EXPECTANCY FOR EVENTS IN OLD-AGE - STIMULUS SEQUENCE EFFECTS ON P300 AND REACTION-TIME
EXPECTANCY FOR EVENTS IN OLD-AGE - STIMULUS SEQUENCE EFFECTS ON P300 AND REACTION-TIME
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DOI：
10.1093/geronj/37.6.696
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发表时间：
1982-01-01
期刊：
影响因子：
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通讯作者：
KOPELL, BS
中科院分区：
文献类型：
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作者：
FORD, JM;DUNCANJOHNSON, CC;KOPELL, BS
收集了10名年轻（M = 22岁）和10名老年（M = 77岁）女性的事件相关脑电位。刺激随机序列的1000和1500赫兹的音调在两个选择，被迫选择，反应时间任务。根据前四个音调的顺序对试验进行分类和平均：重复的继续（AAAAA）和交替（ABABA）以及重复的中断（BBBBA）和交替（BABAA）。对于两组的事件相关脑电位的P300组件是更大的，后来中断比继续。中断重复引起较大的P300比中断的交替，效果特别大的老年妇女。两组的平均反应时间没有差异，尽管老年组的P300潜伏期显著延长。结果进行了讨论，在年龄相关的反应策略和敏感性的p300潜伏期的反应策略的差异。
Event-related brain potentials were collected from 10 young (M = 22 years) and 10 elderly (M = 77 years) women. Stimuli were random sequences of 1000- and 1500-Hz tone pips in a two alternative, forced choice, reaction time task. Trials were sorted and averaged according to the sequence of the preceding four tones: continuations of repetitions (AAAAA) and alternations (ABABA) and discontinuations of repetitions (BBBBA) and alternations (BABAA). For both groups the P300 component of the event-related brain potentials was larger and later to discontinuations than continuations. Discontinuations of repetitions elicited larger P300s than did discontinuations of alternations, an effect especially large for the elderly women. Mean reaction time did not differ between the two groups, although P300 latencies were significantly longer for the elderly group. Results are discussed in terms of age-related differences in response strategies and sensitivity of p300 latency to response strategy.