Clues to the underlying causes of boredom have come from patients who suffer traumatic brain injuries (TBI). People with TBI often begin to indulge in riskier activities after their accidents.

从一些有脑外伤(TBI)的病人身上，可以得到有关烦闷成因的一些线索：脑外伤的人，最初的表现就是容易沉湎于危险程度较高的活动。

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Thus, it is not clear how many soldiers have received the Purple Heart for mild traumatic brain injuries, or how many applied but were denied.

这样以来，有多少士兵因野外脑部伤势而获得紫心勋章，有多少士兵想要得到紫心勋章但是被拒绝的人数就不清楚了。

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The patients there are people who have had traumatic brain injuries, cerebral hemorrhages or tumor treatments.

这些病人都接受过脑外伤、脑出血或者肿瘤治疗。

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"After a while it gets old and not so fulfilling to take the brain out when (an athlete) is dead, " said Bailes, a neurosurgeon and director of the Brain Injury Research Institute, which focuses on the study of traumatic brain injuries and their prevention.

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The constant threat of IEDs has meant a new generation of service members with multiple traumatic injuries, including Traumatic Brain Injury.

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While that funding was later reinstated, it was re-designated for medical research on traumatic brain injuries.

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