Viktor Müller's research while affiliated with Max Planck Institute for Human Development and other places

Publications (81)

Article
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Singing in a choir has long been known to enhance well-being and protect mental health. Clearly, the experience of a uniquely harmonious social activity is very satisfying for the singers. How might this come about? One of the important factors positively associated with well-being is interpersonal action coordination allowing the choir to function...
Article
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Musical ensemble performances provide an ideal environment to gain knowledge about complex human interactions. Network structures of synchronization can reflect specific roles of individual performers on the one hand and a higher level of organization of all performers as a superordinate system on the other. This study builds on research on joint s...
Article
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Mounting neurophysiological evidence suggests that interpersonal interaction relies on continual communication between cell assemblies within interacting brains and continual adjustments of these neuronal dynamic states between the brains. In this Hypothesis and Theory article, a Hyper-Brain Cell Assembly Hypothesis is suggested on the basis of a c...
Article
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Playing music in an ensemble is a highly coordinated human action involving musicians' brain-body interactions at different levels of physical and cortical organization in time and space. It has been suggested that interbrain phase synchronization plays an essential role in musical interaction. In this study, we aimed to explore associations betwee...
Article
It is now widely accepted that inter-brain synchronization is an important and inevitable mechanism of interpersonal action coordination and social interaction behavior. This review of the current literature focuses first on the forward model for interpersonal action coordination and functional system theory for biological systems, two broadly simi...
Article
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Neurophysiological evidence shows that interpersonal action coordination is accompanied by interbrain synchronization (IBS). However, the functional significance of this association remains unclear. Using two experimental designs, we explored whether IBS is amenable to neurofeedback (NFB). Feedback was provided either as two balls approaching each...
Preprint
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We live in a social world where we interact with each other. Neurofeedback (NFB) is an indispensable element for such interaction. Single-person NFB studies using electroencephalography (EEG) or other neuroimaging recordings were extensively reported. However, hyperscanning studies using inter-brain synchrony (IBS) as an NFB feature are completely...
Article
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Playing music in ensemble requires enhanced sensorimotor coordination and the non-verbal communication of musicians that need to coordinate their actions precisely with those of others. As shown in our previous studies on guitar duets, and also on a guitar quartet, intra- and inter-brain synchronization plays an essential role during such interacti...
Article
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Behavioral and physiological evidence suggests that developmental changes lead to enhanced cortical differentiation and integration through maturation and learning, and that senescent changes during aging result in dedifferentiation and reduced cortical specialization of neural cell assemblies. We used electroencephalographic (EEG) recordings to ev...
Article
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Choral singing requires the coordination of physiological subsystems within and across individuals. Previously, we suggested that the choir functions as a superordinate system that imposes boundary conditions on the dynamic features of the individual singers and found reliable differences in the network topography by analyzing within- and cross-fre...
Article
Choir singing is positively associated with well‐being and quality of life, and requires the coordination of physiological systems within and across individuals. Informed by models of interpersonal action coordination, we delineate the network topography of choir singing by analyzing cross‐frequency couplings and within‐frequency couplings (WFCs) o...
Article
When playing music in an ensemble, musicians need to precisely coordinate their actions with one another. As shown in our previous studies on guitar duets, interbrain synchronization plays an essential role during such interactions. In this study, we simultaneously recorded electroencephalograms from four guitarists during quartet playing, to explo...
Article
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We walk together, we watch together, we win together: Interpersonally coordinated actions are omnipresent in everyday life, yet the associated neural mechanisms are not well understood. Available evidence suggests that the synchronization of oscillatory activity across brains may provide a mechanism for the temporal alignment of actions between two...
Data
Natural static happy expression of one of the actresses. (MOV)
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Ensemble of supporting information figures and tables. It contains supporting information Figures A-H, and Tables A-G as referred to in the text. (PDF)
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Unnatural dynamic happy expression of one of the actresses. (MOV)
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Natural dynamic happy expression of one of the actresses. (MOV)
Article
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Research on the perception of facial emotional expressions (FEEs) often uses static images that do not capture the dynamic character of social coordination in natural settings. Recent behavioral and neuroimaging studies suggest that dynamic FEEs (videos or morphs) enhance emotion perception. To identify mechanisms associated with the perception of...
Article
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Working memory (WM) is crucial for intelligent cognitive functioning, and synchronization phenomena in the fronto-parietal network have been suggested as an underlying neural mechanism. In an attempt to provide causal evidence for this assumption, we applied transcranial alternating current stimulation (tACS) at theta frequency over fronto-parietal...
