Wylie Glenn R, Foxe John J, Taylor Tracy L
Department of Physical Medicine and Rehabilitation Kessler Medical Rehabilitation Research and Education Center, West Orange, NJ 07052, USA.
Cereb Cortex. 2008 Mar;18(3):670-82. doi: 10.1093/cercor/bhm101. Epub 2007 Jul 7.
Using event-related functional magnetic resonance imaging (fMRI), we examined the blood oxygen level-dependent response associated with intentional remembering and forgetting. In an item-method directed forgetting paradigm, participants were presented with words, one at a time, each of which was followed after a brief delay by an instruction to Remember or Forget. Behavioral data revealed a directed forgetting effect: greater recognition of to-be-remembered than to-be-forgotten words. We used this behavioral recognition data to sort the fMRI data into 4 conditions based on the combination of memory instruction and behavioral outcome. When contrasted with unintentional forgetting, intentional forgetting was associated with increased activity in hippocampus (Broadmann area [BA] 35) and superior frontal gyrus (BA10/11); when contrasted with intentional remembering, intentional forgetting was associated with activity in medial frontal gyrus (BA10), middle temporal gyrus (BA21), parahippocampal gyrus (BA34 and 35), and cingulate gyrus (BA31). Thus, intentional forgetting depends on neural structures distinct from those involved in unintentional forgetting and intentional remembering. These results challenge the standard selective rehearsal account of item-method directed forgetting and suggest that frontal control processes may be critical for directed forgetting.
我们使用事件相关功能磁共振成像(fMRI)技术,研究了与有意记忆和遗忘相关的血氧水平依赖反应。在项目法指向性遗忘范式中,向参与者逐一呈现单词,每个单词短暂延迟后会出现“记住”或“忘记”的指令。行为数据显示出指向性遗忘效应:对要记住的单词的识别率高于要忘记的单词。我们根据记忆指令和行为结果的组合,利用这些行为识别数据将fMRI数据分为四种情况。与无意遗忘相比,有意遗忘与海马体(布罗德曼区[BA]35)和额上回(BA10/11)活动增加有关;与有意记忆相比,有意遗忘与额内侧回(BA10)、颞中回(BA21)、海马旁回(BA34和35)和扣带回(BA31)的活动有关。因此,有意遗忘依赖于与无意遗忘和有意记忆所涉及的神经结构不同的神经结构。这些结果挑战了项目法指向性遗忘的标准选择性复述理论,并表明额叶控制过程可能对指向性遗忘至关重要。