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Quantitative assessment of visual behavior in disorders of consciousness

机译：意识障碍中视觉行为的定量评估

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The study of eye behavior is of paramount importancein the differential diagnosis of disorders of consciousnessHc(DoC). In spite of this, assessment of eye movement patterns in patients with vegetative state (VS) or minimally conscious state (MCS) only relies on clinical evaluation. In this study we aimed to provide a quantitative assessment of visual tracking behavior in response to moving stimuli in DoC patients. Nine VS patients and nine MCS patients were recruited in a Neurorehabilitation Unit for patients with chronic DoC; 11 matched healthy subjects were tested as the control group. All participants underwent a quantitative evaluation of eye-tracking pattern by means of a computerized infrared eye-tracker system; stimuli were represented by a red circle or a small color picture slowly moving on a PC monitor. The proportion of on- or off-target fixations differed significantly between MCS and VS. Most importantly, the distribution of fixations on or off the target in all VS patients was at or below the chance level, whereas in the MCS group seven out of nine patients showed a proportion of on-target fixations significantlyhigher than the chance level. Fixation length did not differ among the three groups significantly. The present quantitative assessment of visual behaviour in a tracking task demonstrated that MCS and VS patients differ in the proportion of on-target fixations. These results could have important clinical implications since the quantitative analysis of visual behavior might provide additional elements in the differential diagnosis of DoC.
机译：眼行为的研究在意识障碍HC（DoC）的鉴别诊断中至关重要。尽管如此，对处于营养状态（VS）或最低意识状态（MCS）的患者眼动模式的评估仅依赖于临床评估。在这项研究中，我们旨在为DoC患者响应运动刺激的视觉跟踪行为提供定量评估。在神经康复科招募了9名VS患者和9名MCS患者用于慢性DoC患者;将11名匹配的健康受试者作为对照组进行测试。所有参与者都通过计算机化的红外眼动仪系统对眼动图进行了定量评估;刺激由在PC监视器上缓慢移动的红色圆圈或小图片表示。在MCS和VS之间，目标固定或目标外固定的比例明显不同。最重要的是，所有VS患者在目标上或目标外的注视物分布均处于或低于机会水平，而在MCS组中，九分之七的患者显示的目标上注视率显着高于机会水平。三组之间的固定长度无明显差异。当前对跟踪任务中视觉行为的定量评估表明，MCS和VS患者的目标固定比例不同。这些结果可能具有重要的临床意义，因为视觉行为的定量分析可能在DoC的鉴别诊断中提供其他要素。

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