Article
Working together feels easier with some people than with others. We asked participants to perform a visual search task either alone or with a partner while simultaneously measuring each participant's EEG. Local phase synchronization and inter-brain phase synchronization were generally higher when subjects jointly attended to a visual search task th...
Article
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Background: Multiscale entropy (MSE) estimates the predictability of a signal over multiple temporal scales. It has been recently applied to study brain signal variability, notably during aging. The grounds of its application and interpretation remain unclear and subject to debate. Method: We used both simulated and experimental data to provide an...
Article
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Resting-state and task-related recordings are characterized by oscillatory brain activity and widely distributed networks of synchronized oscillatory circuits. Electroencephalographic recordings (EEG) were used to assess network structure and network dynamics during resting state with eyes open and closed, and auditory oddball performance through p...
Article
Phase synchronization of neuronal oscillations is a fundamental mechanism underlying cognitive processing and behavior, including context-dependent response production and inhibition. Abnormalities in neural synchrony can lead to abnormal information processing and contribute to cognitive and behavioral deficits in neuropsychiatric disorders. Howev...
Conference Paper
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Behavioral research shows that two person teams can perform a visual search task more efficiently than two individuals working independently (Brennan & Enns, 2014). Here we use EEG hyperscanning with the same behavioral method to measure within- and between-brain phase synchronization in the brains of individuals working as a team or alone....
Article
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The present work focused on the study of fluctuations of cortical activity across time-scales in young and older healthy adults. The main objective was to offer a comprehensive characterization of the changes of brain (cortical) signals variability during aging and make the link with known underlying structural, neurophysiological and functional mo...
Article
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Coordinated social interaction is associated with, and presumably dependent on, oscillatory couplings within and between brains, which, in turn, consist of an interplay across different frequencies. Here, we introduce a method of network construction based on the cross-frequency coupling (CFC) and examine whether coordinated social interaction is a...
Article
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We propose that a comprehensive understanding of age differences in affective responses to emotional situations requires the distinction of 2 components of affect dynamics: reactivity, the deviation from a person's baseline, and recovery, the return to this baseline. The present study demonstrates the utility of this approach with a focus on age di...
Article
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We investigated age differences in associations among self-reported experiences of tense and energetic arousal, physiological activation indicated by heart rate, and working-memory performance in everyday life. The sample comprised 92 participants aged 14-83 years. Data were collected for 24 hr while participants pursued their normal daily routines...
Article
Full-text available
Humans interact with the environment through sensory and motor acts. Some of these interactions require synchronization among two or more individuals. Multiple-trial designs, which we have used in past work to study interbrain synchronization in the course of joint action, constrain the range of observable interactions. To overcome the limitations...
Article
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Information processing in the brain is thought to rely on the convergence and divergence of oscillatory behaviors of widely distributed brain areas. This information flow is captured in its simplest form via the concepts of synchronization and desynchronization and related metrics. More complex forms of information flow are transient synchronizatio...
Article
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To investigate whether directionality in hyperbrain networks reflects different roles during interpersonal action coordination (IAC), we recorded EEG data from pairs of guitarists playing together as musical leaders versus followers. We used an asymmetric index of in-phase synchronization to analyze hyperbrain networks of directed functional connec...
Article
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Maximizing gains during probabilistic reinforcement learning requires the updating of choice - outcome expectations at the time when the feedback about a specific choice or action is given. Extant theories and evidence suggest that dopaminergic modulation plays a crucial role in reinforcement learning and the updating of choice - outcome expectatio...
Data
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Maximizing gains during probabilistic reinforcement learning requires the updating of choice – outcome expectations at the time when the feedback about a specific choice or action is given. Extant theories and evidence suggest that dopaminergic modulation plays a crucial role in reinforcement learning and the updating of choice – outcome expec- tat...
Article
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Two studies investigated the overpowering hypothesis as a possible explanation for the currently inconclusive empirical picture on age differences in affective responding to unpleasant events. The overpowering hypothesis predicts that age differences in affective responding are particularly evident in highly resource-demanding situations that overt...
Article
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The reliability, stability, and signal-to-noise ratio (SNR) of event-related potentials (ERPs) were investigated in children, adolescents, younger adults, and older adults in performance monitoring tasks. P2, N2, P3, and P2-N2 peak-to-peak amplitude showed high odd-even split reliabilities in all age groups, ranging from.70 to.90. Multigroup analys...
