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LIVRES

Turning the cube : Perspectives on codes through juggling and visual art

Trapp, Franziska ; Van der Laan, Harm ; Tall tales company
Rotterdam : Châlons-en Champagne : Tall Tales Company and Zirkus ; CNAC, 2021

Ce livre s'appuie sur la recherche menée avec l'Université de Münster dans le cadre du projet Reading circus : Dramaturgy on the border between art and academia, initié et organisé par Franziska Trapp, chercheuse en théâtre et culture spécialisée dans le cirque contemporain. En 2019, la compagnie Tall Tales a collaboré avec quinze étudiants du programme de master Poétique culturelle de la littérature et des médias afin de travailler sur la dramaturgie du spectacle Square Two.
Ce livre s'appuie sur la recherche menée avec l'Université de Münster dans le cadre du projet Reading circus : Dramaturgy on the border between art and academia, initié et organisé par Franziska Trapp, chercheuse en théâtre et culture spécialisée dans le cirque contemporain. En 2019, la compagnie Tall Tales a collaboré avec quinze étudiants du programme de master Poétique culturelle de la littérature et des médias afin de travailler sur la ...


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MEMOIRES ET THESES

Braids and juggling patterns

Macauley, Matthew
Claremont, Californie : Harvey Mudd College, 2003

There are several ways to describe juggling patterns mathematically using combinatorics and algebra. In my thesis I use these ideas to build a new system using braid groups. A new kind of graph arises that helps describe all braids that can be juggled. [author summary]


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MEMOIRES ET THESES

A comparison of two methods for teaching three-ball juggling

Catanzariti, Jason C.
Madison : University of Wisconsin, 1998

This study compared two methods for teaching 3-ball juggling to college students. Subjects (Ss) were students enrolled in introductory Physical Education courses at the University of Wisconsin-La Crosse (N = 46), and were divided into 2 experimental groups. Both groups participated in 2 l5-minute juggling lessons. The "wall practice" group juggled while facing a blank wall at a distance of 2 ft. The "nonwall" group juggled while facing a blank wall at a distance of 12 ft. Subjects were tested on 3 occasions: prior to the treatment (pretest), after the treatment (posttest), and following a 1-week interval during which no juggling practice was permitted (retention). A 2-way test of independent samples revealed no significant difference between groups in the pretest (p > .05). A 2-way ANOVA with repeated measures revealed that Ss improved significantly from posttest to retention (p < .05), although improvement was regardless of treatment group. A 2-way ANCOVA determined that the groups' posttest scores were not significantly different (p> .05). It was concluded that wall practice was neither a help nor a hindrance to juggling skill acquisition. Several Ss in the wall group remarked that they felt dependent upon the wall for optimal performance, but the results did not reveal any differences between treatments. [author summary]
This study compared two methods for teaching 3-ball juggling to college students. Subjects (Ss) were students enrolled in introductory Physical Education courses at the University of Wisconsin-La Crosse (N = 46), and were divided into 2 experimental groups. Both groups participated in 2 l5-minute juggling lessons. The "wall practice" group juggled while facing a blank wall at a distance of 2 ft. The "nonwall" group juggled while facing a blank ...


Cote : 793.870 15 C3577c 1998

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ENREGISTREMENTS VIDEO

MRL : Manipulation Research Laboratory

Gilligan, Jay
Fourth Shape, 2014

MANIPULATION RESEARCH LABORATORY –
MRL #1, #2 and #3 MRL was a set of three research laboratories in the field of object manipulation and juggling, that were initiated and organised in Stockholm by jugglers Jay Gilligan, Luke Wilson, Ben Richter and Erik Âberg. The idea was born from an urge to push juggling into the next era and to do this by researching – meaning collecting information to see where it would lead. A decision was taken to make a juggling research project, something that was never seen before in any organized or official sense. MRL #1 took place in 2008 with the aim to define the “Rules of Manipulation”. The four jugglers discovered that juggling as an art form lacked an evolved language to talk about abstract concepts inside of its genre. They managed to invent some rules that seemed “true”, but felt that they ended up mostly talking about composition. So, in 2009 they made MRL #2, an exploration on composition for juggling. This time they discovered that composition was dependent on with what it was done – balls, rings, clubs, diabolo, aso. So consequently, in 2010 MRL #3 was organised – this time about “Tricks & Props”. At the end of MRL #2 they had found that juggling was too undefined and undeveloped to keep having specific topics for research sessions. Language and definitions were needed before getting more specific and trying to see where to go next. So when starting MRL #3 they knew it would be the last one.

