Lavigne Frédéric, Chanquoy Lucile, Dumercy Laurent, Vitu Françoise
Laboratoire Bases, Corpus, Langage, UMR 7320, CNRS and Université de Nice-Sophia Antipolis, France.
Adv Cogn Psychol. 2013 Jan 1;9(1):1-14. doi: 10.2478/v10053-008-0126-9. Print 2013.
Semantic processing of sequences of words requires the cognitive system to keep several word meanings simultaneously activated in working memory with limited capacity. The real- time updating of the sequence of word meanings relies on dynamic changes in the associates to the words that are activated. Protocols involving two sequential primes report a semantic priming shift from larger priming of associates to the first prime to larger priming of associates to the second prime, in a range of long SOAs (stimulus-onset asynchronies) between the second prime and the target. However, the possibility for an early semantic priming shift is still to be tested, and its dynamics as a function of association strength remain unknown. Three multiple priming experiments are proposed that cross-manipulate association strength between each of two successive primes and a target, for different values of short SOAs and prime durations. Results show an early priming shift ranging from priming of associates to the first prime only to priming of strong associates to the first prime and all of the associates to the second prime. We investigated the neural basis of the early priming shift by using a network model of spike frequency adaptive cortical neurons (e.g., Deco & Rolls, 2005), able to code different association strengths between the primes and the target. The cortical network model provides a description of the early dynamics of the priming shift in terms of pro-active and retro-active interferences within populations of excitatory neurons regulated by fast and unselective inhibitory feedback.
对单词序列进行语义处理需要认知系统在容量有限的工作记忆中同时激活多个单词的含义。单词含义序列的实时更新依赖于与被激活单词相关联的动态变化。涉及两个连续启动刺激的实验方案表明，在第二个启动刺激与目标之间的一系列长刺激起始异步（SOA）条件下，语义启动效应从对第一个启动刺激的关联项的较大启动效应转变为对第二个启动刺激的关联项的较大启动效应。然而，早期语义启动效应转变的可能性仍有待检验，并且其作为关联强度函数的动态变化仍然未知。我们提出了三个多重启动实验，针对不同的短SOA值和启动刺激持续时间，交叉操纵两个连续启动刺激与一个目标之间的关联强度。结果显示了早期启动效应的转变，从仅对第一个启动刺激的关联项的启动效应，转变为对第一个启动刺激的强关联项以及对第二个启动刺激的所有关联项的启动效应。我们通过使用一个尖峰频率自适应皮层神经元的网络模型（例如，Deco & Rolls，2005）来研究早期启动效应转变的神经基础，该模型能够编码启动刺激与目标之间不同的关联强度。皮层网络模型根据由快速且非选择性抑制性反馈调节的兴奋性神经元群体内的前向和反向干扰，对启动效应转变的早期动态变化进行了描述。
