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TDCS and memory

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 online mental space for incoming sensory information to be temporally maintained in order 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 3-4 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...
November 20, 2018: 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
Athanasia Alexoudi, Panayiotis Patrikelis, Theodoros Fasilis, Spyros Deftereos, Damianos Sakas, Stylianos Gatzonis
PURPOSE: Multiple system atrophy (MSA) is a progressive neurodegenerative disease characterized by postural instability, autonomic failure, cerebellar ataxia, and cognitive deficits. There is currently no effective cure. Transcranial direct current stimulation (tDCS), offers promise in amendment of motor, and cognitive performance in advanced Parkinson's disease. CASE DESCRIPTION: We estimated the effect of anodal tDCS on motor and cognitive function in a 66-year-old woman with moderate MSA...
October 21, 2018: Disability and Rehabilitation
J P Lindenmayer, Mila Kirstie C Kulsa, Tania Sultana, Amandeep Kaur, Ran Yang, Isidora Ljuri, Benedicto Parker, Anzalee Khan
BACKGROUND: Transcranial direct-current stimulation (tDCS), a non-invasive neurostimulation treatment, has been reported in a number of sham-controlled studies to show significant improvements in treatment-resistant auditory hallucinations in schizophrenia patients, primarily in ambulatory and higher-functioning patients, but little is known of the effects of tDCS on hospitalized, low-functioning inpatients. OBJECTIVE/HYPOTHESIS: The purpose of this study was to examine the efficacy and safety of tDCS for auditory hallucinations in hospitalized ultra-treatment-resistant schizophrenia (TRS) and to evaluate the effects of tDCS on cognitive functions...
October 2, 2018: Brain Stimulation
T Schwippel, I Papazova, W Strube, A J Fallgatter, A Hasan, C Plewnia
Schizophrenia is a severe and often detrimental psychiatric disorder. The individual patients' level of functioning is essentially determined by cognitive, particularly working memory (WM), deficits that are critically linked to dysfunctional activity of the dorsolateral prefrontal cortex (dlPFC). Transcranial direct current stimulation (tDCS) can transiently modulate activity of the dlPFC and remote areas and has been shown to improve WM functions. It may therefore provide a new, targeted treatment option...
October 3, 2018: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
S Castaño-Castaño, G Martinez-Navarrete, M Morales-Navas, E Fernadez-Jover, F Sanchez-Santed, F Nieto-Escámez
In this work visual functional improvement of amblyopic Long Evans rats treated with tDCS has been assessed using the "slow angled-descent forepaw grasping" (SLAG) test. This test is based on an innate response that does not requires any memory-learning component and has been used before for measuring visual function in rodents. The results obtained show that this procedure is useful to assess monocular but not binocular deficits, as controls and amblyopic animals showed significant differences during monocular but not during binocular assessment...
October 1, 2018: Brain Research
A K Martin, J Huang, A Hunold, M Meinzer
Theories of right temporoparietal junction (rTPJ) function in social cognition include self-other distinction, self-inhibition, or embodied rotation, whereas the dorsomedial prefrontal cortex (dmPFC) is associated with integrating social information. However, no study has provided causal evidence for dissociable roles of the rTPJ and dmPFC in social cognition. A total of 52 healthy young adults were stratified to receive either dmPFC or rTPJ anodal high-definition transcranial direct current stimulation (HD-tDCS) in a sham-controlled, double-blinded, repeated measures design...
October 1, 2018: Cerebral Cortex
Masamitsu Naka, Daisuke Matsuzawa, Daisuke Ishii, Hiroyuki Hamada, Tomoko Uchida, Katsuo Sugita, Chihiro Sutoh, Eiji Shimizu
Transcranial direct current stimulation (tDCS) is a non-invasive brain stimulation technique that modulates cortical excitability in a polarity-dependent manner. The diffuse nature of tDCS makes it difficult to investigate the optimal stimulation parameters for more effective and specific cognitive enhancement; to address this deficit, a more focalized stimulation technique, high-definition tDCS (HD-tDCS), has been developed. To date, only a few studies have examined the effects of HD-tDCS on cognitive functions; and none has investigated the effects of HD-tDCS on different sensory modalities of verbal working memory...