The MRL project fed 3 tangible commercial offshoot projects: one series of videos building upon ideas from MRL, the creation of a new commercial company manufacturing new juggling prop shapes and selling performances using them, and finally the use of concepts and findings from MRL in creating performances and other research processes. [editor summary]
MANIPULATION RESEARCH LABORATORY –
MRL #1, #2 and #3 MRL was a set of three research laboratories in the field of object manipulation and juggling, that were initiated and organised in Stockholm by jugglers Jay Gilligan, Luke Wilson, Ben Richter and Erik Âberg. The idea was born from an urge to push juggling into the next era and to do this by researching – meaning collecting information to see where it would lead. A decision was taken to ...


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ARTICLES DE PERIODIQUES

Three-dimensional hand movements during the execution of ball juggling : effect of expertise in street performers

Mapelli, Andrea ; Galante, Domenico ; Paganoni, Simone ; Fusini, Laura ; Forlani, Gianluca ; Sforza, Chiarella
Journal of Electromyography and Kinesiology, 2012

To determine expertise-related differences in performance and movement variability during the execution of closed skill codified tasks, we quantitatively assessed the 3D hand movements of two groups of jugglers with different levels of expertise: six advanced (who could juggle up to 7 balls) and six intermediate jugglers (who could juggle at most with 5 balls). All participants performed three trials for each 3-, 4- and 5-ball juggling schemes. The coordinates of the middle fingers were recorded by an optoelectronic motion analyzer (sampling rate 120 Hz), and were analyzed and compared between groups, number of juggled balls and the spatial decomposition of hand trajectories. The higher the level of expertise, the more stable the hand movements, as the number of juggled balls increased. Advanced jugglers also exhibited lower execution frequencies than intermediate jugglers in each scheme. When the level of difficulty rises, a slower play may be one of the factors accounting for the capability of the advanced jugglers to limit movement variability at the end-effector, and juggle a higher number of balls. [authors summary]
To determine expertise-related differences in performance and movement variability during the execution of closed skill codified tasks, we quantitatively assessed the 3D hand movements of two groups of jugglers with different levels of expertise: six advanced (who could juggle up to 7 balls) and six intermediate jugglers (who could juggle at most with 5 balls). All participants performed three trials for each 3-, 4- and 5-ball juggling schemes. ...


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ARTICLES DE PERIODIQUES

Uncontrolled manifold and Juggling: Retrieving a set of Controlled Variables from Data

Lippi, Vittorio ; Ruffaldi, Emanuele ; Zélic, Gregory ; Lagarde, Julien ; Tripicchio, Paolo ; Avizzano, Carlo Alberto
The International Conference SKILLS, 2011

In this paper we analyze the concept of UnControlled Manifold (UCM), that consists in the kinematic variables that are not controlled by the user, being not relevant to the task. We proceed testing a set of controlled variables inspired by the literature about tracking task, then we propose a procedure to identify them on the basis of captured data.

We are interested in the analysis of behavior in a Virtual Environment and in the real world. In particular we analyze the three ball cascade juggling and its simulation through a platform named Light Weight Juggling focusing on the task of ball tossing.

Users arm kinematics is represented as a robotic manipulator with 7 degrees of freedom. Joint angles are retrieved through an optical tracking system. The variables controlled in the virtual environment are a subset of the ones controlled in the real world, that leads to an UM that differs from the one in the real world. A comparison between the statistics computed in the two cases is performed to explore behavioral differences in the two cases. [authors sumamry]
In this paper we analyze the concept of UnControlled Manifold (UCM), that consists in the kinematic variables that are not controlled by the user, being not relevant to the task. We proceed testing a set of controlled variables inspired by the literature about tracking task, then we propose a procedure to identify them on the basis of captured data.

We are interested in the analysis of behavior in a Virtual Environment and in the real world. In ...


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ARTICLES DE PERIODIQUES

Enumerating (multiplex) juggling sequences

Butler, Steve ; Graham, Ron
2010

We consider the problem of enumerating periodic ?-juggling sequences of length n for multiplex juggling, where ? is the initial state (or {\em landing schedule}) of the balls. We first show that this problem is equivalent to choosing 1's in a specified matrix to guarantee certain column and row sums, and then using this matrix, derive a recursion. This work is a generalization of earlier work of Fan Chung and Ron Graham. [ediotr summary]