Article
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To further test and explore the hypothesis that synchronous oscillatory brain activity supports interpersonally coordinated behavior during dyadic music performance, we simultaneously recorded the electroencephalogram (EEG) from the brains of each of 12 guitar duets repeatedly playing a modified Rondo in two voices by C.G. Scheidler. Indicators of...
Article
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Interest in the effects of sleeping behavior on health and performance is continuously increasing-both in research and with the general public. Ecologically valid investigations of this research topic necessitate the measurement of sleep within people's natural living contexts. We present evidence that a new approach for ambulatory accelerometry da...
Article
Electroencephalographic recordings (EEG) were used to assess age-associated differences in nonlinear brain dynamics during both rest and auditory oddball performance in children aged 9.0-12.8 years, younger adults, and older adults. We computed nonlinear coupling dynamics and dimensional complexity, and also determined spectral alpha power as an in...
Data
Intertrial phase synchronization in Warning and Neutral task conditions. Grand-averaged stimulus-locked time-frequency diagrams of Phase Locking Index (PLI) under Warning (upper row) and Neutral (middle row) conditions and the Warning minus Neutral difference (bottom row). Topological distribution of the PLI for the two frequency bands and the two...
Article
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Inhibition of irrelevant information (conflict monitoring) and/or of prepotent actions is an essential component of adaptive self-organized behavior. Neural dynamics underlying these functions has been studied in humans using event-related brain potentials (ERPs) elicited in Go/NoGo tasks that require a speeded motor response to the Go stimuli and...
Article
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To reveal the neural and behavioral dynamics of social interaction, single-person studies are increasingly complemented by research designs that simultaneously assess two or more interacting individuals. In this article, we review studies on neural mechanisms and markers of social interactions that use multi-person functional magnetic resonance ima...
Data
Out- and in-strengths as well as the difference between them for HRV ICI and GC measures during the different singing conditions. a, strengths for ICI measure during song singing. b, strengths for GC measure during song singing. c, strengths for ICI measure during canon singing. d, strengths for GC measure during canon singing. (S_uni = singing son...
Data
Connectivity networks and modularity effects during singing of the song in the three 100-s consecutive time intervals. PSI and ACI were determined at the moderate frequency of 0.11 Hz. The colored areas display the partition of the networks into modules. a, the first 100-s time interval. The modularity M is zero, and the choir could not be divided...
Data
Synchronization patterns of HRV under the different task conditions for the five frequencies of interest. A - E, Frequencies of interest: 0.03, 0.05, 0.08, 0.11, and 0.16 Hz. a, Rest condition; b, Song singing in unison; c, Song with choral singing; d, Canon singing in unison; e, Choral singing of the canon with eyes open; f, Choral singing of the...
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Experimental design and procedure with position of the choir participants and the conductor in the choir during singing as well as the order of test conditions. (DOC)
Data
Out- and in-degrees as well as the difference between them for HRV ICI and GC measures during the different singing conditions. a, degrees for ICI measure during song singing. b, degrees for GC measure during song singing. c, degrees for ICI measure during canon singing. d, degrees for GC measure during canon singing. (S_uni = singing song in uniso...
Data
Out- and In-degrees as well as the difference between them for respiration ICI and GC measures during the different singing conditions. a, degrees for ICI measure during song singing. b, degrees for GC measure during song singing. c, degrees for ICI measure during canon singing. d, degrees for GC measure during canon singing. (S_uni = singing song...
Article
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Dyadic and collective activities requiring temporally coordinated action are likely to be associated with cardiac and respiratory patterns that synchronize within and between people. However, the extent and functional significance of cardiac and respiratory between-person couplings have not been investigated thus far. Here, we report interpersonal...
Data
Position of the choir participants and the conductor in the choir during singing. This movie shows the simultaneous video and electrophysiological recordings of the choir while singing a four-part song (“Sally Gardens” in D major, Irish Folksong). ECG (ECG01-ECG12) and respiration (ATM01-ATM12) of a conductor and eleven singers as well as the hand...
Data
Cleaning procedure to eliminate accidental synchronization points. a, Synchronization pattern before cleaning. b, Synchronization pattern after cleaning. Note that during this cleaning procedure, successive points in the defined range (between -π/4 and +π/4) with a time interval shorter than the period of the corresponding oscillation at the given...
Data
Out- and In-strengths as well as the difference between them for respiration ICI and GC measures during the different singing conditions. a, strengths for ICI measure during song singing. b, strengths for GC measure during song singing. c, strengths for ICI measure during canon singing. d, strengths for GC measure during canon singing. (S_uni = sin...
