159 research outputs found
Modality-specific and modality-general electrophysiological correlates of visual and auditory awareness : Evidence from a bimodal ERP experiment
No full textTo date, most studies on the event-related potential (ERP) correlates of conscious perception have examined a single perceptual modality. We compared electrophysiological correlates of visual and auditory awareness in the same experiment to test whether there are modality-specific and modality-general correlates of conscious perception. We used near threshold stimulation and analyzed event-related potentials in response to aware and unaware trials in visual, auditory and bimodal conditions. The results showed modality-specific negative amplitude correlates of conscious perception between 200 and 300 ms after stimulus onset. A combination of these auditory and visual awareness negativities was observed in the bimodal condition. A later positive amplitude difference, whose early part was modality-specific, possibly reflecting access to global workspace, and later part shared modality-general features, possibly indicating higher level cognitive processing involving the decision making, was also observed.CC BY 4.0© 2022 The AuthorsCorresponding author: Department of Psychology, University of Turku, 20014, Turku, Finland. E-mail address: [email protected] (D. Filimonov).This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.</p
Event-related potential correlates of consciousness in simple auditory hallucinations
No full textNeural correlates of consciousness (NCC) have been proposed for perceptual awareness in various sensory modalities. To date, perceptual awareness negativity (PAN) and late positivity (LP) are considered the main NCC candidates, and the question remains which one is the NCC proper. Investigating states where the content of consciousness is independent of the physical stimulus, may provide additional theoretical and empirical value. We studied the event-related potential (ERP) markers of auditory awareness in simple auditory hallucinations using a Pavlovian conditioning paradigm, where participants listened to the near-threshold tones and stimulus-absent trials, rating subjective clarity with the perceptual awareness scale (PAS). The results showed auditory awareness negativity (AAN) — an early event-related potential difference between aware and unaware stimuli — in the hallucinatory condition, suggesting that AAN is an NCC proper in auditory consciousness. Late positivity was absent in simple auditory hallucinations.CC BY 4.0© 2025 The Author(s)Correspondence Address: D. Filimonov; Department of Psychology, University of Turku, Finland; email: [email protected]; CODEN: NEIMEThis research has received a grant from Signe and Ane Gyllenbergs Foundation.</p
CONTINUAL MODELS OF DIFFERENCE-DIFFERENTIAL EQUATIONS
No full textThe effect of the splashes in the classical problem about vibrations of the thread with beads has been discoverd. The classes of the equations with partial products approximating the difference-differential equations (DDE) have been described, the periodical solutions of the non-linear DDE have been described, the correctness in the new class of problems for the quasi-linear hyperbolic systems has been proved. The obtained results find application in the theory of difference-differential equations and equations with partial products.Available from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio
Is auditory awareness graded or dichotomous : Electrophysiological correlates of consciousness at different depths of stimulus processing
No full textThe level-of-processing (LoP) hypothesis postulates that transition from unaware to aware visualstimuli is either graded or dichotomous depending on the depth of stimulus processing. Humanscan be progressively aware of the low-level features, such as colors or shapes, while the high-levelfeatures, such as semantic category, enter consciousness in an all-or none fashion. Unlike invision, sounds always unfold in time, which might require mechanisms dissimilar from visualprocessing. We tested the LoP hypothesis in hearing for the first time by presenting participantswith words of different categories, spoken in different pitches near the perceptual threshold. Wealso assessed whether different electrophysiological correlates of consciousness, the auditoryawareness negativity (AAN) and late positivity (LP), were associated with LoP. Our findingsindicate that LoP also applies to the auditory modality. AAN is an early correlate of awarenessindependent of LoP, while LP was modulated by awareness, performance accuracy and the levelof processing.CC BY 4.0Corresponding author at: Department of Psychology, University of Turku, 20014 Turku, Finland. E-mail address: [email protected] (D. Filimonov).This research has received a grant from Signe and Ane Gyllenbergs Foundation.</p
Application of admissible functions in studying partial stability of solutions of a nonlinear system of differential equations
No full textA new approach related to construction of admissible functions that do not coincide with the Lyapunov functions was proposed to investigate partial stability of solutions of systems of ordinary differential equations. An example of using admissible functions for establishing partial stability of solutions for one nonlinear system of differential equations is presented. © 2018 Author(s).The work was supported by Russian Foundation for Basic Research 16–01–00401 and program of scientific research UrB RAS 18–1–1–8
Unjust Enrichment in Leasing Relations
No full textThe practical implications of redemption leasing contract termination are considered in the article. The author comes to the well-founded conclusion that the contract has a complex composition and includes both leasing contract terms and sale and purchase contract terms. The examples of judicial practice proved the occurrence of unjust enrichment on the party of a lessor under certain conditions, as well as some proposals for the existing legislation improvement are advanced
Investigation of gobal stability of the equilibrium position of a system of differential autonomous equations with the help of admissible functions
No full textTo study the global stability of the zero solution, which is a single rest point for a nonlinear system of autonomous differential equations, admissible functions are used. These functions are analogous to Lyapunov functions, but do not coincide with them. Admissible functions can also be used for study the global stability of the zero solution of such systems with respect to part of the variables. An example of the application of such functions to the study of the global stability of the equilibrium state for a second-order nonlinear system is presented. © 2019 Author(s)
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