Institute of Cognitive Neuroscience and Psychology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Hungary.
Clin Neurophysiol. 2013 Oct;124(10):1986-94. doi: 10.1016/j.clinph.2013.04.017. Epub 2013 May 26.
To explore age-, and valence specific ERP-characteristics of word-discrimination processes.
A group of young (mean age: 21.26 yrs) and elderly (mean age: 65.73 yrs) individuals participated. The task was to respond to a word (target) with valence (neutral, negative, positive) and disregard others (non-target) with a different valence. Behavioral indices and the N4 and late positive complex (LPC) components were analyzed.
For words with negative valence performance was better for non-target stimuli in the young. Higher N4 was elicited by negative non-target words in the fronto-central areas. Target words elicited a P3b-like LPC in the young while a P3a-like LPC was observed in the elderly.
The findings indicate that inhibition elicited by aversive events is observed for word stimuli as well, and is most effective in the young.
The effect of valence during emotional word discrimination shows age-dependent differences reflected by ERPs.
探讨年龄和效价特异性的词辨别过程中的事件相关电位（ERP）特征。
一组年轻人（平均年龄：21.26 岁）和老年人（平均年龄：65.73 岁）参与了研究。任务是对具有不同效价的词（目标）做出反应，并忽略其他具有不同效价的词（非目标）。分析了行为指标和 N4 和晚期正性复合（LPC）成分。
对于具有负性效价的词，年轻人对非目标刺激的反应更好。在额中央区域，负性非目标词诱发了更高的 N4。目标词在年轻人中诱发了类似于 P3b 的 LPC，而在老年人中则观察到类似于 P3a 的 LPC。
这些发现表明，对厌恶事件的抑制也在词刺激中观察到，并且在年轻人中最为有效。
情绪词辨别过程中的效价影响表现出年龄依赖性差异，这在 ERPs 中得到了反映。
