Processing of mathematical operations and solving numerical tasks implicate a distributed set of brain regions. These regions include the superior and inferior parietal lobules that underlie numerical processing such as size judgments, and additional prefrontal regions that are needed for formal mathematical operations such as addition, subtraction and multiplication [Arsalidou, Taylor, 2011]. Critically, little is known about the connectivity between these regions and the association between math performance and the anatomical structure of white matter tracts. The present study investigates connectivity and white matter tracks associated with networks related to math performance: arcuate fasciculus (AF) and superior longitudinal fasciculus (SLF). Participants performed a computerized task with mathematical operations (addition, subtraction, multiplication, and division) with three levels of difficulty; accuracy and reaction time were recorded. Diffusion tensor imagining (DTI) recordings provided indices on fractional anisotropy (FA) — a measure of the direction of white matter tracks in the brain. The relation between FA and math performance scores is reported.
This paper is an empirical study of the changing nature of the dependence of fundamental factors on the stock market index, which is the trend identified earlier in the Russian stock market. We empirically test the impact of daily values of fundamental factors on the MOEX Russia Index from 2003 to 2018. The analysis of the ARIMA-GARCH (1,1) model with a rolling window reveals that the change in the power and direction of the influence of the fundamental factors on the Russian stock market persists. The Quandt-Andrews breakpoint test and Bai-Perron test identify the number and likely location of structural breaks. We find multiple breaks probably associated with the dramatic falls of the stock market index. The results of the regression models over the different regimes, defined by the structural breaks, can vary markedly over time. This research is of value in macroeconomic forecasting and in the investment strategy development
In this paper, we analyze a new approach for demand prediction in retail. One of the signicant gaps in demand prediction by machine learning methods is the unaccounted sales data censorship. Econometric approaches to modeling censored demand are used to obtain consistent and unbiased estimates of parameters. These approaches can also be transferred to different classes of machine learning models to reduce the prediction error of sales volume. In this study we build two ensemble models to predict demand with and without demand censorship, aggregating predictions for machine learning methods such as Linear regression, Ridge regression, LASSO and Random forest. Having estimated the predictive properties of both models, we test the best predictive power of the models with accounting for the censored nature of demand.
The texts I have revised testify the line developed from the more “naïve” and ontologizing discourse of Ps.-Macarius to the discourse where the unity is spoken of as a phenomenon revealed for intellectual abilities, which suggests an indication of unity in a certain respect and preserves from interpreting this unity as a merge of unified natures. For the latter we can distinguish the strategy of cognition / recognition, which Maximus the Confessor and Symeon the New Theologian adhered to. According to this strategy, by the properties displayed by incandescent iron, we can discern the nature of fire revealed in iron, and, in the same way, we can conclude that human is god (of small letter) on the basis of that he manifests himself as God, that is, exposes the divine features.
I show that Gregory of Nyssa used significant points from a passage of Porphyry’s Isagoge while developing his doctrine of the general and the particular.
Proceedings of the Fifth Workshop on Experimental Economics and Machine Learning at the National Research Univeristy Higher School of Economics co-located with the Seventh International Conference on Applied Research in Economics (iCare7)
The article analyzes some key moments in the history of temporal logics in late antiquity (conception of integral time, relationship between temporal and eternal, extended and instant in the systems of Iamblichus, Proclus, Damascius and Simplicius), and genesis of Christian forms of temporal logics, which transform the everlasting homogenous time of κόσμος into history of universal salvation, alterate unextended νῦν, moment of psycho-physical time of late Neoplatonists, with καιρός, eschatologically charged instant of decision and act that can interrupt the continuity of time and to achieve instantaneously the end, τέλος of history.
Today, treatment effect estimation at the individual level is a vital problem in many areas of science and business. For example, in marketing, estimates of the treatment effect are used to select the most efficient promo-mechanics; in medicine, individual treatment effects are used to determine the optimal dose of medication for each patient and so on. At the same time, the question on choosing the best method, i.e., the method that ensures the smallest predictive error (for instance, RMSE) or the highest total (average) value of the effect, remains open. Accordingly, in this paper we compare the effectiveness of machine learning methods for estimation of individual treatment effects. The comparison is performed on the Criteo Uplift Modeling Dataset. In this paper we show that the combination of the Logistic Regression method and the Difference Score method as well as Uplift Random Forest method provide the best correctness of Individual Treatment Effect prediction on the top 30% observations of the test dataset.
