scholarly journals Neurophysiological mechanisms and features of autonomic support of productive cognitive activity of intuitive type in young adults

2021 ◽  
Vol 12 (2) ◽  
pp. 181-191
Author(s):  
Т. O. Tretyak ◽  
І. M. Коfan ◽  
О. M. Znanetska ◽  
F. F. Boyechko ◽  
О. V. Severynovska
Keyword(s):  
Cerebral Cortex ◽  
Right Hemisphere ◽  
Spectral Power ◽  
Cognitive Activity ◽  
Low Frequency ◽  
High Standard ◽  
Female Students ◽  
Intuitive Thinking ◽  
Neurophysiological Mechanisms ◽  
High Level

Is intuition a conscious or subconscious process, a “sixth sense” or a product of learning? This article contains an answer to this question which is based on the disclosure of neurophysiological mechanisms of one of the least understandable types of human cognitive activity. For the first time with the use of cerebral cortex electrical activity mapping, a comprehensive study of the organization of cortical neural networks and the functional state of the autonomic nervous system of female biology students engaged in intuitive thinking has been conducted. The productivity of intuitive thinking is associated with increasing the spectral power of beta2-, delta-, theta-components of the electroencephalogram. The synchronization of the activity of most frequency bands is manifested in the frontal and motor areas of the cortex, which have close connections with the basal ganglia, which are responsible for the formation of skills. In the beta1-band there are probable intrahemispheric long coherences between the anterior and posterior parts of the right hemisphere, at the frequency of beta1,2- and theta-bands of the electroencephalogram they are combined into large cellular ensembles that cover the central-parietal-temporal loci of the cortex. Synchronization of biopotentials in the delta range covers large areas of the cerebral cortex. It has been established that in intuitive thinking the female students with a low standard of efficiency had a high level of central rhythm regulation, and the female students with a high standard of efficiency had a high level of autonomous regulation. Higher performance under intuitive thinking negatively correlated with low frequency findings and positively correlated with high frequency and the value of the square root of the mean squares of the intervals between heartbeats (rMSSD) in the structure of cardiorhythm. Correlation analysis found that productive mental activity is conditioned by the specific integration of cortico-visceral processes: productive intuitive thinking is associated with the activation of autonomic regulation of heart rate variability and coherence in the evolutionarily older delta and delta-theta systems of the brain. Thus, intuition is a scientific set of skills and knowledge, and the topographic signs of synchronization of electrical processes of the cerebral cortex can serve as objective criteria for successful intuitive thinking, which allow one to predict both individual abilities and the state that contributes to their realization.

scholarly journals Features of Bioelectric Activity of the Cerebral Cortex and Thinking Disorders in Children with Various Borderline Disorders of Residual Organic Genesis

2021 ◽  
Vol 14 (1) ◽  
pp. 151-171
Author(s):  
D. Bereskin ◽  
I.A. Gorbunov
Keyword(s):  
Cerebral Cortex ◽  
Spatial Analysis ◽  
Right Hemisphere ◽  
Spectral Power ◽  
Low Frequency ◽  
Bioelectric Activity ◽  
Intellectual Activity ◽  
First Case ◽  
Analysis And Synthesis ◽  
Grammatical Structures

The article presents the results of a study of the features of cognitive function and bioelectric activity cerebral cortex in children with borderline mental disorders of residually organic genesis. 80 children participated with the following diagnoses: organic emotionally labile [asthenic] disorder [F 06.06]; inorganic enuresis [F 98.0], encopresis [F 98.1], stereotypical motor disorders [F 98.4], other specified emotional and behavioral disorders with onset usually occurring in childhood [F 98.8]. The features of bioelectric activity of the cerebral cortex, the ability to spatial analysis and synthesis, arithmetic counting, assimilation of logical and grammatical structures, the presence of viscosity, detail and diversity intellectual activity were studied in children. Data of electroencephalographic examinations were compared with the results of psychodiagnostic methods using the methods of mathematical statistics. Differences of bioelectric activity and features of thinking in children were investigated depending on features of boundary disorder. It is shown that on the background of asthenization more pronounced cognitive impairment is observed. Children with asthenic disorders [06.06] have the largest scatter of data than patients with enuresis [F98.0], encopresis [F 98.1], stereotypical movement disorders [F 98.4], disorders of behavior [F 98.8]. At the same time, on average, they have the most significant violations of thinking, what happens against the background of increasing spectral power of low-frequency activity of delta and theta rhythms in general, as well as of delta rhythm in the frontal part of the brain. Increase of low-frequency activity in the frontal lobes of both hemispheres leads to more pronounced disorders of thinking, than similar changes in the temporal, parietal, occipital regions of the right hemisphere and speech zones of the left hemisphere. In the first case, they are manifested in violations of spatial analysis and synthesis, viscosity, detail and diversity of thinking, as well as in difficulties in the semantic and symbolic activity, in the assimilation of logical and grammatical structures and arithmetic. In the second case — only in violations of spatial analysis and synthesis, viscosity, detail and diversity of thinking.

