Asymmetries of prefrontal cortex in human episodic memory: effects of transcranial magnetic stimulation on learning abstract patterns

Epstein, Charles M.; Sekino, Masaki; Yamaguchi, Katsuya; Kamiya, Shinichiro; Ueno, S.

doi:10.1016/s0304-3940(01)02573-3

Cited by 67 publications

(42 citation statements)

References 18 publications

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“…on the other hand, several authors [37] reported that the right DLPFC, but not the left, contributes to the encoding of visual-object associations [38] and the left but not the right DLPFC plays a crucial role in the encoding of verbal material [36,37] , supporting the theories of material specificity. Several studies provide evidence for the hypothesis called the "valence model", which states that withdrawal-related emotions are located in the right hemisphere whereas approach-related emotions are biased to the left hemisphere [36,38] .…”

Section: Episodic Memory and Tmsmentioning

confidence: 85%

“…Several studies provide evidence for the hypothesis called the "valence model", which states that withdrawal-related emotions are located in the right hemisphere whereas approach-related emotions are biased to the left hemisphere [36,38] . Focusing on the TMS technique, Balconi et al [39,40] found an increased facilitation of the retrieval of positive emotional cues (in terms of reduced response times) under stimulation of the left DLPFC during the retrieval phase.…”

Section: Episodic Memory and Tmsmentioning

confidence: 99%

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Dorsolateral prefrontal cortex, working memory and episodic memory processes: insight through transcranial magnetic stimulation techniques

Balconi

2013

Neurosci. Bull.

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The ability to recall and recognize facts we experienced in the past is based on a complex mechanism in which several cerebral regions are implicated. Neuroimaging and lesion studies agree in identifying the frontal lobe as a crucial structure for memory processes, and in particular for working memory and episodic memory and their relationships. Furthermore, with the introduction of transcranial magnetic stimulation (TMS) a new way was proposed to investigate the relationships between brain correlates, memory functions and behavior. The aim of this review is to present the main findings that have emerged from experiments which used the TMS technique for memory analysis. They mainly focused on the role of the dorsolateral prefrontal cortex in memory process. Furthermore, we present state-of-the-art evidence supporting a possible use of TMS in the clinic. Specifically we focus on the treatment of memory deficits in depression and anxiety disorders.

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Section: Episodic Memory and Tmsmentioning

confidence: 85%

Section: Episodic Memory and Tmsmentioning

confidence: 99%

Dorsolateral prefrontal cortex, working memory and episodic memory processes: insight through transcranial magnetic stimulation techniques

Balconi

2013

Neurosci. Bull.

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“…RTMS was delivered over the right DLPFC, the left DLPFC and the occipital cortex by using a high frequency magnetic stimulator (Magstim Rapid, The Magstim Company Ltd., Whitland, UK) connected to a standard Magstim figure-of-eight coil. The DLPFC is a broad area; we used a site similar to that used by other research groups using TMS [8,19]. The coil was placed 5 cm anterior from the hand motor area on the left and right hemispheres and held parallel to the midsagittal line.…”

Section: T R a C Tmentioning

confidence: 99%

Theta burst stimulation of dorsolateral prefrontal cortex modulates pathological language switching: A case report

Nardone

Blasi

Bergmann

et al. 2011

Neuroscience Letters

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“…One such is that the main determinant of the hemispheric involvement in memory tasks is the type of to-be-remembered materials, and processes such as encoding and retrieval serve at best only to modulate such determination [1,8,9,13,14,18]. Another is that the hemispheric asymmetry between encoding and retrieval is apparent only: it might reflect nothing more than the asymmetry between the more verbally oriented processing during encoding and the less verbally oriented processing during retrieval [11,12,22].…”

Section: Process and Materials Asymmetriesmentioning

confidence: 99%

“…Recently, however, it has been suggested [8][9][10][11][12][13][14] that the asymmetry of PFC activations might reflect the nature of the materials involved in the comparison tasks (verbal versus non-verbal) rather than the memory processes (encoding versus retrieval). In light of these recent challenges, it is timely to re-evaluate the situation.…”

mentioning

confidence: 99%

Hemispheric asymmetries of memory: the HERA model revisited

Habib

Nyberg

Tulving

2003

Trends in Cognitive Sciences

358

197

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The hemispheric encoding/retrieval asymmetry (HERA) model is a process-specific description of experimental data provided by a large set of functional neuroimaging studies. According to HERA, left prefrontal cortex (PFC) is more involved than right PFC in episodic memory encoding, whereas right PFC is more involved than left PFC in episodic memory retrieval. Recently it has been claimed that this description does not hold for nonverbal materials. Here we propose a more precise formulation of HERA than previously, and argue that there is sufficient evidence to conclude that HERA, as reformulated, is true for both verbal and non-verbal materials.It has been known for some time now that structures within the two cerebral hemispheres do not contribute equally to mental activity [1]. The best known form of such hemispheric asymmetry is language: the left hemisphere is more involved in verbal processing than is the right. A more recent addition to the list of hemispheric asymmetries, although limited to the frontal regions of the brain, emerged from early PET studies of memory, and had to do with component processes of memory. Data from numerous studies showed that during learning of new material (encoding), left PFC tended to be more active than right PFC, whereas during a subsequent recall or recognition test (retrieval), right PFC tended to be more active than left PFC. This general pattern of data, initially based only on a handful of studies [2,3], was dubbed the Hemispheric Encoding/Retrieval Asymmetry (HERA) model. Figure 1 illustrates the HERA asymmetry with data from a single study.Although exceptions to HERA have been reported, numerous PET and fMRI studies have confirmed the existence of the general HERA pattern (for reviews see [4 -7]). Recently, however, it has been suggested [8][9][10][11][12][13][14] that the asymmetry of PFC activations might reflect the nature of the materials involved in the comparison tasks (verbal versus non-verbal) rather than the memory processes (encoding versus retrieval). In light of these recent challenges, it is timely to re-evaluate the situation. We propose a more precise formulation of HERA, and argue that the challenges to it are based on confusion about what HERA is, and about what kinds of data are, and are not, relevant to it. HERA revisedThe confusion is partly attributable to the looseness of the early formulation of HERA, and partly to subtleties of the relations involved. Here, in keeping with similar suggestions [10,15], we propose a stricter formulation of HERA. We suggest that the neuroanatomical data relevant to HERA should be based on a direct comparison of the two processes involved, with other variables, including materials, held constant.Let us abbreviate encoding as Enc, retrieval as Ret, a given site in left PFC as L, and the corresponding site in right PFC as R. And let us use the combination of tasks (Enc or Ret) and sites (L or R) to represent the level of (indirectly) measured neuronal activity at a given site in a given task.Then the encoding compon...

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Asymmetries of prefrontal cortex in human episodic memory: effects of transcranial magnetic stimulation on learning abstract patterns

Cited by 67 publications

References 18 publications

Dorsolateral prefrontal cortex, working memory and episodic memory processes: insight through transcranial magnetic stimulation techniques

Dorsolateral prefrontal cortex, working memory and episodic memory processes: insight through transcranial magnetic stimulation techniques

Theta burst stimulation of dorsolateral prefrontal cortex modulates pathological language switching: A case report

Hemispheric asymmetries of memory: the HERA model revisited

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