Date Time Newly described condition causes loss of vertigo and imbalance in TBI patients A condition that causes loss of vertigo perception and imbalance has been diagnosed in traumatic brain injury patients for the first time. A condition that causes loss of vertigo perception and imbalance has been diagnosed in traumatic brain injury patients for the first time. In a clinical study led by researchers at Imperial College London and clinicians at Imperial College Healthcare NHS Trust, out of 37 patients with acute traumatic brain injury (TBI), fifteen were diagnosed with a newly characterised neurological diagnosis called vestibular agnosia – a condition in the brain which results in loss of vertigo perception and imbalance.