Experimental Neuropsychology Unit, Saarland University, Campus A2 4, D-66123 Saarbrücken, Germany.
Experimental Neuropsychology Unit, Saarland University, Campus A2 4, D-66123 Saarbrücken, Germany.
Brain Cogn. 2020 Dec;146:105635. doi: 10.1016/j.bandc.2020.105635. Epub 2020 Nov 12.
Successful source memory retrieval is assumed to rely on intact preretrieval processes, such as retrieval orientation (RO). RO is the specialized processing of retrieval cues, depending on the type of information, memory is searched for. In a previous study, a positive frontal slow wave RO ERP effect was interpreted as reflecting memory search for self-relevant information. However, such a functional interpretation is hampered by the use of retrieval strategies as a consequence of which target source information can be indirectly inferred from the correct classification of non-target source information. To overcome this limitation, the present study compared two types of source information (i.e. color or character information) by asking participants to remember details within each source type and thus enforcing the selective retrieval of target information. Consistent with previous research, a positive frontal ERP component (600-800 ms post-stimulus) differentiated between correct rejections in both tasks, probably reflecting memory search for self-relevant information. Moreover, the RO ERP effect was associated with better source memory performance, providing evidence for the beneficial effect of ROs for memory retrieval. This relationship might be covered in memory exclusion tasks due to non-target retrieval.
成功的源记忆检索被认为依赖于完整的预检索过程，例如检索定向（RO）。RO 是检索线索的专门处理，具体取决于要搜索的信息类型。在之前的一项研究中，正面缓慢的脑电波 RO ERP 效应被解释为反映了对自我相关信息的记忆搜索。然而，由于检索策略的使用，这种功能解释受到了阻碍，因此可以从正确分类非目标源信息间接推断目标源信息。为了克服这一限制，本研究通过要求参与者记住每种源类型内的详细信息，从而强制选择性地检索目标信息，比较了两种类型的源信息（即颜色或字符信息）。与之前的研究一致，在两个任务中，正面的 ERP 成分（刺激后 600-800 毫秒）区分了正确的拒绝，这可能反映了对自我相关信息的记忆搜索。此外，RO ERP 效应与更好的源记忆表现相关，为 RO 对记忆检索的有益影响提供了证据。由于非目标检索，这种关系可能在记忆排除任务中被掩盖。
