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TDCS and memory

Wen-Juan Yang, Hui-Zhong Wen, Lu-Xu Zhou, Yin-Pei Luo, Wen-Sheng Hou, Wang Xing, Xue-Long Tian
Repetitive anodal transcranial direct current stimulation (tDCS) in a rat model of Alzheimer's disease (AD) has been shown to have distinct neuroprotective effects. Moreover, the effects of anodal tDCS not only occur during the stimulation but also persist after the stimulation has ended (after-effects). Here, the duration of the after-effects induced by repetitive anodal tDCS was investigated based on our previous studies. Adult male Sprague-Dawley rats were divided into three groups: a sham group, a β-amyloid (Aβ) group (AD group) and a stimulation group (ATD group)...
February 5, 2019: Neurobiology of Learning and Memory
Vanteemar S Sreeraj, Venkataram Shivakumar, Anushree Bose, Purohit N Abhiram, Sri Mahavir Agarwal, Harleen Chhabra, Janardhanan C Narayanaswamy, Ganesan Venkatasubramanian
Transcranial direct current stimulation (tDCS) is a novel brain stimulation technique which has kindled hope in alleviating motor, language as well as cognitive deficits in neuronal injury. Current case report describes application of tDCS in two phases using two different protocols in a patient with hypoxic injury. In the first phase anodal stimulation of dorsolateral prefrontal cortex improved the language fluency. Subsequently, after 6 months second phase application of anodal stimulation over posterior parietal region targeted arithmetic and working memory deficits...
February 28, 2019: Clinical Psychopharmacology and Neuroscience: the Official Scientific Journal of the Korean College of Neuropsychopharmacology
G Nathzidy Rivera-Urbina, María Fernanda Mendez Joya, Michael A Nitsche, Andrés Molero-Chamizo
BACKGROUND: Wernicke's area is a key component of the cortical language network, and it is functionally related to the comprehension of oral and written language. In addition to its main role in the perception of language, some other functions related to verbal learning also seem to involve the activity of this cortical region. It is unknown whether different degrees of neuromodulation on this area determine its effect on word learning. OBJECTIVE: We aimed to analyze the influence of the application of anodal transcranial DC stimulation (tDCS) over Wernicke's area at two different intensities on word learning...
January 21, 2019: Neuropsychology
Mohaddeseh Hafez Yosephi, Fatemeh Ehsani, Maryam Daghiani, Maryam Zoghi, Shapour Jaberzadeh
Intensifying fear and fear of pain may lead to some diseases such as panic disorder, phobias, post-traumatic stress disorder (PTSD), anxiety disorders, depression, etc. A number of studies indicated positive effect of transcranial direct current stimulation (tDCS) on controlling fear and some studies did not observe any effect or even negative effect on decreasing fear. Due to lack of consensus in the findings of research, we aimed to systematically review studies, which investigated the effect of tDCS on fear...
January 16, 2019: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
M R L Emonson, P B Fitzgerald, N C Rogasch, K E Hoy
Transcranial direct current stimulation (tDCS) has been investigated as a way to improve motor and cognitive functioning, with largely variable results. Currently, relatively little is known about the neurobiological effects, and possible drivers of variability, in either healthy or clinical populations. Therefore, this study aimed to characterise the neurobiological effects to tDCS in younger adults, older adults and adults with mild cognitive impairment (MCI), and their relationship to cognitive performance...
January 6, 2019: Neuropsychologia
Sun-Young Moon, Minah Kim, Wu Jeong Hwang, Tae Young Lee, Jun Soo Kwon
Transcranial direct current stimulation (tDCS) exerts pro-cognitive effects in various populations. We evaluated the effect of tDCS on cognitive performance and its electrophysiological correlates in schizophrenia patients. Ten participants received 10 sessions of tDCS and performed cognitive performance tasks; error-related negativity and correct response negativity (CRN) were measured before and after tDCS. Verbal performance was improved by tDCS and strongly correlated with a reduced CRN amplitude. Despite the lack of sham control design and possible practice effects of cognitive tasks, we might conclude that CRN could be a modifiable electrophysiological correlate of cognitive improvement by tDCS...
