Visual evoked potentials modulation during direct current cortical polarization

Accornero, N.; Voti, P. Li; Riccia, Maurizio La; Gregori, B.

doi:10.1007/s00221-006-0733-y

Cited by 173 publications

(150 citation statements)

References 21 publications

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“…Therefore, the cathodal stimulation was completely ineffective from a behavioral perspective. The absence of a cathodal effect has also been reported in previous studies (Antal et al, 2004d;Fertonani et al, 2010;Kraft et al, 2010), although several papers have reported either inhibitory (Antal et al, 2001(Antal et al, , 2003a(Antal et al, ,b, 2004a or facilitatory (Antal et al, 2004c;Accornero et al, 2007) effects. This discrepancy is probably due to several factors, such as the different experimental tasks (e.g., patternreversal checkerboard vs sinusoidal luminance gratings) and the differences in stimulation parameters (e.g., intensity, duration, electrode size, and the location and direction of the current flow) (Nitsche et al, 2008).…”

Section: Discussionsupporting

confidence: 60%

Random Noise Stimulation Improves Neuroplasticity in Perceptual Learning

Fertonani¹,

Pirulli²,

Miniussi³

2011

J. Neurosci.

311

329

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Perceptual learning is considered a manifestation of neural plasticity in the human brain. We investigated brain plasticity mechanisms in a learning task using noninvasive transcranial electrical stimulation (tES). We hypothesized that different types of tES would have varying actions on the nervous system, which would result in different efficacies of neural plasticity modulation. Thus, the principal goal of the present study was to verify the possibility of inducing differential plasticity effects using two tES approaches [i.e., direct current stimulation (tDCS) and random noise stimulation (tRNS)] during the execution of a visual perceptual learning task.One hundred seven healthy volunteers participated in the experiment. High-frequency tRNS (hf-tRNS, 100 -640 Hz), low-frequency tRNS (lf-tRNS, 0.1-100 Hz), anodal-tDCS (a-tDCS), cathodal-tDCS (c-tDCS), and sham stimulation were applied to the visual areas of the brain in a group of volunteers while they performed an orientation discrimination task. Furthermore, a control group was stimulated on the vertex (Cz). The analysis showed a learning effect during task execution that was differentially modulated according to the stimulation conditions. Post hoc comparisons revealed that hf-tRNS significantly improved performance accuracy compared with a-tDCS, c-tDCS, sham, and Cz stimulations.Our results confirmed the efficacy of hf-tRNS over the visual cortex in improving behavioral performance and showed its superiority in comparison to others tES. We concluded that the mechanism of action of tRNS was based on repeated subthreshold stimulations, which may prevent homeostasis of the system and potentiate task-related neural activity. This result highlights the potential of tRNS and advances our knowledge on neuroplasticity induction approaches.

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Section: Discussionsupporting

confidence: 60%

Random Noise Stimulation Improves Neuroplasticity in Perceptual Learning

Fertonani¹,

Pirulli²,

Miniussi³

2011

J. Neurosci.

311

329

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“…Such response characteristics respectively follow the known contrast response functions of the parvocellular and magnocellular pathways to sinusoidal luminance gratings (Benardete et al 1992;Benardete and Kaplan 1997a,b;Derrington and Lennie 1984;Merigan and Eskin 1986;Merigan and Maunsell 1993;Tootell et al 1988). Additionally, both C1 and P1 components have been shown to be pharmacologically separable in the cat visual cortex (e.g., Arakawa et al 1993;Zemon et al 1980) and are differentially modulated by cathodal or anodal stimulation in transcranial direct current stimulation (tDCS) paradigms with human participants (Accornero et al 2007;Antal et al 2004). The pharmacological separability of the C1 and P1 VEP components in cats and differential modulation of the same components in humans using tDCS would both be expected if each component were generated by different neural populations.…”

mentioning

confidence: 57%

Different spatial frequency bands selectively signal for natural image statistics in the early visual system

