cerebrovascular disease posing a risk during hyperventilation (e.g., myocardial infarction or stroke within 12 months, significant\u002Funstable cardiac disease, heart failure, uncontrolled\u002Fsevere hypertension, aneurysm, Moyamoya)\n* Respiratory disease (asthma, COPD, restrictive lung disease, pulmonary fibrosis, recent severe lung infection, dyspnoea at rest)\n* Haematological disease (sickle cell disease or trait, severe anaemia)\n* Neurological disease (epilepsy or seizures, severe\u002Frecurrent migraine, neurodegenerative disorder)\n* Psychiatric disorder (panic or severe anxiety disorder, psychosis or schizophrenia, severe bipolar disorder, acute major depression, acute addiction)\n* Metabolic disease (Type 1 or poorly controlled Type 2 diabetes, BMI \\> 35)\n* Pregnancy (confirmed by urine test at screening) or planned pregnancy during the study period\n* Medication affecting respiration or brain function\n* Physical inability to cooperate or to remain seated for the \\~188-minute experimental visit\n* Insufficient understanding of study procedures and risks\n* Intolerable reaction to the hyperventilation tolerance test at screening",true,"ALL","18 Years","55 Years",{"count":21,"type":22},35,"ESTIMATED","INTERVENTIONAL",[25],"NA","This study examines how voluntary fast, deep breathing (hyperventilation) affects the way healthy adults perceive their own body. Participants wear a virtual-reality (VR) headset and see a virtual body; a glowing halo around it either pulses exactly in time with their own breathing or is time-shifted. During the study, breathing, heart activity, blood-oxygen level, the carbon-dioxide content of exhaled air, and brain activity (EEG, measured non-invasively from the scalp) are recorded continuously, and participants complete questionnaires about their experience.\n\nThe aim is to understand whether and how altered breathing changes the interplay between what people see and what they feel inside their body, and thereby the sense of being located within one's own body. The study uses a 2×2 within-subjects design crossing Breathing (normal vs. hyperventilation) with Visual synchrony (synchronous vs. asynchronous), with the asynchronous and normal-breathing conditions serving as within-subject controls.\n\nNo medication is administered and no medical device is being tested; the instruments used serve only for monitoring and measurement. Participation involves a screening visit (including a short, \\~5-minute guided-hyperventilation tolerance test) and an experimental visit.",[28,29,30],"Bodily Self-Consciousness","Interoception","Healthy Volunteers",[32,33,34,35,36,37,38,39,40,41],"hyperventilation","bodily self-consciousness","full-body illusion","respiratory-visual synchrony","interoception","virtual reality","EEG","heartbeat-evoked potential","altered states of consciousness","breathwork","NOT_YET_RECRUITING","2026-08-12",{"date":45,"type":46},"2026-08-18","ACTUAL",{"date":48,"type":22},"2026-09-01",{"date":50,"type":22},"2027-07-31",{"name":52,"class":53},"University of Fribourg","OTHER"]