September 26, 2018: Neuroscience Letters
Ann Van de Winckel, James R Carey, Teresa A Bisson, Elsa C Hauschildt, Christopher D Streib, William K Durfee
BACKGROUND: Transcranial direct current stimulation (tDCS) is an effective neuromodulation adjunct to repetitive motor training in promoting motor recovery post-stroke. Finger tracking training is motor training whereby people with stroke use the impaired index finger to trace waveform-shaped lines on a monitor. Our aims were to assess the feasibility and safety of a telerehabilitation program consisting of tDCS and finger tracking training through questionnaires on ease of use, adverse symptoms, and quantitative assessments of motor function and cognition...
September 18, 2018: Journal of Neuroengineering and Rehabilitation
Sheida Rabipour, Allan D Wu, Patrick S R Davidson, Marco Iacoboni
Growing interest surrounds transcranial direct current stimulation (tDCS) as a safe and inexpensive method for improving cognitive functions and mood. Nevertheless, tDCS studies rarely examine psychological factors such as expectations of outcomes, which may influence tDCS responsiveness through placebo-like effects. Here we sought to evaluate the potential influence of expectations on tDCS intervention outcomes. We assessed expectations of tDCS outcomes in 88 healthy young adults on three occasions: i) at baseline; ii) after reading information implying either high or low effectiveness of stimulation; and iii) after a single-session of sham-controlled anodal tDCS applied to the left dorsolateral prefrontal cortex, during working memory (WM) training...
October 2018: Neuropsychologia
Jessica Grundey, Jerick Barlay, Giorgi Batsikadze, Min-Fang Kuo, Walter Paulus, Michael Nitsche
KEY POINTS: Nicotine (NIC) modulates cognition and memory function by targeting the nicotinic ACh receptor and releasing different transmitter systems postsynaptically. With both NIC-generated mechanisms, calcium influx and calcium permeability can be regulated, which is a key requirement for the induction of long-term potentiation, comprising the physiological basis of learning and memory function. We attempt to unmask the underlying mechanism of nicotinic effects on anodal transcranial direct current stimulation (tDCS)-induced long-term potentiation-like plasticity based on the hypothesis of calcium-dependency...
November 2018: Journal of Physiology
Vinicius Souza Dos Souza Dos Santos, Maxciel Zortea, Rael Lopes Alves, Cátia Cilene Dos Santos Naziazeno, Júlia Schirmer Saldanha, Sandra da Conceição Ribeiro de Carvalho, António Jorge da Costa Leite, Iraci Lucena da Silva Torres, Andressa de Souza, Prisla Ücker Calvetti, Felipe Fregni, Wolnei Caumo
Cognitive dysfunction in fibromyalgia has been reported, especially memory. Anodal transcranial direct current stimulation (tDCS) over the dorsolateral prefrontal cortex (DLPFC) has been effective in enhancing this function. We tested the effects of eight sessions of tDCS and cognitive training on immediate and delayed memory, verbal fluency and working memory and its association with brain-derived neurotrophic factor (BDNF) levels. Forty females with fibromyalgia were randomized to receive eight sessions of active or sham tDCS...
August 20, 2018: Scientific Reports
Eda Mizrak, Kamin Kim, Brooke Roberts, Daniel John Ragland, Cameron Carter, Charan Ranganath
Research on transcranial direct current stimulation (tDCS) has grown rapidly, but there is controversy regarding whether and how tDCS could impact memory performance. We report a study that addressed this question by examining the effects of oscillatory tDCS (otDCS) on subsequent episodic memory performance and concomitant recordings of neural oscillations. Neural oscillations in the theta band (4-7 Hz) have been shown to be important for episodic memory and especially for source memory retrieval. Here, we tested the effects of anodal otDCS at theta (5...
September 5, 2018: Cognitive Neuroscience
Jun Yeon Won, Jae Sung Lee
We propose a new highly integrated FPGA-only signal digitization method for individual signal digitization of time-of-flight positron emission tomography (TOF PET). We configured I/O port of the FPGA with a single-ended memory interface (SeMI) input receiver. The SeMI is a single-ended voltage-referenced interface that has a common reference voltage per I/O Bank, such that each SeMI input receiver can serve as a voltage comparator. The FPGA-only digitizer that uses the single-ended input receivers does not require a separate digitizing integrated chip, and can obtain twice as many signals as that using LVDS input receivers...
August 15, 2018: IEEE Transactions on Biomedical Circuits and Systems
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