Attention to cardiac sensations enhances the heartbeat-evoked potential during exhalation

iScience, Journal Year: 2024, Volume and Issue: 27(4), P. 109586 - 109586

Published: March 27, 2024

Respiration and cardiac activity intricately interact through complex physiological mechanisms. The heartbeat-evoked potential (HEP) is an EEG fluctuation reflecting the cortical processing of signals. We recently found higher HEP amplitude during exhalation than inhalation a task involving attention to sensations. This may have been due reduced perception heightened attentional To investigate relationships between HEP, attention, respiration, we introduced experimental setup that included tasks related respiratory interoceptive exteroceptive attention. Results revealed increases over fronto-central electrodes. When phases were taken into account, primarily driven by heartbeats recorded exhalation, specifically task, while had minimal impact. These findings emphasize role respiration in could implications for interventions fine-tune interoception.

Language: Английский

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Respiration shapes response speed and accuracy with a systematic time lag

Proceedings of the Royal Society B Biological Sciences, Journal Year: 2025, Volume and Issue: 292(2044)

Published: April 1, 2025

Sensory–cognitive functions are intertwined with physiological processes such as the heart beat or respiration. For example, we tend to align our respiratory cycle expected events actions. This happens during sports but also in computer-based tasks and systematically structures phase around relevant events. However, studies show that trial-by-trial variations shape brain activity speed accuracy of individual responses. We both phenomena—the alignment respiration explanatory power on behaviour—co-exist. In fact, average an relative experimental trials trial-to-trial hold significant predictive behavioural performance, particular for reaction times. co-modulation behaviour emerges regardless whether generally breathes faster slower is strongest about 2 s prior participant’s The persistence these effects across 12 datasets 277 participants performing sensory–cognitive confirms robustness results, suggests a profound time-lagged influence structured sensory–motor

Language: Английский

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The timing of sleep spindles is modulated by the respiratory cycle in humans

Clinical Neurophysiology, Journal Year: 2024, Volume and Issue: 166, P. 252 - 261

Published: July 9, 2024

Coupling of sleep spindles with cortical slow waves and hippocampus sharp-waves ripples is crucial for sleep-related memory consolidation. Recent literature evidenced that nasal respiration modulates neural activity in large-scale brain networks. In rodents, this respiratory drive strongly varies according to vigilance states. Whether oscillations are also respiration-modulated humans remains open. work, we investigated the influence breathing on during non-rapid-eye-movement humans. Full night polysomnography twenty healthy participants were analysed. Spindles automatically detected N2 N3 stages. Spindle-related sigma power as well spindle wave events analysed phase. We found a significant coupling between both fast cycle, enhanced occurrence probability middle part expiration A different was observed negative peaks which rather distributed around two phase transitions. Our findings suggest cycle influences dynamics sleep. This may enable synchronize other facilitate information transfer

Language: Английский

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Signal processing in the vagus nerve: Hypotheses based on new genetic and anatomical evidence

Biological Psychology, Journal Year: 2023, Volume and Issue: 182, P. 108626 - 108626

Published: July 6, 2023

Each organism must regulate its internal state in a metabolically efficient way as it interacts space and time with an ever-changing only partly predictable world. Success this endeavor is largely determined by the ongoing communication between brain body, vagus nerve crucial structure that dialogue. In review, we introduce novel hypothesis afferent engaged signal processing rather than just relay. New genetic structural evidence of vagal fiber anatomy motivates two hypotheses: (1) sensory signals informing on physiological body compute both spatial temporal viscerosensory features they ascend nerve, following patterns found other architectures, such visual olfactory systems; (2) ascending descending modulate one another, calling into question strict segregation motor signals, respectively. Finally, discuss several implications our hypotheses for understanding role predictive energy regulation (i.e., allostasis) well metabolic memory disorders prediction (e.g., mood disorders).

Language: Английский

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Respiratory sinus arrhythmia (RSA), vagal tone and biobehavioral integration: Beyond parasympathetic function

Biological Psychology, Journal Year: 2023, Volume and Issue: 186, P. 108739 - 108739

Published: Dec. 25, 2023

Linchpin to the entire area of psychophysiological research and discussion vagus is respiratory cardiovascular phenomenon known as sinus arrhythmia (RSA; often synonymous with high-frequency heart-rate variability when it specifically linked frequency), i.e. rhythmic fluctuations in heart rate synchronized inspiration expiration. This article aims 1) clarify concepts, terms measures commonly employed during last half century scientific literature, which relate vagal function psychological processes general aspects health; 2) expand upon an earlier theoretical model, emphasizing importance RSA well beyond current focus parasympathetic mechanisms. A close examination its relations may dispel certain held beliefs about associations between functioning, nervous system (for nerve plays a major role), offer fresh perspectives likely functions adaptive significance RSA, RSA's relationship control. neither invariably reliable index cardiac tone nor central outflow heart. The model here presented posits that represents evolutionarily entrenched, significantly contributes meeting continuously changing metabolic, energy behavioral demands.

