科技日报北京 4 月 8 日电 （记者张梦然）伴随着人体衰老，大脑对信息加工和储存的能力也必然会下降，但如果这种能力可以被逆转呢？据英国《自然·神经科学》杂志 8 日在线发表的一项研究，美国科学家通过同步脑区节律——按特定节律刺激颞叶和额叶前部，成功恢复了老年人的工作记忆，实现了逆转与年龄相关的工作记忆衰退。
工作记忆指的是一种短时存储信息以备后用的能力，这是一个“容量有限”的系统，它会随着年龄增长而下降。在青年人群中，工作记忆与脑区内部以及脑区之间的特定神经互作有关。据信这个过程涉及额叶前部和颞叶的两种神经振荡模式（或称脑波），即 gamma 节律和 theta 节律。额叶前部和颞叶的 theta 振荡同步，也与工作记忆相关，被认为或会促进这些脑区的长程互作。
此次，美国波士顿大学科学家罗伯特·瑞恩哈特和约翰·阮的团队，利用脑电图（EEG）详细检查了这类互作在老年人中有何变化，以及与工作记忆有何关联。他们决定采用非侵入性脑刺激方法调节与工作记忆相关的脑波互作。
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