Yorio Alberto, Tabullo Angel, Wainselboim Alejandro, Barttfeld Pablo, Segura Enrique
Laboratorio de Biología del Comportamiento, Instituto de Biología y Medicina Experimental, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina.
Neurosci Lett. 2008 Oct 10;443(3):113-8. doi: 10.1016/j.neulet.2008.07.001. Epub 2008 Jul 5.
Event-related potentials (ERPs) correlates of two test criteria of an abstract category task were dissociated. In a stimulus equivalence task, 10 subjects observed pairs of figures presented serially in three conditions: reflexivity (generalized identity), equivalence (arbitrary derived relations from a previous training), and unrelated pairs. They were instructed to decide whether the second item in a pair matched or mismatched the first one. Participants' performance in reflexivity matching tests was faster and more accurate than in equivalence matching or mismatching responses. In the three conditions, an occipital P2, a frontal N2 and a parietal P3 ERP component were elicited. The earlier components P2 and N2 exhibited reflexivity matching effects, while the later component (P3) exhibited the only equivalence matching effect. In addition, the subtracted ERP components from unrelated minus identity and unrelated minus equivalence trials were computed within two time windows: 150-250ms (dN300) and 350-450ms (dN400). While both dN300 waves were not significantly different, the comparison of both dN400 waves showed statistical differences. Correlates of partially perceptual (but contextually abstract) concepts are elicited earlier than those of pure abstract concepts. These ERPs correlates of stimulus equivalence relation tests of semantic categories are in concordance with the behavioral data.
抽象类别任务的两个测试标准的事件相关电位（ERP）关联被区分开来。在一个刺激等效性任务中，10名受试者观察在三种条件下依次呈现的图形对：自反性（广义同一性）、等效性（来自先前训练的任意派生关系）和不相关对。他们被指示判断一对中的第二个项目与第一个项目是否匹配。参与者在自反性匹配测试中的表现比在等效性匹配或不匹配反应中更快且更准确。在这三种条件下，诱发了枕叶P2、额叶N2和顶叶P3 ERP成分。较早的成分P2和N2表现出自反性匹配效应，而较晚的成分（P3）仅表现出等效性匹配效应。此外，在两个时间窗口内计算了不相关减去同一性和不相关减去等效性试验的减去ERP成分：150 - 250毫秒（dN300）和350 - 450毫秒（dN400）。虽然两个dN300波没有显著差异，但两个dN400波的比较显示出统计学差异。部分感知（但上下文抽象）概念的关联比纯抽象概念的关联诱发得更早。这些语义类别的刺激等效关系测试的ERP关联与行为数据一致。
