Brain scans offered a clue to why memories may be more difficult to unpick once they have been consolidated by sleep.

脑部扫描为我们提供了为何经睡眠巩固后的记忆更难以消散的线索。

Functional MRI scans of the participants revealed that newly acquired memories were represented by brain activity tightly centred on the hippocampus, the brain's memory centre, but the overnight memories had become more distributed across the cortex.

对受试者的功能性核磁共振扫描表明，新获得的记忆是通过以海马体（大脑的记忆中心）为中心的大脑活动呈现的。然而，过了一夜后，记忆会在大脑皮层内更加分散。

The authors caution that the findings were in healthy participants and are not immediately applicable to conditions like PTSD – and expecting people who have undergone a traumatic experience to start working on suppressing the memory on the same day is "probably not realistic advice".

作者提醒称，该研究是基于健康的受试者的，不能立即应用到诸如创伤后精神紧张性障碍等情况，而且指望有过惨痛经历的人能够当天抑制记忆"是不现实的建议"。

However the research could help design evidence-based treatments for PTSD in the future.

但在未来，这项研究或许会有助于对创伤后精神紧张性障碍设计循证治疗。

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