Features of PPV, SMD, VV, and CSD that informed the definition of PPPD

Abbreviations: BPPV – benign paroxysmal positional vertigo CSD – chronic subjective dizziness fMRI – functional magnetic resonance imaging ICD‐11 – International Classification of Diseases, 11th edition (beta draft) ICVD – International Classification of Vestibular Disorders MdDS – mal de debarquement syndrome PIVC – parieto‐insular vestibular cortex PPPD – persistent postural‐perceptual dizziness PPV – phobic postural vertigo SMD – space‐motion discomfort VV – visual vertigo