In other words, acute vestibular syndrome patients who have about a 10 to 25% chance of experiencing stroke, vs. vestibular neuritis which is a relatively more benign inner ear disturbance. His group derived an acronym for bedside eye movement tests know as HINTS: HI for Head Impulse test, N for Nystagmus, and TS for Test of Skew or vertical misalignment on cover testing. 12% of stroke patients initially yield false negatives on MRI testing whereas the HINTS testing was 100% accurate. One challenge had been that HINTS is dependent on the skill of the examiner.