Data
Directed connectivity networks for HRV ICI and GC measures during the different singing conditions. a, singing song in unison. b, singing a four-part song. c, singing canon in unison. d, singing a three-part canon with eyes open. e, singing a three-part canon with eyes closed. ICI-based networks are displayed at the left, and the GC-based networks...
Data
Synchronization patterns of respiration under the different task conditions for the five frequencies of interest. A - E, Frequencies of interest: 0.03, 0.05, 0.08, 0.11, and 0.16 Hz, respectively. a, song singing in unison. b, singing of the song in four parts. c, single canon entry sung in unison. d, canon singing with eyes open. e, canon singing...
Data
Graphic representation of statistical results. Means and standard error bars of the four synchronization measures (PSI, ACI, ICI, and GC) are displayed for respiration (left column) and HRV (right column) under the six different task conditions (Rest, S_uni, S_cho, C_uni, C_eo, and C_ec) and for the six frequencies of interest (0.03, 0.05, 0.08, 0....
Article
Full-text available
By recording the feedback-related negativity (FRN) in response to gains and losses, we investigated the contribution of outcome monitoring mechanisms to age-associated differences in probabilistic reinforcement learning. Specifically, we assessed the difference of the monitoring reactions to gains and losses to investigate the monitoring of outcome...
Article
We recorded Electroencephalograms (EEGs) during a cued Continuous Performance Task (CPT) to investigate lifespan differences in the efficiency of response conflict processing under conditions that put high demands on the ability to suppress a prepotent response. Previous evidence indicates that children and adolescents commit more errors under such...
Article
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The structural and functional brain circuitries supporting episodic memory undergo profound reorganization in childhood and old age. We propose a two-component framework that combines and integrates evidence from child development and aging. It posits that episodic memory builds on two interacting components: (a) the strategic component, which refe...
Article
Using electroencephalographic recordings (EEG), we assessed differences in oscillatory cortical activity during auditory-oddball performance between children aged 9-13 years, younger adults, and older adults. From childhood to old age, phase synchronization increased within and between electrodes, whereas whole power and evoked power decreased. We...
Article
To investigate lifespan age differences in neuronal mechanisms of visual coding in the context of perceptual discrimination. We recorded EEG from 17 children (10-12 years), 16 younger adults (20-26 years), and 17 older adults (70-76 years) during a simple choice-reaction task requiring discrimination of squares and circles of different sizes. We ex...
Data
Supplemental data. Four Figures (S1, S2, S3, and S4) with corresponding legends are contained within the file. The Figures show the effects described in the paper in all eight guitarists pairs investigated in the study.
Data
Supplemental movie. This movie shows the simultaneous video and EEG recordings of a pair of guitarists playing together for three trials. EEG from six channels (F3, Fz, F4, C3, Cz, C4) of both guitarist (a and b) as well as microphone recordings of guitar A (micA) and B (micB) are shown. The trial started with four metronome beats followed by the l...
Article
Full-text available
Brains interact with the world through actions that are implemented by sensory and motor processes. A substantial part of these interactions consists in synchronized goal-directed actions involving two or more individuals. Hyperscanning techniques for assessing fMRI simultaneously from two individuals have been developed. However, EEG recordings th...
Article
Full-text available
Age gradient of the mechanism of stimulus-response conflict cost was investigated in a population-based representative sample of 291 individuals, covering the age range from 6 to 89 years. Stimulus-response conflict cost, indicated by the amount of additional processing time required when there is a conflict between stimulus and response options, f...
Article
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The authors examined lifespan differences in the maintenance of skilled episodic memory performance by assessing 100 individuals (10 –11, 12–13, 21–26, and 66 –79 years old) 11 months after termination of an intensive multisession mnemonic training program (Y. Brehmer, S.-C. Li, V. Müller, T. von Oertzen, & U. Lindenberger, 2007). Skill maintenance...
Article
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To study how event-related brain potentials (ERPs) and underlying cortical mechanisms of selective attention change from childhood to old age, we investigated lifespan age differences in ERPs during an auditory oddball task in four age groups including 24 younger children (9-10 years), 28 older children (11-12 years), 31 younger adults (18-25), and...
Article
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Memory plasticity, or the ability to improve one's memory performance through instruction and training, is known to decline during adulthood. However, direct comparisons among middle childhood, adulthood, and old age are lacking. The authors examined memory plasticity in an age-comparative multisession training study. One hundred and eight particip...