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Arterial blood flow waveform shapes – their original quantification and importance in chosen aspects of physiology and psychology: A review

Gólczewski Tomasz

Biocybernetics and Biomedical Engineering

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2021

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Vol. 41, no. 4

1418--1435

EN

Arterial blood flow waveform shape (ABFWS) analysis is usually employed in vessels diagnosis. This review presents links between ABFWS and some other physiological and psychological aspects. ABFWS for brachial and common carotid arteries is quantified with a Waveform Age (WA) index. WA well correlates with calendar age (CA): r = 0.79 and 0.88 for carotid and brachial arteries, respectively. The mean (expected) WA for a particular CA is equal to it. WA depends on blood flow wave reflections: WA is older for lower reflections (smaller flow pulsatility). An upper death limit of WA seems to exist; hypertension in the elderly may be a defense mechanism protecting against exceeding this limit. Relationships between WA and heart rate, fatigue and cognitive functions are most interesting. Regardless of breathing pattern, respiratory induced changes of heart rate are strongly correlated with WAs that were 1.7 s earlier (r = 0.87). Fatigue is associated with WA increase (p < 0.002); in a way, fatigue accompanies aging or temporary mimics it. WA is significantly lower than CA in persons with high intelligence quotient and significantly higher in patients with intellectual disability of unknown etiology (p < 0.000001). WA relatively well correlates with Matrices Tests scores (r = 0.65 for a linear combination of WAs for all the four arteries; 42 students, 16 yrs, the same social and educational levels). ABFW-Sdependent production of vasoactive substances (including nitric oxide being also a neurotransmitter) by endothelium, might be responsible for those surprising relationships. ABFWS can be treated, though only to some extent, as a kind of Damasio’s somatic markers.

2

Fuzzy-based Description of Computational Complexity of Central Nervous Systems

Prokopowicz Piotr, Mikołajewski Dariusz, Tyburek Krzysztof, Kotlarz Piotr

Journal of Telecommunications and Information Technology

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2020

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nr 3

57--66

EN

Computational intelligence algorithms are currently capable of dealing with simple cognitive processes, but still remain inefficient compared with the human brain’s ability to learn from few exemplars or to analyze problems that have not been deﬁned in an explicit manner. Generalization and decision-making processes typically require an uncertainty model that is applied to the decision options while relying on the probability approach. Thus, models of such cognitive functions usually interact with reinforcement-based learning to simplify complex problems. Decision-makers are needed to choose from the decision options that are available, in order to ensure that the decision-makers’ choices are rational. They maximize the subjective overall utility expected, given by the outcomes in diﬀerent states and weighted with subjective beliefs about the occurrence of those states. Beliefs are captured by probabilities and new information is incorporated using the Bayes’ law. Fuzzy-based models described in this paper propose a diﬀerent – they may serve as a point of departure for a family of novel methods enabling more effective and neurobiologically reliable brain simulation that is based on fuzzy logic techniques and that turns out to be useful in both basic and applied sciences. The approach presented provides a valuable insight into understanding the aforementioned processes, doing that in a descriptive, fuzzy-based manner, without presenting a complex analysis.

3

Leadership styles as a mental representation in the context of personality skills

Kraczla Magdalena

Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska

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2019

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z. 136

277--287

EN

The choice of leadership style demonstrated by people in managerial positions is conditioned by numerous factors and specific organisational situations. However, every manager has an individual inclination to act in a consistent way, which in science is referred to with the term leadership style. These personal tendencies are to a large extent determined by personality, therefore, it is worth considering the dimension of managers’ cognitive functioning. The “ME as manager” construct is a cognitive representation that creates certain tendencies which are visible in a manager’s working style and the resulting effectiveness of their actions.

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Mózg po godzinach: wpływ pracy zmianowej na funkcjonowanie poznawcze pracowników

Nowak K.

Bezpieczeństwo Pracy : nauka i praktyka

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2018

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nr 8

16-20

PL

Liczne doniesienia naukowe wskazują na negatywny wpływ pracy w niestandardowych (zwłaszcza nocnych) godzinach na ogólne funkcjonowanie i zdrowie człowieka. Prezentowany artykuł stanowi próbę podsumowania dotychczasowej wiedzy, dotyczącej wpływu pracy na funkcjonowanie poznawcze pracowników, a uzyskanej na podstawie badań z zastosowaniem obiektywnych metod diagnostycznych. Poruszona została także problematyka różnic indywidualnych w tolerancji na tę formę aktywności, czynników chroniących przed skutkami pracy zmianowej oraz profilaktyki zaburzeń poznawczych

EN

Various sources point out that shift work (especially night shifts) has a negative influence on peoples' health and their everyday functioning. This article strives to start a discussion about the current state of knowledge on the impact of shift work on workers' cognitive functioning, on the basis of studies, which used objective diagnostic methods. It also covers individual differences in tolerance to shift work and prevention of cognitive impairments due to shift work.

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Methods of Estimating the Effect of Integral Motorcycle Helmets on Physiological and Psychological Performance

Bogdan A., Sudoł-Szopińska I., Łuczak A., Konarska M., Pietrowski P.

International Journal of Occupational Safety and Ergonomics

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2012

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Vol. 18, No. 3

329--342

EN

This article proposes a method for a comprehensive assessment of the effect of integral motorcycle helmets on physiological and cognitive responses of motorcyclists. To verify the reliability of commonly used tests, we conducted experiments with 5 motorcyclists. We recorded changes in physiological parameters (heart rate, local skin temperature, core temperature, air temperature, relative humidity in the space between the helmet and the surface of the head, and the concentration of O2 and CO2 under the helmet) and in psychological parameters (motorcyclists’ reflexes, fatigue, perceptiveness and mood). We also studied changes in the motorcyclists' subjective sensation of thermal comfort. The results made it possible to identify reliable parameters for assessing the effect of integral helmets on performance, i.e., physiological factors (head skin temperature, internal temperature and concentration of O2 and CO2 under the helmet) and on psychomotor factors (reaction time, attention and vigilance, work performance, concentration and a subjective feeling of mood and fatigue).