Hansen

Johnson

Ellemberg

2012

Journal of Neurophysiology

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Hansen BC, Johnson AP, Ellemberg D. Different spatial frequency bands selectively signal for natural image statistics in the early visual system. J Neurophysiol 108: 2160 -2172, 2012. First published July 25, 2012 doi:10.1152/jn.00288.2012.-Early visual evoked potentials (VEPs) measured in humans have recently been observed to be modulated by the image statistics of natural scene imagery. Specifically, the early VEP is dominated by a strong positivity when participants view minimally complex natural scene imagery, with the magnitude of that component being modulated by luminance contrast differences across spatial frequency (i.e., the slope of the amplitude spectrum). For scenes high in structural complexity, the early VEP is dominated by a prominent negativity that exhibits little dependency on luminance contrast. However, since natural scene imagery is broad band in terms of spatial frequency, it is not known whether the above-mentioned modulation results from a complex interaction within or between the early neural processes tuned to different bands of spatial frequency. Here, we sought to address this question by measuring early VEPs (specifically, the C1, P1, and N1 components) while human participants viewed natural scene imagery that was filtered to contain specific bands of spatial frequency information. The results show that the C1 component is largely unmodulated by the luminance statistics of natural scene imagery (being only measurable when such stimuli were made to contain high spatial frequencies). The P1 and N1, on the other hand, were observed to exhibit strong spatial frequency-dependent modulation to the luminance statistics of natural scene imagery. The results therefore suggest that the dependency of early VEPs on natural image statistics results from an interaction between the early neural processes tuned to different bands of spatial frequency.

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“…Several studies showed that tDCS might modulate cortical excitability in the human motor cortex (Boggio, Castro, et al, 2006;Boggio et al, 2007;Boros, Poreisz, Münchau, Paulus, & Nitsche, 2008), visual cortex (Accornero, Li Voti, La Riccia, & Gregori, 2007;Antal et al, 2004), and parietal cortex (Sparing et al, 2009;Stone & Tesche, 2009) and also could have clinical implications (Brunoni et al, 2012). In addition to motor and visual learning tasks, tDCS has been effectively used in memory studies, especially working memory (Boggio, Ferrucci, et al, 2006;Fregni et al, 2005;Jo et al, 2009), episodic memory, and declarative memory (Javadi & Walsh, 2012;Marshall, Mölle, Hallschmid, & Born, 2004).…”

Section: Introductionmentioning

confidence: 99%

Transcranial Direct Current Stimulation of Dorsolateral Prefrontal Cortex of Major Depression: Improving Visual Working Memory, Reducing Depressive Symptoms

Salehinejad

Rostami²,

Ghanavati³

2015

NeuroRegulation

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Recent studies on major depression (MD) have used noninvasive brain stimulation techniques such as transcranial direct current stimulation (tDCS) to improve impaired emotion and cognition in MD. However, such experiments have yielded mixed results, specifically with respect to cognition in MD. This study aimed to investigate whether anodal and cathodal tDCS applied over the dorsolateral prefrontal cortex (DLPFC) would significantly improve visual working memory and reduce depressive symptoms in patients with MD. Thirty patients with major depression (n = 30) were randomly assigned to receive either experimental (active) or control (sham) tDCS. To measure cognitive functions, the participants underwent a series of visual memory neuropsychological tasks; and to measure depression symptoms, the Beck Depression Inventory (BDI) and Hamilton Depression Scale (HDRS) were used. The parameters of active tDCS included 2 mA for 20 min per day for 10 consecutive days, anode over the left DLPFC (F3), cathode over the right DLPFC (F4) region. After 10 sessions of anodal and cathodal tDCS, patients showed significantly improved performance in visual working memory tasks. The same results were observed for depression symptoms. This study showed that anodal tDCS over left DLPFC, concurrently with cathodal tDCS over right DLPFC, improved cognitive impairment (specifically visual working memory), as well as reduced depressive symptoms in patients with MD. This finding provides evidence that supports effectiveness of a specific montage of tDCS to improve impaired cognition in MD, specifically in visual working memory.

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Visual evoked potentials modulation during direct current cortical polarization

Cited by 173 publications

References 21 publications

Random Noise Stimulation Improves Neuroplasticity in Perceptual Learning

Random Noise Stimulation Improves Neuroplasticity in Perceptual Learning

Different spatial frequency bands selectively signal for natural image statistics in the early visual system

Transcranial Direct Current Stimulation of Dorsolateral Prefrontal Cortex of Major Depression: Improving Visual Working Memory, Reducing Depressive Symptoms

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