December 31, 2018: Psychiatry research. Neuroimaging
Zoha Deldar, Nabi Rustamov, Isabelle Blanchette, Mathieu Piché
The aim of the present study was to examine whether transcranial Direct Current Stimulation (tDCS) could enhance working memory and pain inhibition in older persons. Fifteen volunteers (7 women, 8 men; mean ± SD: 64 ± 4.4 y.o.) participated in two tDCS sessions during which an n-back task was performed with two levels of working memory load, while painful stimulation was delivered at the ankle. The experiment included five within-subject counterbalanced conditions (pain alone and 0-back or 2-back with or without pain) performed twice during each session...
January 4, 2019: Neuroscience Research
Aron T Hill, Nigel C Rogasch, Paul B Fitzgerald, Kate E Hoy
Transcranial direct current stimulation (tDCS) provides a means of non-invasively inducing plasticity-related changes in neural circuits in vivo and is experiencing increasing use as a potential tool for modulating brain function. There is growing evidence that tDCS-related outcomes are likely to be influenced by an individual's brain state at the time of stimulation, i.e., effects show a degree of 'state-dependency'. However, few studies have examined the behavioural and physiological impact of state-dependency within cognitively salient brain regions...
December 7, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
Renée S Koolschijn, Uzay E Emir, Alexandros C Pantelides, Hamed Nili, Timothy E J Behrens, Helen C Barron
Our experiences often overlap with each other, yet we are able to selectively recall individual memories to guide decisions and future actions. The neural mechanisms that support such precise memory recall remain unclear. Here, using ultra-high field 7T MRI we reveal two distinct mechanisms that protect memories from interference. The first mechanism involves the hippocampus, where the blood-oxygen-level-dependent (BOLD) signal predicts behavioral measures of memory interference, and representations of context-dependent memories are pattern separated according to their relational overlap...
December 14, 2018: Neuron
Guillermo Borragán, Médhi Gilson, Carlos Guerrero-Mosquera, Eleonora Di Ricci, Hichem Slama, Philippe Peigneux
Sustained cognitive demands may result in cognitive fatigue (CF), eventually leading to decreased behavioral performance and compromised brain resources. In the present study, we tested the hypothesis that transcranial direct current stimulation (tDCS) would counteract the behavioral and neurophysiological effects of CF. Twenty young healthy participants were tested in a within-subject counterbalanced order across two different days. Anodal tDCS (real vs. sham) was applied over the left prefrontal cortex. In the real tDCS condition, a current of 1...
2018: Frontiers in Psychology
Bjekić Jovana, Čolić V Marija, Živanović Marko, Milanović D Sladjan, Filipović R Saša
Associative memory plays a key role in everyday functioning, but it declines with normal aging as well as due to various pathological states and conditions, thus impairing quality of life. Associative memory enhancement via neurostimulation over frontal areas resulted in limited success, while posterior stimulation sites seemed to be more promising. We hypothesized that anodal transcranial direct current stimulation (tDCS) of parietal areas would lead to higher performance in associative memory due to high connectivity between posterior parietal cortex (PPC) and hippocampus...
December 12, 2018: Neurobiology of Learning and Memory
Elena M Marron, Raquel Viejo-Sobera, Guillem Cuatrecasas, Diego Redolar-Ripoll, Pilar García Lorda, Abhishek Datta, Marom Bikson, Greta Magerowski, Miguel Alonso-Alonso
Human neuroimaging studies have consistently reported changes in cerebellar function and integrity in association with obesity. To date, however, the nature of this link has not been studied directly. Emerging evidence suggests a role for the cerebellum in higher cognitive functions through reciprocal connections with the prefrontal cortex. The purpose of this exploratory study was to examine appetite changes associated with noninvasive prefronto-cerebellar neuromodulation in obesity. Totally, 12 subjects with class I obesity (mean body mass index 32...
December 11, 2018: International Journal of Obesity: Journal of the International Association for the Study of Obesity
Giulia Galli, Miguel A Vadillo, Miroslav Sirota, Matteo Feurra, Angela Medvedeva
BACKGROUND: In the past decade, several studies have examined the effects of transcranial direct current stimulation (tDCS) on long-term episodic memory formation and retrieval. These studies yielded conflicting results, likely due to differences in stimulation parameters, experimental design and outcome measures. OBJECTIVES: In this work we aimed to assess the robustness of tDCS effects on long-term episodic memory using a meta-analytical approach. METHODS: We conducted four meta-analyses to analyse the effects of anodal and cathodal tDCS on memory accuracy and response times...