scholarly journals NEUROPHYSIOLOGICAL MECHANISMS OF LOGONEUROSIS IN PRESCHOOL CHILDREN DURING FUNCTIONAL STRESS

2020 ◽  
Vol 2020 (3) ◽  
pp. 13-19
Author(s):  
Nataliia Vasylieva
Keyword(s):  
Preschool Children ◽  
Electrical Activity ◽  
Spectral Power ◽  
Low Frequency ◽  
Bioelectrical Activity ◽  
Subcortical Structures ◽  
Zonal Distribution ◽  
Neurophysiological Mechanisms ◽  
The Brain ◽  
Functional Stress

The changes in the electrical activity of the brain of boys with different tempo-rhythmic characteristics of speech during functional stress have been studied, namely, a series of flashes of light of a certain frequency – rhythmic photostimulation have been used. The bioelectrical activity of the brain has been studied using a computer electroencephalography system. Also, according to the methodology of zonal distribution of normalized spectral power (SP) of the rhythm of the main frequency of the EEGranges, the particles (in percent) of the normalized SP of electrogenesis in each of the four main ranges (δ, θ, α, β) have been determined. As a result of comparison of the light flashing frequency assimilation among boys in the studied groups, it has been found, that in the group of children with logoneurosis slow rhythms (5 Hz,) lying within the theta-range of the EEG, were better assimilated. The rhythm is assimilated in the low frequency range among the children with logoneurosis. The relative spectral power of theta-rhythm significantly decreased on the EEG of children with tempo and rhythm speech disorder at low-frequency photostimulation in comparison with the corresponding indicators of the background electroencephalogram; the corresponding indicators in the beta-range, anterior and posterior leads in the alpha-rangeincreased. Based on the obtained data, it has been found, that children with logoneurosis have insufficient response to photostimulation. Such data are associated with insufficient inhibitory effect of the cortex on the subcortical structures. The reduced reactivity and functional insufficiency of the activating system of the brain stem have been noted. Neurophysiological mechanisms of logoneurosis are due to the state of insufficient formation of brain structures, which is confirmed by the results of electroencephalography during rhythmic photostimulation. Changes in the tempo and rhythm of speech during logoneurosis of preschool children provoke stress of the brain mechanisms of regulation, which become apparent by special characteristics of the electrical activity of the brain, both at rest and during load.

scholarly journals When brain damage “improves” perception: neglect patients can localize motion-shifted probes better than controls

2015 ◽  
Vol 114 (6) ◽  
pp. 3351-3358 ◽  
Author(s):  
Stefania de Vito ◽  
Marine Lunven ◽  
Clémence Bourlon ◽  
Christophe Duret ◽  
Patrick Cavanagh ◽  
...  
Keyword(s):  
Right Hemisphere ◽  
Visual Fields ◽  
Critical Factor ◽  
Significant Shift ◽  
Stimulus Motion ◽  
Attentional Processes ◽  
Position Shift ◽  
The Right ◽  
High Level ◽  
Better Than

When we look at bars flashed against a moving background, we see them displaced in the direction of the upcoming motion (flash-grab illusion). It is still debated whether these motion-induced position shifts are low-level, reflexive consequences of stimulus motion or high-level compensation engaged only when the stimulus is tracked with attention. To investigate whether attention is a causal factor for this striking illusory position shift, we evaluated the flash-grab illusion in six patients with damaged attentional networks in the right hemisphere and signs of left visual neglect and six age-matched controls. With stimuli in the top, right, and bottom visual fields, neglect patients experienced the same amount of illusion as controls. However, patients showed no significant shift when the test was presented in their left hemifield, despite having equally precise judgments. Thus, paradoxically, neglect patients perceived the position of the flash more veridically in their neglected hemifield. These results suggest that impaired attentional processes can reduce the interaction between a moving background and a superimposed stationary flash, and indicate that attention is a critical factor in generating the illusory motion-induced shifts of location.