Language: Английский

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Dynamic mechanisms that couple the brain and breathing to the external environment

Communications Biology, Journal Year: 2024, Volume and Issue: 7(1)

Published: Aug. 3, 2024

Brain and breathing activities are closely related. However, the exact neurophysiological mechanisms that couple brain to stimuli in external environment not yet agreed upon. Our data support synchronization dynamic attunement two key local activity periodic stimuli. First, we review existing literature, which provides strong evidence for of terms coherence, cross-frequency coupling phase-based entrainment. Second, using EEG data, show both lungs localized at Cz channel attune temporal structure their power spectra auditory inputs. We highlight role playing a coordinating tripartite alignment activity, input dynamics across longer timescales like minutes. Overall, this perspective sheds light on potential brain-breathing its environment.

Language: Английский

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Detection of respiratory frequency rhythm in human alpha phase shifts: topographic distributions in wake and drowsy states

Frontiers in Physiology, Journal Year: 2025, Volume and Issue: 15

Published: Jan. 6, 2025

The relationship between brain activity and respiration is recently attracting increasing attention, despite being studied for a long time. Respiratory modulation was evidenced in both single-cell field potentials. Among EEG intracranial measurements, the effect of prevailingly on amplitude/power all frequency bands. Since phases oscillations received less we applied our previously published carrier (CF) mathematical model human alpha group 10 young healthy participants wake drowsy states, using 14-channel average reference montage. approach allows more precise calculation CF phase shifts (CFPS) than any individual Fourier component, by 2-s moving window, validated new method studied, first time, temporal waveforms CFPS(t) their oscillatory content through FFT (CFPS(t)). Although not appearing equally channel pairs every subject, clear peak respiratory region, 0.21-0.26 Hz, observed (max at 0.22 Hz). When five with most prominent averaged amplitudes Hz were plotted topographic distributions changed significantly-from longitudinal, connecting frontal posterior channels state to topographically split two separate regions-frontal state. In addition, state, 0.22-Hz decreased pairs, while statistically significant reduction obtained 20/91 (22%) pairs. These results potentially evidence, shifts, as well impact wakeful consciousness oscillations.

Language: Английский

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ShapeBand: Design of a Shape-Changing Wristband with Soft Materials and Physiological Sensors for Anxiety Regulation

Information, Journal Year: 2025, Volume and Issue: 16(2), P. 101 - 101

Published: Feb. 4, 2025

We introduce ShapeBand, a new shape-changing wristband designed for exploring multisensory and interactive anxiety regulation with soft materials physiological sensing. Our approach takes core principle of self-help psychotherapeutic intervention, aiming to help users recognize triggers engage in attentional distraction. conducted user-centered design activities iteratively refine our requirements delve into users’ rich experiences, preferences, feelings. With we explored bidirectional dynamic interaction flow subjective factors influencing its use. findings suggest that integrating both active passive modulations can significantly enhance user engagement effective intervention. Further, different interactions, characterized by alterations bubbles water the provide gamified experience convey more potent effects. This study provides valuable insights future tangible interfaces be tailored feelings individual needs.

Language: Английский

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Paced Breathing Associated With Pupil Diameter Oscillations at the Same Rate and Reduced Lapses in Attention

Psychophysiology, Journal Year: 2025, Volume and Issue: 62(2)

Published: Feb. 1, 2025

ABSTRACT A dynamical systems model proposes that respiratory, locus coeruleus—noradrenaline (LC‐NA), and cortical attentional interact, producing emergent states of attention. We tested a prediction fixing respiratory pace (versus spontaneous respiration) stabilizes oscillations in pupil diameter (LC‐NA proxy) state. Primary comparisons were between ‘Instructed Breath’ (IB) ‘No Instructed (NIB) groups. Secondarily, we investigated the effects shifting frequency IB group from 0.15 to 0.1–0.15 Hz Experiment 1 ( n = 55) 0.15–0.1 only 2 48) (replication). In Paced Auditory Cue Entrainment (PACE) task, participants heard two auditory tones, alternating higher lower pitches, cycling continuously. Tones acted as breath guide for an attention monitor both Participants gave rhythmic mouse responses transition points tones (left high‐to‐low, right low‐to‐high). derived accuracy click timing (RTm), variability (RTVL), counts erroneously inverting left/right rhythm (IRs Switches). Despite no differences groups RTm or RTVL, committed significantly fewer IRs switches, indicating less lapses during paced breathing. Differences behavioral metrics present across tone cycle frequencies but not exclusive IB, so did appear have specific effect. Pupil closely tracked instructed breathing, implicating LC‐NA activity being entrained by intervention. conclude pacing stabilize attention, possibly through stabilizing fluctuations LC‐NA.

Language: Английский

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A role for respiration in coordinating sleep oscillations and memory consolidation

Trends in Neurosciences, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Memory consolidation is thought to rely on the interplay of sleep-related brain oscillations. Drawing recent findings that highlight influence respiration these rhythms, we outline a framework positioning as pacemaker for sleep's memory function. By orchestrating cardinal non-rapid eye movement (NREM) oscillations, namely slow spindles, and sharp wave-ripples, may coordinate hippocampo-cortical crosstalk essential consolidation.

Language: Английский

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