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应用介绍
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三,1111,aaa
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五,aaa,aaaaaaaa
六,adddddd,aaa
七,aaaaaaaa
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你的前额叶,真的受损了吗(唠“科”)
“注意力涣散、情绪易冲动”“做事拖拉”“感觉脑子不转了”……最近,调侃自己“前额叶受损”,是个热门网络话题。
果真如此吗?从医学角度看,这种自我诊断并不准确。
“前额叶”位于大脑额叶的前端、额头后方,负责运动控制、语言输出、任务计划、冲动抑制、欲望管控,并调控注意力、情绪与人格。它虽体积占比很小,却是人体认知功能的指挥部。面对美食能克制、难题分步解决、工作屏蔽干扰,均赖其调控。
前额叶受损往往有明确的诱因,如头部外伤、脑血管病、肿瘤、炎症、中毒、代谢病等。损伤部位不同,症状各异:背外侧受损会让人执行力骤降,难以完成简单计划;眶额叶受损可能引发性格突变,原本温和的人或将变得暴躁冲动;内侧受损则可能导致认知障碍,出现强握摸索等无意识动作。这些情况需要神经科医生通过检查确诊。
网传的所谓“前额叶受损”无器质性损坏,实为“功能性疲劳”,系信息过载致前额叶功能下降,类似手机中APP过多引发卡顿。大脑在信息过载下也会“降频”,在医学上被称为“认知疲劳”,常见于长期高压工作、刷短视频停不下来、多线程处理任务的现代人身上。由于前额叶的神经突触连接效率暂时下降,神经递质分泌失衡,反应变慢、注意力分散、情绪易波动。
这种“功能降频”虽非器质性,但危害不容小觑。短期看,它会降效,让人陷入“越忙越乱、越乱越忙”的恶性循环。长期持续消耗大脑这个“中枢处理器”的内存,会导致大脑网络运行速率下降,严重时或可造成不可逆的功能损害。研究发现,持续信息过载会过度激活大脑的应激系统,导致皮质醇水平升高,进而损伤海马体。前额叶功能长期低下,脑内多种与情绪相关的递质可能出现变化,会影响情绪调节,增加抑郁、焦虑的风险。有研究表明,不少患者正是因长期“大脑过载”出现情绪障碍。
大脑“减负”要从源头上进行“信息节食”,主动减少无效信息的摄入,留出整理和修复时段。可设每日“深度工作”时段,选一个时段处理最难的任务,避免干扰,逐步延长专注时长,锻炼前额叶“耐力”。
睡眠是大脑突触连接修复的关键,前额叶的修复主要在深度睡眠中进行。建议避免熬夜、减少睡前刷手机,保证7—9小时高质量睡眠。每天10分钟专注呼吸,能增强前额叶对情绪的调控能力。若伴随持续情绪低落、兴趣丧失超过两周,需警惕抑郁可能,建议寻求专业评估。
网传的“前额叶受损”,折射出的是现代人对大脑的过度透支。大脑需要休息和营养,也需要被温柔对待。从今天起,少刷短视频多睡觉,给前额叶喘息的空间。守护好这个“总指挥”,才能更从容地应对生活的挑战。
(董恺,作者为首都医科大学附属北京安定医院精神神经联合病房副主任,本报记者王洲采访整理)
来源:人民日报
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