Characteristics of heart rate variability in patients with acute coronary syndrome without ST segment elevation in comparison with clinical and biochemical parameters

2021 ◽  
Vol 29 (3) ◽  
pp. 369-378
Author(s):  
Aleksej A. Nizov ◽  
Aleksej I. Girivenko ◽  
Mihail M. Lapkin ◽  
Aleksej V. Borozdin ◽  
Yana A. Belenikina ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Acute Coronary Syndrome ◽  
Creatine Phosphokinase ◽  
Spectral Power ◽  
Low Frequency ◽  
Heart Rhythm ◽  
St Segment Elevation ◽  
Coronary Syndrome ◽  
St Segment

BACKGROUND: The search for rational methods of primary, secondary, and tertiary prevention of coronary heart disease. To date, there are several publications on heart rate variability in ischemic heart disease. AIM: To study the state of the regulatory systems in the organism of patients with acute coronary syndrome without ST segment elevation based on the heart rhythm, and their relationship with the clinical, biochemical and instrumental parameters of the disease. MATERIALS AND METHODS: The open comparative study included 76 patients (62 men, 14 women) of mean age, 61.0 0.9 years, who were admitted to the Emergency Cardiology Department diagnosed of acute coronary syndrome without ST segment elevation. On admission, cardiointervalometry was performed using Varicard 2.51 apparatus, and a number of clinical and biochemical parameters were evaluated RESULTS: Multiple correlations of parameters of heart rate variability and clinical, biochemical and instrumental parameters were observed. From this, a cluster analysis of cardiointervalometry was performed, thereby stratifying patients into five clusters. Two extreme variants of dysregulation of the heart rhythm correlated with instrumental and laboratory parameters. A marked increase in the activity of the subcortical nerve centers (maximal increase of the spectral power in the very low frequency range with the underlying reduction of SDNN) in cluster 1 was associated with reduction of the left ventricular ejection fraction: cluster 147.0 [40.0; 49.0], cluster 260.0 [58.0; 64.0], cluster 360.0 [52.5; 64.5] % (the data are presented in the form of median and interquartile range; Me [Q25; Q75], p 0,05). Cluster 5 showed significant reduction in SDNN (monotonous rhythm), combined with increased level of creatine phosphokinase (CPC): cluster 5446,0 [186.0; 782.0], cluster 4141.0 [98.0; 204.0] IU/l; Me [Q25; Q75], p 0.05) and MВ-fraction of creatine phosphokinase; cluster 532.0 [15.0; 45.0], 4 cluster 412.0 [9.0; 18.0] IU/l; Me [Q25; Q75], p 0.05). CONCLUSIONS: In patients with acute coronary syndrome without ST segment elevation, cluster analysis of parameters of heart rate variability identified different peculiarities of regulation of the heart rhythm. Pronounced strain of the regulatory systems of the body was found to be associated with signs of severe pathology: the predominance of VLF (spectral power of the curve enveloping a dynamic range of cardiointervals in the very low frequency range) in spectral analysis with an underlying reduced SDNN is characteristic of patients with a reduced ejection fraction, and a monotonous rhythm is characteristic of patients with an increased level of creatine phosphokinase and MB-fraction of creatine phosphokinase.

Academic Achievement of Female Students at College Level In Relation to Their Family Environment And Locale

2021 ◽  
pp. 51-65
Author(s):  
Nishta Rana ◽  
Shivani Kapoor
Keyword(s):  
Academic Achievement ◽  
Academic Success ◽  
Family Environment ◽  
Sampling Technique ◽  
Female Students ◽  
College Level ◽  
Family Environment Scale ◽  
Environment Scale ◽  
The Family ◽  
High Level

