Limits...
Brains swinging in concert: cortical phase synchronization while playing guitar.

Lindenberger U, Li SC, Gruber W, Müller V - BMC Neurosci (2009)

Bottom Line: By applying synchronization algorithms to intra- and interbrain analyses, we found that phase synchronization both within and between brains increased significantly during the periods of (i) preparatory metronome tempo setting and (ii) coordinated play onset.Presumably, these couplings reflect similarities in the temporal properties of the individuals' percepts and actions.Whether between-brain oscillatory couplings play a causal role in initiating and maintaining interpersonal action coordination needs to be clarified by further research.

View Article: PubMed Central - HTML - PubMed

Affiliation: Center for Lifespan Psychology, Max Planck Institute for Human Development, Lentzeallee 94, 14195 Berlin, Germany. lindenberger@mpib-berlin.mpg.de

ABSTRACT

Background: 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 that permit the assessment of synchronized neuronal activities at much higher levels of temporal resolution have not yet been simultaneously assessed in multiple individuals and analyzed in the time-frequency domain. In this study, we simultaneously recorded EEG from the brains of each of eight pairs of guitarists playing a short melody together to explore the extent and the functional significance of synchronized cortical activity in the course of interpersonally coordinated actions.

Results: By applying synchronization algorithms to intra- and interbrain analyses, we found that phase synchronization both within and between brains increased significantly during the periods of (i) preparatory metronome tempo setting and (ii) coordinated play onset. Phase alignment extracted from within-brain dynamics was related to behavioral play onset asynchrony between guitarists.

Conclusion: Our findings show that interpersonally coordinated actions are preceded and accompanied by between-brain oscillatory couplings. Presumably, these couplings reflect similarities in the temporal properties of the individuals' percepts and actions. Whether between-brain oscillatory couplings play a causal role in initiating and maintaining interpersonal action coordination needs to be clarified by further research.

Show MeSH
Phase synchronization within and between the brains for the entire music sequence. Acoustic guitar traces (mic) and time-frequency diagrams of average PLI and IPC for guitarists A and B. For analysis, the entire sequence was subdivided into four consecutive sections of equal length. Only significant PLI and IPC values are shown (p < 0.01). The overall significance level was set to the mean value across the four sections. Time is locked to the play onset of the leading guitarist (Guitarist A). In contrast to Figures 1 and 2, the time-frequency diagram is restricted to the frequency range of up to 10 Hz. SL = significance level; Δ = 0.12.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC2662862&req=5

Figure 3: Phase synchronization within and between the brains for the entire music sequence. Acoustic guitar traces (mic) and time-frequency diagrams of average PLI and IPC for guitarists A and B. For analysis, the entire sequence was subdivided into four consecutive sections of equal length. Only significant PLI and IPC values are shown (p < 0.01). The overall significance level was set to the mean value across the four sections. Time is locked to the play onset of the leading guitarist (Guitarist A). In contrast to Figures 1 and 2, the time-frequency diagram is restricted to the frequency range of up to 10 Hz. SL = significance level; Δ = 0.12.

Mentions: To examine synchronization during the playing of the entire piece, we analyzed three further 3s-sequences that were time-locked to the start of guitarist's A onset of play. Significance levels were first determined for each of the four 3s-sequences and then averaged across these sequences (Figure 3). Though synchronization both within and between the brains was considerably reduced relative to the first 2s after play onset, synchronization patterns in delta/theta frequency, especially in the time between the 5th and 8th seconds of the music piece, were found. These synchronization patterns were also related to the onset of the starting note while playing. Interestingly, in the time window between the 8th and 11th seconds, that is, after the end of play, between-brain synchronization disappeared completely.


Brains swinging in concert: cortical phase synchronization while playing guitar.

Lindenberger U, Li SC, Gruber W, Müller V - BMC Neurosci (2009)

Phase synchronization within and between the brains for the entire music sequence. Acoustic guitar traces (mic) and time-frequency diagrams of average PLI and IPC for guitarists A and B. For analysis, the entire sequence was subdivided into four consecutive sections of equal length. Only significant PLI and IPC values are shown (p < 0.01). The overall significance level was set to the mean value across the four sections. Time is locked to the play onset of the leading guitarist (Guitarist A). In contrast to Figures 1 and 2, the time-frequency diagram is restricted to the frequency range of up to 10 Hz. SL = significance level; Δ = 0.12.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2662862&req=5

Figure 3: Phase synchronization within and between the brains for the entire music sequence. Acoustic guitar traces (mic) and time-frequency diagrams of average PLI and IPC for guitarists A and B. For analysis, the entire sequence was subdivided into four consecutive sections of equal length. Only significant PLI and IPC values are shown (p < 0.01). The overall significance level was set to the mean value across the four sections. Time is locked to the play onset of the leading guitarist (Guitarist A). In contrast to Figures 1 and 2, the time-frequency diagram is restricted to the frequency range of up to 10 Hz. SL = significance level; Δ = 0.12.
Mentions: To examine synchronization during the playing of the entire piece, we analyzed three further 3s-sequences that were time-locked to the start of guitarist's A onset of play. Significance levels were first determined for each of the four 3s-sequences and then averaged across these sequences (Figure 3). Though synchronization both within and between the brains was considerably reduced relative to the first 2s after play onset, synchronization patterns in delta/theta frequency, especially in the time between the 5th and 8th seconds of the music piece, were found. These synchronization patterns were also related to the onset of the starting note while playing. Interestingly, in the time window between the 8th and 11th seconds, that is, after the end of play, between-brain synchronization disappeared completely.

Bottom Line: By applying synchronization algorithms to intra- and interbrain analyses, we found that phase synchronization both within and between brains increased significantly during the periods of (i) preparatory metronome tempo setting and (ii) coordinated play onset.Presumably, these couplings reflect similarities in the temporal properties of the individuals' percepts and actions.Whether between-brain oscillatory couplings play a causal role in initiating and maintaining interpersonal action coordination needs to be clarified by further research.

View Article: PubMed Central - HTML - PubMed

Affiliation: Center for Lifespan Psychology, Max Planck Institute for Human Development, Lentzeallee 94, 14195 Berlin, Germany. lindenberger@mpib-berlin.mpg.de

ABSTRACT

Background: 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 that permit the assessment of synchronized neuronal activities at much higher levels of temporal resolution have not yet been simultaneously assessed in multiple individuals and analyzed in the time-frequency domain. In this study, we simultaneously recorded EEG from the brains of each of eight pairs of guitarists playing a short melody together to explore the extent and the functional significance of synchronized cortical activity in the course of interpersonally coordinated actions.

Results: By applying synchronization algorithms to intra- and interbrain analyses, we found that phase synchronization both within and between brains increased significantly during the periods of (i) preparatory metronome tempo setting and (ii) coordinated play onset. Phase alignment extracted from within-brain dynamics was related to behavioral play onset asynchrony between guitarists.

Conclusion: Our findings show that interpersonally coordinated actions are preceded and accompanied by between-brain oscillatory couplings. Presumably, these couplings reflect similarities in the temporal properties of the individuals' percepts and actions. Whether between-brain oscillatory couplings play a causal role in initiating and maintaining interpersonal action coordination needs to be clarified by further research.

Show MeSH