Valeriia Beliaeva


Last Name

Beliaeva

First Name

Valeriia

ORCID

0000-0002-3515-7265

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2023 - 20246
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Publications1 - 6 of 6
  • The prediction of market-level food choices by the neural valuation signal
    Item type: Journal Article
    Kislov, Andrew; Shestakova, Anna; Ushakov, Vadim; et al. (2023)
    PLoS ONE
    Neuroimaging studies have demonstrated the ability to use the brain activity of a group of individuals to forecast the behavior of an independent group. In the current study, we attempted to forecast aggregate choices in a popular restaurant chain. During our functional magnetic resonance imaging (fMRI) study, 22 participants were exposed to 78 photos of dishes from a new menu of a popular restaurant chain. In addition to self-reported preferences, fMRI data was extracted from an a priori domain-general and task-specific region of interest-the ventral striatum. We investigated the relationship between the neural activity and real one-year sales provided by the restaurant chain. Activity in the ventral striatum, which was defined using the task-specific region of interest, significantly correlated (r = 0.28, p = 0.01) with one-year sales. A regression analysis, which included ventral striatum activity together with the objective characteristics of the products (price and weight), behavioral, and survey data, showed R2 values of 0.33. Overall, our results confirm prior studies, which have suggested, that brain activity in the reward system of a relatively small number of individuals can forecast the aggregate choice of a larger independent group of people.
  • Modulation of Visual Contrast Sensitivity with tRNS across the Visual System, Evidence from Stimulation and Simulation
    Item type: Journal Article
    Potok, Weronika; Post, Alain; Beliaeva, Valeriia; et al. (2023)
    eNeuro
    Transcranial random noise stimulation (tRNS) has been shown to significantly improve visual perception. Previous studies demonstrated that tRNS delivered over cortical areas acutely enhances visual contrast detection of weak stimuli. However, it is currently unknown whether tRNS-induced signal enhancement could be achieved within different neural substrates along the retino-cortical pathway. In three experimental sessions, we tested whether tRNS applied to the primary visual cortex (V1) and/or to the retina improves visual contrast detection. We first measured visual contrast detection threshold (VCT; N = 24, 16 females) during tRNS delivery separately over V1 and over the retina, determined the optimal tRNS intensities for each individual (ind-tRNS), and retested the effects of ind-tRNS within the sessions. We further investigated whether we could reproduce the ind-tRNS-induced modulation on a different session (N = 19, 14 females). Finally, we tested whether the si-multaneous application of ind-tRNS to the retina and V1 causes additive effects. Moreover, we present detailed simulations of the induced electric field across the visual system. We found that at the group level tRNS decreases VCT compared with baseline when delivered to the V1. Beneficial effects of ind-tRNS could be re-plicated when retested within the same experimental session but not when retested in a separate session. Applying tRNS to the retina did not cause a systematic reduction of VCT, regardless of whether the individu-ally optimized intensity was considered or not. We also did not observe consistent additive effects of V1 and retina stimulation. Our findings demonstrate significant tRNS-induced modulation of visual contrast processing in V1 but not in the retina.
  • Improving Mood with Non-Invasive Electrical Stimulation
    Item type: Doctoral Thesis
    Beliaeva, Valeriia (2023)
  • Noninvasive theta-burst stimulation of the human striatum enhances striatal activity and motor skill learning
    Item type: Journal Article
    Wessel, Maximilian J.; Beanato, Elena; Popa, Traian; et al. (2023)
    Nature Neuroscience
    The stimulation of deep brain structures has thus far only been possible with invasive methods. Transcranial electrical temporal interference stimulation (tTIS) is a novel, noninvasive technology that might overcome this limitation. The initial proof-of-concept was obtained through modeling, physics experiments and rodent models. Here we show successful noninvasive neuromodulation of the striatum via tTIS in humans using computational modeling, functional magnetic resonance imaging studies and behavioral evaluations. Theta-burst patterned striatal tTIS increased activity in the striatum and associated motor network. Furthermore, striatal tTIS enhanced motor performance, especially in healthy older participants as they have lower natural learning skills than younger subjects. These findings place tTIS as an exciting new method to target deep brain structures in humans noninvasively, thus enhancing our understanding of their functional role. Moreover, our results lay the groundwork for innovative, noninvasive treatment strategies for brain disorders in which deep striatal structures play key pathophysiological roles.
  • Causal phase-dependent control of non-spatial attention in human prefrontal cortex
    Item type: Journal Article
    Brus, Jeroen; Heng, Joseph A.; Beliaeva, Valeriia; et al. (2024)
    Nature Human Behaviour
    Non-spatial attention is a fundamental cognitive mechanism that allows organisms to orient the focus of conscious awareness towards sensory information that is relevant to a behavioural goal while shifting it away from irrelevant stimuli. It has been suggested that attention is regulated by the ongoing phase of slow excitability fluctuations of neural activity in the prefrontal cortex, a hypothesis that has been challenged with no consensus. Here we developed a behavioural and non-invasive stimulation paradigm aiming at modulating slow excitability fluctuations of the inferior frontal junction. Using this approach, we show that non-spatial attention can be selectively modulated as a function of the ongoing phase of exogenously modulated excitability states of this brain structure. These results demonstrate that non-spatial attention relies on ongoing prefrontal excitability states, which are probably regulated by slow oscillatory dynamics, that orchestrate goal-oriented behaviour.
  • Using an active phase cancellation and multipair design for in-vivo focal temporal interference electrical brain stimulation
    Item type: Conference Poster
    Savvateev, Iurii; Missey, Florian; Beliaeva, Valeriia; et al. (2023)
    Temporal Interference Stimulation (TI) (1) represents a novel technique for deep brain stimulation, aiming to integrate the depth characteristic of conventional deep brain stimulation protocols with the non-invasive nature of transcranial electric and magnetic stimulations (tACS and TMS). Recent publications in both mice and humans explicitly demonstrated that deep brain areas including the hippocampus and the striatum could be stimulated using TI (2, 3). However, whereas TI stimulation is set to be focused on a specific region of interest (ROI), other off-target areas may still be stimulated due to the field propagation. This is a major concern when TI is employed at high stimulation amplitudes, as off-target stimulations have a potential to cause unwanted side effects such as epileptic convulsions (2).
Publications1 - 6 of 6