Tag: Episodic Memory

Mechanisms of critical period in the hippocampus underlie object location learning and memory in infant rats

Published in: Learning & Memory, Volume 25, Issue 4, 176-182 Abstract “Episodic memories in early childhood are rapidly forgotten, a phenomenon that is associated with “infantile amnesia,” the inability of adults to remember early-life experiences. We recently showed that early aversive contextual memory in infant rats, which is in fact rapidly forgotten, is actually not lost, as reminders presented later in life reinstate a long-lasting and context-specific memory. We also showed that the formation of this infantile memory recruits in the hippocampus mechanisms typical of developmental critical periods. Here, we tested whether similar mechanisms apply to a nonaversive, hippocampal type of… Read More

Evidence for the use of three-way binding structures in associative and source recognition

Published in: Journal of Memory and Language, Volume 100, June 2018, 89-97 Abstract “Avoiding interference among similar memory traces may be helped by forming complex memory structures that include multiple components of the event. In a laboratory setting, these structures have been studied through list learning paradigms, where the pairs in one list are swapped in another list (i.e., ABABr condition), and one has to form a memory structure that includes items and context together (i.e., three-way binding). However, despite the long history of the theoretical concept, and its importance, three-way bindings have only been examined in recall paradigms. Moreover, not… Read More

The impact of perceptual changes to studied items on ERP correlates of familiarity and recollection is subject to hemispheric asymmetries

Published in: Brain and Cognition, Volume 122, April 2018, 17-25 Abstract “It is still unclear which role the right hemisphere (RH) preference for perceptually specific and the left hemisphere (LH) bias towards abstract memory representations play at the level of episodic memory retrieval. When stimulus characteristics hampered the retrieval of abstract memory representations, these hemispheric asymmetries have previously only modulated event-related potential (ERP) correlates of recollection (late positive complex, LPC), but not of familiarity (FN400). In the present experiment, we used stimuli which facilitated the retrieval of abstract memory representations. With the divided visual field technique, new items, identical repetitions and… Read More

Free recall dynamics in value-directed remembering

Published in: Journal of Memory and Language, Volume 100, June 2018, 18-31 Abstract “An emerging literature on value-directed remembering has shown that people are able to encode and remember information that is more important. Researchers operationalize importance by differentially assigning value to the memoranda that participants are asked to encode and remember. In the present investigation, a slightly altered value-directed-remembering paradigm was used to investigate how value modifies the dynamics of memory organization and search in free recall. In Experiment 1, free recall dynamics were compared between a control and a value condition. In Experiment 2, we manipulated the order of… Read More

The ERP correlates of self-knowledge: Are assessments of one’s past, present, and future traits closer to semantic or episodic memory?

Published in: Neuropsychologia, Volume 110, February 2018, 65-83 Abstract “Self-knowledge concerns one’s own preferences and personality. It pertains to the self (similar to episodic memory), yet does not concern events. It is factual (like semantic memory), but also idiosyncratic. For these reasons, it is unclear where self-knowledge might fall on a continuum in relation to semantic and episodic memory. In this study, we aimed to compare the event-related potential(ERP) correlates of self-knowledge to those of semantic and episodic memory, using N400 and Late Positive Component (LPC) as proxies for semantic and episodic processing, respectively. We considered an additional factor: time perspective. Temporally distant… Read More

Dynamic changes in large-scale functional network organization during autobiographical memory retrieval

Published in: Neuropsychologia, Volume 110, February 2018, 208-224 Abstract “Autobiographical memory (AM), episodic memory for life events, involves the orchestration of multiple dynamic cognitive processes, including memory access and subsequent elaboration. Previous neuroimaging studies have contrasted memory access and elaboration processes in terms of regional brain activation and connectivity within large, multi-region networks. Although interactions between key memory-related regions such as the hippocampus and prefrontal cortex (PFC) have been shown to play an important role in AM retrieval, it remains unclear how such connectivity between specific, individual regions involved in AM retrieval changes dynamically across the retrieval process and how these changes relate to broader memory networks throughout… Read More

Best not to bet on the horserace: A comment on Forrin and MacLeod (2017) and a relevant stimulus-response compatibility view of colour-word contingency learning asymmetries

Published in: Memory & Cognition, Volume 46, Issue 2, 326-335 Abstract “One powerfully robust method for the study of human contingency learning is the colour-word contingency learning paradigm. In this task, participants respond to the print colour of neutral words, each of which is presented most often in one colour. The contingencies between words and colours are learned, as indicated by faster and more accurate responses when words are presented in their expected colour relative to an unexpected colour. In a recent report, Forrin and MacLeod (2017b, Memory & Cognition) asked to what extent this performance (i.e., response time) measure of learning… Read More

Gamma phase-synchrony in autobiographical memory: Evidence from magnetoencephalography and severely deficient autobiographical memory

Published in: Neuropsychologia, Volume 110, February 2018, 7-13 Abstract “The subjective sense of recollecting events from one’s past is an essential feature of episodic memory, but the neural mechanisms supporting this capacity are poorly understood. We examined the role of large-scale patterns of neural synchrony using whole-head MEG recordings in healthy adults and S.M., who has severely deficient autobiographical memory (SDAM; Palombo et al., 2015), a syndrome in which autobiographical recollection is absent but other functions (including other mnemonic functions), are normal. MEG was conducted while participants listened to prospectively collected recordings documenting unique personal episodes (PE) that normally evoke rich recollection, as well as a condition including… Read More

Narrative construction is intact in episodic amnesia

Published in: Neuropsychologia, Volume 110, February 2018, 104-112 Abstract “Autobiographical remembering and future imagining overlap in their underlying psychological and neurological mechanisms. The hippocampus and surrounding regions within the medial temporal lobes (MTL), known for their role in forming and maintaining autobiographical episodic memories, are also thought to play an essential role in fictitious and future constructions. Amnesic individuals with bilateral hippocampal damage cannot reconstruct their past personal experiences and also have severe deficits in the ability to construct coherent fictitious or future narratives. However, it is not known whether this impairment reflects a failure to generate details from autobiographical episodic memory to populate personal narratives or an… Read More

Search and recovery of autobiographical and laboratory memories: Shared and distinct neural components

Published in: Neuropsychologia, Volume 110, February 2018, 44-54 Abstract “Functional neuroimaging evidence suggests that there are differences in the neural correlates of episodic memory for laboratory stimuli (laboratory memory) and for events from one’s own life (autobiographical memory). However, this evidence is scarce and often confounded with differences in memory testing procedures. Here, we directly compared the neural mechanisms underlying the search and recovery of autobiographical and laboratory memories while minimizing testing differences. Before scanning, participants completed a laboratory memory encoding task in which they studied four-word “chains” spread across three word pairs. During scanning, participants completed a laboratory memory retrieval task, in which they… Read More