Academic achievement is often considered as a key criterion to judge one's total potentialities and capabilities. Academic achievement has become a prime interest for the teachers, educationists, psychologists and parents to predict children's academic success which is considered to be an outcome of the learning environment and the family. The present study aimed at seeking the level of academic achievement of female students at the college level with respect to their family environment and locale. Random Sampling Technique was applied to draw the sample of 200 female students studying in the five-degree colleges of Jammu City (J&K) in the year 2015. Family Environment Scale (FES-BC) by Bhatia and Chadha (2012) was used for data collection. This tool has eight dimensions-Cohesion, Expressiveness, Conflict, Acceptance and Caring, Independence, Active-Recreational Orientation, Organisation and Control. The findings revealed that most of the female students were having an average level of academic achievement. Very few female students were found to have a high level of academic achievement. No significant differences in the level of academic achievement were found among female students in relation to their residential background, whereas significant differences were found in the family environment of female students with respect to the locality at the sub-scale “Acceptance and Caring” and “Active Recreational Orientation”. The value of the coefficient of correlation was found to be low, positive but significant at the 0.01 level of significance at the sub-scale “Cohesion” of Family Environment Scale. It shows that academic achievement and cohesion in the family are positively related with each other, however, the correlation is low.

Inspiratory resistance delays the reporting of symptoms with central hypovolemia: association with cerebral blood flow

2007 ◽  
Vol 293 (1) ◽  
pp. R243-R250 ◽  
Author(s):  
Caroline A. Rickards ◽  
Kathy L. Ryan ◽  
William H. Cooke ◽  
Keith G. Lurie ◽  
Victor A. Convertino
Keyword(s):  
Blood Flow ◽  
Cerebral Blood Flow ◽  
Cerebral Blood Flow Velocity ◽  
Lower Body Negative Pressure ◽  
Spectral Power ◽  
Human Subjects ◽  
Low Frequency ◽  
Cardiovascular Collapse ◽  
Absolute Level ◽  
Inspiratory Resistance

We tested the hypothesis that breathing through an inspiratory threshold device (ITD) during progressive central hypovolemia would protect cerebral perfusion and attenuate the reporting of presyncopal symptoms. Eight human subjects were exposed to lower-body negative pressure (LBNP) until the presence of symptoms while breathing through either an active ITD (−7 cmH2O impedance) or a sham ITD (0 cmH2O). Cerebral blood flow velocity (CBFV) was measured continuously via transcranial Doppler and analyzed in both time and frequency domains. Subjects were asked to report any subjective presyncopal symptoms (e.g., dizziness, nausea) at the conclusion of each LBNP exposure. Symptoms were coincident with physiological evidence of cardiovascular collapse (e.g., hypotension, bradycardia). Breathing on the active ITD increased LBNP tolerance time (mean ± SE) from 2,014 ± 106 s to 2,259 ± 138 s ( P = 0.006). We compared CBFV responses at the time of symptoms during the sham ITD trial with those at the same absolute time during the active ITD trial (when there were no symptoms). While there was no difference in mean CBFV at these time points (sham, 44 ± 4 cm/s vs. active, 47 ± 4; P = 0.587), total oscillations (sum of high- and low-frequency spectral power) of CBFV were higher ( P = 0.004) with the active ITD (45.6 ± 10.2 cm/s2) than the sham ITD (22.1 ± 5.4 cm/s2). We conclude that greater oscillations around the same absolute level of mean CBFV are induced by inspiratory resistance and may contribute to the delay in symptoms and cardiovascular collapse that accompany progressive central hypovolemia.

scholarly journals Marmoset invariant object recognition behavior mirrors that of humans and macaques at fine scale

2020 ◽  
Author(s):  
Alexander J.E. Kell ◽  
Sophie L. Bokor ◽  
You-Nah Jeon ◽  
Tahereh Toosi ◽  
Elias B. Issa
Keyword(s):  
Object Recognition ◽  
Model Organism ◽  
High Standard ◽  
Visual Object ◽  
Visual Object Recognition ◽  
Visual Neuroscience ◽  
Brain Functions ◽  
Invariant Object Recognition ◽  
Small Model ◽  
High Level

The marmoset—a small monkey with a flat cortex—offers powerful techniques for studying neural circuits in a primate. However, it remains unclear whether brain functions typically studied in larger primates can be studied in the marmoset. Here, we asked whether the 300-gram marmosets’ perceptual and cognitive repertoire approaches human levels or is instead closer to rodents’. Using high-level visual object recognition as a testbed, we found that on the same task marmosets substantially outperformed rats and generalized far more robustly across images, all while performing ∼1000 trials/day. We then compared marmosets against the high standard of human behavior. Across the same 400 images, marmosets’ image-by-image recognition behavior was strikingly human-like—essentially as human-like as macaques’. These results demonstrate that marmosets have been substantially underestimated and that high-level abilities have been conserved across simian primates. Consequently, marmosets are a potent small model organism for visual neuroscience, and perhaps beyond.

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