In this article I seek to show in what manner the Stoic principle of total blending, illustrated by the example of the penetration of fire into iron, finds its refraction in Byzantine Christological teachings. According to the Stoics, total blending occurs when one body accepts certain qualities of the other, while remaining itself, or when both mixed bodies acquire qualities of each other while preserving their natures. I argue that Origen’s use of the example of incandescent iron had an effect on the later theological discourse. There it appears in two contexts, Christology and deification. In this article the focus is on Christology. I claim that the example was introduced into the Christological discourse by Apollinarius of Laodicea. Then, I investigate how it was transformed in later theological writings by (Ps.-) Basil of Caesarea, Theodoret of Cyrus, Cyril of Alexandria, Sever of Antioch, John of Damascus, and the Corpus Leontianum. In this context, I pay special attention to the discrepancy between John of Damascus and Leontius of Jerusalem as regards the issue of the complexity of Christ’s hypostasis. I clarify the causes of this discrepancy.
Trial-to-trial variability of the motor evoked potentials (MEP) to transcranial magnetic stimulation (TMS) is a well-known phenomenon. However, the relationship between the fluctuations of the different types of the motor output and other motor system parameters such as corticospinal excitability, interhemispheric inhibition (IHI) and their interhemispheric asymmetry have not yet been fully investigated. We studied 20 young healthy right-handed volunteers. Four TMS sessions were performed (two single-pulse TMS and two paired-coil TMS with IHI paradigm sessions for each hemisphere), 70 stimuli were delivered during every session. Coefficient of quartile variation (CQV) was used to quantify trail-to-trail variability of MEPs amplitude. Resting motor threshold values were correlated between hemispheres (r = .842, p < .001). IHI phenomenon from the left hemisphere was obtained in 18 out of 20 volunteers, while IHI phenomena from the right hemisphere was shown in 16 out of 20. A strong correlation between the variability of MEP‘s amplitudes during IHI paradigm and the degree of IHI was found for the left hand (r = −.718, p < .001). We also observed a strong correlation between CQV of MEPs from both hands to single-pulse TMS (r = .632, p = .004). A side-specific correlation between the variability of the responses to single-pulse and paired-coil TMS was found for the dominant hemisphere (r = .524, p = .021). Our preliminary results demonstrate the importance of the trial-to-trial variability of the MEPs and its interhemispheric specificity as a defining characteristics of the motor system. This study was partially supported by ofi-m RFBR grant 17-29-02518, by HSE Basic Research Program and Russian Academic Excellence Project ‘5-100’.
The author shows how the Stoic principle of total blending of physical bodies finds its refraction in the Byzantine Christological teachings on the example of penetration of fire into iron. According to the Stoics, total blending occurs when one body accepts certain qualities of the other, however, remaining themselves, or both mixed bodies acquire qualities of each other preserving their natures. Analysis. The author asserts that Origen’s use of the example of iron incandesced by fire turned out to be paradigmatic for the subsequent Christian literature, and influenced the formation of two directions of using this example at once: in Christological context, as well as to describe deification of man. Further, the author addresses to Christological problematics and claims that using the incandesced iron example in Byzantium literature in properly Christological context began with Apollinarius of Laodicea. The paper also investigates the specificity of the refraction of this example in Christological perspective in (Ps.-) Basil of Caesarea, Theodoret of Cyrus, Cyril of Alexandria, Severus of Antioch, John of Damascus, and Corpus Leontianum. Results. In this context, the author pays special attention to the discrepancy between John Damascus and Leontius of Jerusalem regarding the issue of the complexity of Christ’s hypostasis. The researcher clarifies prerequisites of this discrepancy.
Gregory of Nyssa in his Against Eunomius cites a fragment of Eunomius’ Apology on Apology, where Eunomius speaks of “greater and lesser” activities, claiming that the works of the Son and the Holy Spirit are inferior to those of the Father, while the works of the Spirit are inferior to those of the Son. However, discussing this quotation, Gregory misinterprets Eunomius’ own words. He reads Eunomius as if he applied the principle of “the more and the less” not to the activities but to the substances of the Father, the Son, and the Spirit. I argue that this is not what Eunomius actually wrote. Appealing to testimonies from the Thesaurus by Cyril of Alexandria, I show that the two opponents (Gregory of Nyssa and Eunomius) used the same Aristotelian position, which prohibits the application of the principle of “the more and the less” to the category of substance, in order to argue against each other.