Search results for "reflex"
showing 10 items of 622 documents
An Empirical Mode Decomposition Approach to Assess the Strength of Heart Period-Systolic Arterial Pressure Variability Interactions.
2020
This work proposes an empirical mode decomposition (EMD) method to assess the strength of the interactions between heart period (HP) and systolic arterial pressure (SAP) variability. EMD was exploited to decompose the original series (OR) into its first, and fastest, intrinsic mode function (IMF1) and the residual (RES) computed by subtracting the IMF1 from OR. EMD procedure was applied to both HP and SAP variability series. Then, the cross correlation function (CCF) was computed over OR, IMF1 and RES series derived from HP and SAP variability in 13 healthy subjects (age 27±8 yrs, 5 males) at rest in supine position (REST) and during head-up tilt (TILT). The first CCF maximum at negative ti…
Partial Information Decomposition in the Frequency Domain: Application to Control Mechanisms of Heart Rate Variability at Rest and During Postural St…
2020
We exploit a recently proposed framework for assessing causal influences in the frequency domain to construct the partial information decomposition (PID) for informational circuits of three variables, thus obtaining the spectral decomposition of redundancy, synergy and unique information. The approach is applied to heart period (HP), systolic pressure (SP) and respiration (RESP) variability series measured in healthy subjects in baseline and head up tilt conditions. Integrating the informational quantities in the respiratory band, the total influence from RESP to HP does not change in the two conditions. However, we find that in baseline RESP causes HP mostly through the direct pathway desc…
La importancia del actor. Reflexiones sobre el porvenir de la historia social
2021
La riflessività e il ‘cervello narrante': un percorso di ricerca con gli studenti universitari
2017
Le ricerche sulla cognizione, sulla competenza metacognitiva e sul funzionamento del cervello non smettono di destare vivo interesse presso la comunità scientifica delle discipline educative specie in rela-zione alla necessità di integrare, in qualsiasi percorso didattico e/o for-mativo, l’irrinunciabile componente della riflessività su se stessi e sul proprio modus di relazione con la conoscenza. Gli approcci di tipo brain-based – con riguardo alla tecnica del Brain-gym – e l’attività di narrazione – declinata secondo la tipologia del Digital Storytelling – costituiscono gli assi portati della ricerca qui descritta, condotta con 205 studenti del secondo anno del corso di laurea in Scienze …
Biografic turning point in lifetime of individuals living in degraded contexts. The role of resilience.
2020
In the course of their lives all people experience events such as the loss of a parent, a child, job or sometimes violence, after which life is no longer the same. In these moments the regular, repetitive and comforting course of life changes because the event is the turning point that changes the direction of the subject's lifetime. The paper is focused on a study of 60 cases in which resilience intervenes in the biographies of individuals, living in conditions of socio-spatial marginality and high social vulnerability, to restore the existential imbalance of a biographical discontinuity represented by a traumatic event. The problem of the research focuses on understanding the role of resi…
PB3. Pharyngeal Electrical Stimulation in neurointensive care patients suffering from severe post-stroke dysphagia – Post stimulation increase of sal…
2018
Introduction Dysphagia is one of the most important and prognostically relevant complications of acute stroke. Pharyngeal Electrical Stimulation (PES) is a treatment device that enhances cortical reorganization for the restoration of swallowing function after cerebral injury. Furthermore, it was shown that PES leads to a temporary increase of Substance P (SP) level in saliva but not serum in healthy adults. The neuropeptide SP likely acts as a neurotransmitter in the pharyngeal mucosa and enhances the swallow and cough reflex. Post-stroke dysphagia may be related to reduced SP-levels. Here, we investigated the association of PES treatment in neurointensive care patients suffering from sever…
Common Sense and phantasia in Antiquity
2013
Questions concerning the scope, content, and richness of perceptual cognition were widely debated in the ancient philosophical schools. More specific problems related to this theme arose from recognition of the obvious fact that the senses alone are insufficient for explaining the variety of human and animal cognition. Whether or not all such cognition should be ascribed to reason was a matter of debate. Most importantly, opinions diverged with respect to the following questions. Do we have perceptual reflexive cognition, that is, do we perceive that we perceive, or is reflexivity an essentially rational capacity? How can the unity of perceptual cognition be explained in light of the fact t…
Input for baroreflex analysis: which blood pressure signal should be used?
2022
The baroreflex (BR) is an important physiological regulatory mechanism which reacts to blood pressure perturbations with reflex changes of target variables such as the heart period (electrocardiogram derived RR interval) or the peripheral vascular resistance (PVR). Evaluation of cardiac chronotropic (RR as a target variable) and vascular resistance (target PVR) BR arms was in previous studies mainly based on the use of the spontaneous variability of the systolic or diastolic blood pressure (SBP, DBP), respectively, as the input signals. The use of other blood pressure measures such as the mean blood pressure (MBP) as an input signal for BR analysis is still under investigation. Making the a…
THE PALMOMENTAL REFLEX IN AMYOTROPHIC LATERA SCLEROSIS
2007
Desistenza dal crimine, riflessività, servizio sociale: considerazioni su una ricerca
2019
This paper analyzes the phenomenon of desistance from crime by deviant young people in some Sicilian cities. In these paths, individual and relational reflexivity is central. This is an original study, which focuses on the importance of the role of social workers as actors capable of strengthening the socio-educational rehabilitation pathways of deviant young people. The author demonstrates how the presence of relational reflexivity in the intervention of social workers and social services contributes to (re)activating in young people an individual reflexivity (proactive, responsible, prosocial) capable of directing them towards objectives of personal growth and adult responsibility.