注意力不集中？喝咖啡真的有效吗？
<p><span word="Central">Central</span> <span word="nervous">nervous</span> <span word="system">system</span> <span word="stimulant">stimulant</span> <span word="medicines">medicines</span> <span word="are">are</span> <span word="the">the</span> <span word="most">most</span> <span word="commonly">commonly</span> <span word="prescribed">prescribed</span> <span word="medications">medications</span> <span word="to">to</span> <span word="treat">treat</span> <span word="symptoms">symptoms</span> <span word="of">of</span> <span word="attention">attention</span> <span word="deficit">deficit</span>/<span word="hyperactivity">hyperactivity</span> <span word="disorder">disorder</span> (<span word="ADHD">ADHD</span>). <span word="These">These</span> <span word="stimulants">stimulants</span> <span word="activate">activate</span> <span word="the">the</span> <span word="level">level</span> <span word="of">of</span> <span word="activity">activity</span>, <span word="arousal">arousal</span>, <span word="or">or</span> <span word="alertness">alertness</span> <span word="of">of</span> <span word="the">the</span> <span word="central">central</span> <span word="nervous">nervous</span> <span word="system">system</span>. <span word="They">They</span> <span word="work">work</span> <span word="by">by</span> “<span word="stimulating">stimulating</span>” <span word="and">and</span> <span word="increasing">increasing</span> <span word="the">the</span> <span word="availability">availability</span> <span word="of">of</span> <span word="certain">certain</span> <span word="neurotransmitters">neurotransmitters</span> <span word="in">in</span> <span word="the">the</span> <span word="brain">brain</span>, <span word="making">making</span> <span word="pathways">pathways</span> <span word="in">in</span> <span word="the">the</span> <span word="brain">brain</span> <span word="work">work</span> <span word="more">more</span> <span word="effectively">effectively</span>.</p><p>中枢神经系统兴奋剂是治疗注意性缺障碍症（多动症）的一剂常用良方。这些兴奋剂提升了人们控制行为的能力，唤醒并使中枢神经系统处于警觉状态。这些药物的主要职能是“刺激”并增加大脑中某些神经递质的能动性，让大脑工作的效率更高。</p><p><span word="All">All</span> <span word="three">three</span> <span word="subtypes">subtypes</span> <span word="of">of</span> <span word="ADHD">ADHD</span> -- <span word="the">the</span> <span word="Combined">Combined</span> <span word="type">type</span>, <span word="the">the</span> <span word="Predominantly">Predominantly</span> <span word="Hyperactive">Hyperactive</span>-<span word="Impulsive">Impulsive</span> <span word="type">type</span>, <span word="and">and</span> <span word="the">the</span> <span word="Predominantly">Predominantly</span> <span word="Inattentive">Inattentive</span> <span word="type">type</span> -- <span word="respond">respond</span> <span word="to">to</span> <span word="stimulant">stimulant</span> <span word="therapy">therapy</span>.</p><p>共有三种亚型多动症：组合型多动症，冲动型多动症以及完全无法集中注意力为主要特征的多动症——刺激疗法都可以奏效。</p><p><span word="Caffeine">Caffeine</span> <span word="is">is</span> <span word="also">also</span> <span word="a">a</span> <span word="central">central</span> <span word="nervous">nervous</span> <span word="system">system</span> <span word="stimulant">stimulant</span>. <span word="Is">Is</span> <span word="caffeine">caffeine</span> <span word="an">an</span> <span word="alternative">alternative</span> <span word="therapeutic">therapeutic</span> <span word="strategy">strategy</span> <span word="for">for</span> <span word="the">the</span> <span word="management">management</span> <span word="of">of</span> <span word="ADHD">ADHD</span> <span word="symptoms">symptoms</span>? <span word="Can">Can</span> <span word="a">a</span> <span word="few">few</span> <span word="cups">cups</span> <span word="of">of</span> <span word="coffee">coffee</span> <span word="a">a</span> <span word="day">day</span> <span word="effectively">effectively</span> <span word="improve">improve</span> <span word="mental">mental</span> <span word="focus">focus</span> <span word="and">and</span> <span word="attention">attention</span> <span word="and">and</span> <span word="reduce">reduce</span> <span word="impulsive">impulsive</span> <span word="or">or</span> <span word="hyperactive">hyperactive</span> <span word="behavior">behavior</span> <span word="in">in</span> <span word="children">children</span> <span word="with">with</span> <span word="ADHD">ADHD</span>?</p><p>咖啡因也是中枢神经系统兴奋剂的一种。但这就意味着咖啡因能在治疗多动症方面取代药物么？一天喝几杯咖啡，我们就能集中注意力于工作了吗？也能使罹患多动症的儿童行为有所改善吗？</p>
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