November 17, 2018: Brain Stimulation
Hussien Ahmed Shaker, Salah Abd Elmonem Sawan, Ebtesam Mohamed Fahmy, Rania Shehata Ismail, Shymaa Abd Elhamid Abd Elrahman
Background: Cognitive impairment after stroke is common and can cause disability with major impacts on quality of life and independence. Transcranial direct current stimulation may represent a promising tool for reconstitution of cognitive functions in stroke patients. Objectives: This study aimed to investigate the effect of transcranial direct current stimulation on cognitive functions in stroke patients. Patients and methods: Forty male stroke patients were included...
2018: The Egyptian journal of neurology, psychiatry and neurosurgery
Sisi Wang, Sirawaj Itthipuripat, Yixuan Ku
Visual short-term memory (VSTM) provides an on-line mental space for incoming sensory information to be temporally maintained to carry out complex behavioral tasks. Despite its essential functions, the capacity at which VSTM could maintain sensory information is limited (i.e., VSTM can hold only about three to four visual items at once). Moreover, the quality of sensory representation (i.e., precision) degrades as more information has to be maintained in VSTM. Correlational evidence suggests that the level and the pattern of neural activity measured in the posterior parietal cortex (PPC) track both VSTM capacity and precision...
January 16, 2019: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
Ting-Hsuan Yu, Yi-Jen Wu, Miao-Er Chien, Kuei-Sen Hsu
Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique used to modulate neuronal excitability via externally applied electric fields. Despite the positive effects of tDCS in a wide range of neurological disorders in humans, its mechanism of action remains poorly understood. Here we investigated cellular and molecular mechanisms underlying the aftereffects of anodal tDCS on the induction of long-term potentiation (LTP), a cellular correlate of learning and memory, at Schaffer collateral-CA1 synapses...
November 12, 2018: Neuropharmacology
Laurence Dumont, Sofia El Mouderrib, Hugo Théoret
BACKGROUND: Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique commonly used to modulate cognitive functions; so-called "anodal" stimulation is considered to increase cortical excitability while "cathodal" is presumed to have the opposite result. Yet, a growing number of recent studies question the robustness of this polarity-dependent effect, namely because of the important inter-individual variability with regards to tDCS modulatory effects...
November 3, 2018: Restorative Neurology and Neuroscience
Franziska Röhner, Carolin Breitling, Katharina S Rufener, Hans-Jochen Heinze, Hermann Hinrichs, Kerstin Krauel, Catherine M Sweeney-Reed
Transcranial electrical stimulation (TES) has been considered a promising tool for improving working memory (WM) performance. Recent studies have demonstrated modulation of networks underpinning WM processing through application of transcranial alternating current (TACS) as well as direct current (TDCS) stimulation. Differences between study designs have limited direct comparison of the efficacy of these approaches, however. Here we directly compared the effects of theta TACS (6 Hz) and anodal TDCS on WM, applying TACS to the frontal-parietal loop and TDCS to the dorsolateral prefrontal cortex (DLPFC)...
2018: Frontiers in Neuroscience
Bryant J Jongkees, Alexandra A Loseva, Fatemeh B Yavari, Michael A Nitsche, Lorenza S Colzato
Transcranial direct current stimulation (tDCS) can alter cortical excitability, neural plasticity and cognitive-behavioral performance, however its effects are known to vary across studies. A partial account of this variability relates to individual differences in dopamine function. Indeed, dopaminergic manipulations alter the physiological and cognitive-behavioral effects of tDCS, and gene polymorphisms related to dopamine have predicted individual response to online tDCS (i.e., stimulation overlapping with the critical task)...
November 7, 2018: European Journal of Neuroscience
Pablo Cruz Gonzalez, Kenneth N K Fong, Raymond C K Chung, Kin-Hung Ting, Lawla L F Law, Ted Brown
Background: Transcranial direct-current stimulation (tDCS) facilitates cognitive improvement in healthy and pathological populations. It has been increasingly used in cases of mild cognitive impairment (MCI) and dementia. Our research question is: Can tDCS serve as a clinical intervention for improving the cognitive functions of persons with MCI (PwMCI) and dementia (PwD)? Objective: This systematic review evaluated the evidence to determine the efficacy of tDCS in improving cognitive outcomes in PwD and PwMCI...
2018: Frontiers in Human Neuroscience
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