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Stress and Emotion Open Access Data: A Review on Datasets, Modalities, Methods, Challenges, and Future Research Perspectives
(Springer Nature, 2025-06-18) Ometov, Aleksandr; Mezina, Anzhelika; Lin, Hsiao-Chun; Arponen, Otso; Burget, Radim; Nurmi, Jari
Remote continuous patient monitoring is an essential feature of eHealth systems, offering opportunities for personalized care. Among its emerging applications, emotion and stress recognition hold significant promise, but face major challenges due to the subjective nature of emotions and the complexity of collecting and interpreting related data. This paper presents a review of open access multimodal datasets used in emotion and stress detection. It focuses on dataset characteristics, acquisition methods, and classification challenges, with attention to physiological signals captured by wearable devices, as well as advanced processing methods of these data. The findings show notable advances in data collection and algorithm development, but limitations remain, e.g., variability in real-world conditions, individual differences in emotional responses, and difficulties in objectively validating emotional states. The inclusion of self-reported and contextual data can enhance model performance, yet lacks consistency and reliability. Further barriers include privacy concerns, annotation of long-term data, and ensuring robustness in uncontrolled environments. By analyzing the current landscape and highlighting key gaps, this study contributes a foundation for future work in emotion recognition. Progress in the field will require privacy-preserving data strategies and interdisciplinary collaboration to develop reliable, scalable systems. These advances can enable broader adoption of emotion-aware technologies in eHealth and beyond.
Fractional-Order Equivalent Circuit Representation of Sucrose Solutions Electrical Impedance Measured in Bipolar Configuration
(IEEE, 2025-03-30) Duckworth, Colin; Šotner, Roman; Jeřábek, Jan; Freeborn, Todd
In this work, the alteration in electrical impedance of a liquid (unsweetened FuzeTea) with varying increases in sucrose concentrations (up to 785 mM) was investigated. The aim was to further understand how changes in liquid solutions with adulterants (in this case sucrose) change the electrical impedance as a potential method for food quality monitoring. The electrical impedance was measured from 100 Hz to 1 MHz using gold and platinum electrodes, then numerical optimization was applied to collected datasets to estimate the model parameters of a fractional-order equivalent circuit model to best represent the data. This model demonstrated less than 2% impedance magnitude and less than 6% impedance phase deviation compared to the experimental data. Overall, the model parameter representing the liquid resistance showed large increases for increasing concentrations of sucrose, suggesting that it may be a potential marker for assessing sucrose adulterants in liquid solutions.
Differentiator circuits with scalable and electronically adjustable time constant and their application in phase shift evaluation
(Elsevier, 2025-05-03) Šotner, Roman; Polák, Ladislav; Petržela, Jiří; Semenov, Dmitrii; Langhammer, Lukáš; Jaikla, Winai
Two novel scalable and electronically adjustable differentiator designs are presented in this paper. These designs are based on special variable gain amplifiers extending well-known concept of standard single operational amplifier-based differentiators. The key novelty lies in their scalability, which allows for an enhanced time constant value by adjusting the ratio of resistors. Simultaneously, the special form of gain control using a DC voltage offers wide electronic tunability. The solution performs high input and low output impedance, both independent of frequency. Experimental testing demonstrated time constant adjustments in two configurations: from 64 ns to 4.5 mu s (a ratio of maximal and minimal value 70) and from 8.7 mu s to 183 mu s (a ratio of 21). As an application example, the proposed differentiator is utilized in the design of a readout system for an absolute phase shift difference to pulse width ratio converter, suitable for monitoring a very slow phenomenon such biosignals.
