Psychiatry Service Line, VA Medical Center, Minneapolis, MN 55417, United States.
Neurosci Lett. 2010 Apr 12;473(3):172-7. doi: 10.1016/j.neulet.2010.02.025. Epub 2010 Feb 20.
For sequential information, the first (primacy) and last (recency) items are better remembered than items in the middle of the sequence. The cognitive operations and neural correlates for the primacy and recency effects are unclear. In this paper, we investigate brain oscillations associated with these effects. MEG recordings were obtained on 19 subjects performing a modified Sternberg paradigm. Correlation analyses were performed between brain oscillatory activity and primacy and recency indices. Oscillatory activity during information maintenance, not encoding, was correlated with the primacy and recency effects. The primacy effect was associated with occipital post-desynchrony, and temporal post-synchrony. The recency effect was associated with parietal and temporal desynchrony. Differences were also observed according to the maintenance strategy. These data indicate that the primacy and recency effects are related to different neural, and likely cognitive, operations that are dependant on the strategy for information maintenance.
对于连续信息，序列的开头（首因效应）和结尾（近因效应）的项目比中间的项目更容易被记住。首因效应和近因效应的认知操作和神经相关物尚不清楚。在本文中，我们研究了与这些效应相关的脑振荡。使用修改后的 Sternberg 范式对 19 名受试者进行 MEG 记录。在大脑振荡活动与首因和近因指数之间进行了相关分析。信息维持期间的振荡活动，而不是编码期间的活动，与首因和近因效应相关。首因效应与枕部去同步化和颞部后同步化有关。近因效应与顶叶和颞叶去同步化有关。根据维持策略也观察到了差异。这些数据表明，首因和近因效应与不同的神经和可能的认知操作有关，这些操作取决于信息维持的策略。
