Associative Activation and Its Relation to Exploration and Exploitation in the Brain
Associative Activation and Its Relation to Exploration and Exploitation in the Brain
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DOI：
10.1177/0956797616634487
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发表时间：
2016-06-01
影响因子：
8.2
通讯作者：
Bar, Moshe
中科院分区：
文献类型：
--
作者：
Baror, Shira;Bar, Moshe
通常假设关联激活依赖于关联强度，使得如果A与B强关联，则每当A被激活时，B被激活。我们通过研究关联的激活是否依赖于状态来挑战这一假设。在三个实验中，受试者进行了自由联想任务，同时以各种方式操纵的同时负荷的水平。在所有三个实验中，与高负荷条件下的受试者相比，低负荷条件下的受试者提供了显着更多样化和原始的关联，这些受试者表现出高度的共识。在另一个实验中，我们发现增加语义启动的即时协会在高负荷和远程协会在低负荷。两者合计，这些研究结果意味着，激活的协会是一个探索性的过程默认情况下，但缩小到利用更直接的协会在高负荷的条件下。我们提出了一个潜在的机制，处理协会的探索和开发模式，并提出临床意义。
Associative activation is commonly assumed to rely on associative strength, such that if A is strongly associated with B, B is activated whenever A is activated. We challenged this assumption by examining whether the activation of associations is state dependent. In three experiments, subjects performed a free-association task while the level of a simultaneous load was manipulated in various ways. In all three experiments subjects in the low-load conditions provided significantly more diverse and original associations compared with subjects in the high-load conditions, who exhibited high consensus. In an additional experiment, we found increased semantic priming of immediate associations under high load and of remote associations under low load. Taken together, these findings imply that activation of associations is an exploratory process by default, but is narrowed to exploiting the more immediate associations under conditions of high load. We propose a potential mechanism for processing associations in exploration and in exploitation modes, and suggest clinical implications.