Toward a Tailored Acoustic-Based Approach in Music Neuromodulation in Epilepsy
(Wiley, 2025-07-05) Strýček, Ondřej; Mekyska, Jiří; Miklánek, Štěpán; Fusek, Michal; Štillová, Klára; Mazánek, Martin; Rektor, Ivan
Background Music-based neuromodulation has garnered interest as a potential therapeutic approach for drug-resistant epilepsy. This study expands on prior research by examining the effects of different musical features on interictal epileptiform discharges (IEDs) within intracerebral EEG (iEEG). Methods Twenty-five patients with drug-resistant epilepsy undergoing presurgical iEEG evaluation participated in the study. Over 2days, patients listened to various musical compositions characterized by distinct acoustic properties. EEG measurements were recorded before and after each listening session to evaluate IED changes. Results The study identified individualized patterns in IED reduction, with certain acoustic properties showing consistent effects across musical genres. Mozart's “Piano Concerto No. 27” K 595c globally reduced IEDs by 28% while listening to music (p=0.0191) and 19% in the postmusic resting state (p=0.0111); relaxation music increased IEDs by 55% (p=0.0197). Based on the acoustic analysis of individuals, we identified compositions that significantly reduced IEDs, with reductions ranging from 32% to 44% (p=0.0001). In contrast, compositions with differing acoustic properties did not result in significant changes in IEDs. These results suggest that specific acoustic properties, rather than genre, primarily influence IEDs. Conclusions The findings suggest that specific acoustic properties can influence brain activity in a reproducible manner at the individual level, modulating IEDs based on personalized testing and selection across a spectrum of musical genres. These results suggest the potential for music-based neuromodulation as a personalized therapeutic approach in epilepsy management, emphasizing the importance of acoustic features over musical genre. Further research is needed to explore individual aspects of music-based interventions.
Paměť zvuku (Smetana–Dvořák–Janáček). K metodě zpracování zvukových nahrávek pomocí nástroje MemoVision
(CZECH ACAD SCIENCES PRESS, 2024-01-18) Spurný, Lubomír; Ištvánek, Matěj; Jiraský, Jan
Tato studie představuje výsledky projektu „Paměť zvuku: evoluční principy interpretační tradice české hudby na příkladu děl Antonína Dvořáka a Bedřicha Smetany“ (TAČR). Cílem projektu je vytvořit analytické nástroje pro analýzu hudebně-interpretačního výkonu. Projekt zkoumá využití výpočetních metod, strojového učení a umělé inteligence k zachycení interpretačního vývoje klavírních děl Bedřicha Smetany a Antonína Dvořáka. V rámci projektu jsme připravili open-source software „MemoVision“. Tento nástroj kombinuje uživatelsky přívětivé rozhraní a moderní metody zpracování dat. Zaměřuje se na využití metod oboru získávání hudebních informací pro účely analýzy hudebně-interpretačního výkonu. Hlavní důraz je kladen na srovnávací analýzu – výpočet a rozbor rozdílů mezi vícero verzemi stejného hudebního díla. Uživatelé mohou nahrávat zvukové nahrávky, metadata a anotace pozic taktů v podobě „základní pravdy“ a označit každou nahrávku tzv. binárním štítkem. Poté software extrahuje informace ze všech nahrávek a uživateli poskytne užitečné podněty pro kvalitativní výzkum. Uživatelé mohou přehrávat konkrétní rozsahy taktů, vytvářet vlastní sekce podle hudebního významu nebo vizualizovat data o interpretačním výkonu a rozdíly mezi nahrávkami nebo skupinami nahrávek. Nástroj MemoVision kombinuje metodu synchronizace a statistického vyhodnocení spolu s možnostmi vizua- lizace, aby přispěl k porozumění dat o interpretačním výkonu. Možnosti softwaru jsou prezentovány také na několika interpretacích Smyčcového kvartetu č. 13 G dur, op. 106 Antonína Dvořáka a Smyčcového kvartetu č. 2 „Listy důvěrné“ Leoše Janáčka v sekci „Smyčcové kvartety: Dvořák–Janáček“. Následující sekce „Exkurs: České tance Bedřicha Smetany“ využívá rozsáhlou hudební databázi Smetanových českých tanců. Zastoupení nahrávek zahraničních klavíristů je sice nižší, ale tvoří dostatečně reprezentativní skupinu umožňující zachytit rozdíly mezi jednou z binárních tříd (v našem případě jsme zvolili české vs. zahraniční interprety). Cílem analýzy bylo najít takty nebo úseky, ve kterých se interpretace dvou definovaných skupin nejvíce lišily.

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