Cote : 793.870 15 B9851e 2010

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ARTICLES DE PERIODIQUES

Postural organisation during cascade juggling : influence of expertise

Leroy, D. ; Thouvarecq, R. ; Gautier, G
Elsevier, 2008

The present study investigated how posture is organised during three-ball cascade juggling according to expertise. We hypothesized that the juggling task would place constraints on the postural organisation mode and that the posture-juggling coupling would be increased with expertise. Two groups, intermediates and experts, were asked to perform a postural-cascade juggling task. A three-dimensional motion recording system recorded the position of five light-reflecting markers for 30s to analyse the ball movements, the lateral oscillations of the sacrum and the flexion/extension of the right elbow. The spatial pattern of the cascade juggling showed no significant difference between groups. Moreover, both groups presented lateral oscillations of the sacrum during the task. The latencies between the maximal flexion/extension of the right elbow and the maximal lateral oscillations of the sacrum and their standard deviations were significantly lower for the experts than for the intermediates. We conclude that postural adaptations occur to facilitate the postural-suprapostural task and that experience modifies the posture-juggling coupling. [author summary]
The present study investigated how posture is organised during three-ball cascade juggling according to expertise. We hypothesized that the juggling task would place constraints on the postural organisation mode and that the posture-juggling coupling would be increased with expertise. Two groups, intermediates and experts, were asked to perform a postural-cascade juggling task. A three-dimensional motion recording system recorded the position of ...


Cote : 793.870 15 L619p 2008

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ARTICLES DE PERIODIQUES

Juggling braids and links [complete version]

Devadoss, Satyan L. ; Mugno, John
[2007]


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ARTICLES DE PERIODIQUES

Juggling braids and links

Devadoss, Satyan L. ; Mugno, John
2007


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ARTICLES DE PERIODIQUES

Effect of juggling therapy on anxiety disorders in female patients

Nakahara, Toshihiro ; Nakahara, Kazuhiko ; Uehara, Miho
2007


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ARTICLES DE PERIODIQUES

Pattern stability and error correction duraing in-phase and antiphase four-ball juggling

Dessing, Joost C. ; Daffertshofer, Andreas ; Peper, C. (Lieke) E. ; Beek, Peter J.
2007

The authors studied pattern stability and error correction during in-phase and antiphase 4-ball fountain juggling. To obtain ball trajectories, they made and digitized high-speed film recordings of 4 highly skilled participants juggling at 3 different heights (and thus different frequencies). From those ball trajectories, the authors determined and analyzed critical events (i.e., toss, zenith, catch, and toss onset) in terms of variability of point estimates of relative phase and temporal correlations. Contrary to common findings on basic instances of rhythmic interlimb coordination, in-phase and antiphase patterns were equally variable (i.e., stable). Consistent with previous findings, however, pattern stability decreased with increasing frequency. In contrast to previous results for 3-ball cascade juggling, negative lag-one correlations for catch–catch intervals were absent, but the authors obtained evidence for error corrections between catches and toss onsets. That finding may have reflected participants’ high skill level, which yielded smaller errors that allowed for corrections later in the hand cycle. [authors summary]
The authors studied pattern stability and error correction during in-phase and antiphase 4-ball fountain juggling. To obtain ball trajectories, they made and digitized high-speed film recordings of 4 highly skilled participants juggling at 3 different heights (and thus different frequencies). From those ball trajectories, the authors determined and analyzed critical events (i.e., toss, zenith, catch, and toss onset) in terms of variability of ...


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ARTICLES DE PERIODIQUES

Sensorless stabilization of bounce juggling

Ronsse, Renaud ; Lefèvre, Philippe ; Sepulchre, Rodolphe
février 2006

The paper studies the properties of a sinusoidally vibrating wedge billiard as a model for 2-D bounce juggling. It is shown that some periodic orbits that are unstable in the elastic fixed wedge become exponentially stable in the nonelastic vibrating wedge. These orbits are linked with certain classical juggling patterns, providing an interesting benchmark for the study of the frequency-locking properties in human rhythmic tasks. Experimental results on sensorless stabilization of juggling patterns are described. [authors summary]
The paper studies the properties of a sinusoidally vibrating wedge billiard as a model for 2-D bounce juggling. It is shown that some periodic orbits that are unstable in the elastic fixed wedge become exponentially stable in the nonelastic vibrating wedge. These orbits are linked with certain classical juggling patterns, providing an interesting benchmark for the study of the frequency-locking properties in human rhythmic tasks. Experimental ...


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ARTICLES DE PERIODIQUES

Juggling with pattern matching

Cardinal, Jean ; Kremer, Steve ; Langerman, Stefan
2006


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ARTICLES DE PERIODIQUES

Coordination changes in the early stages of learning to cascade juggle

Haibach, Pamela S. ; Daniels, Gregory L. ; Newell, Karl M.
Elsevier, 2004

The experiment was setup to examine the coordination changes in assembling the movement form of 3-ball cascade juggling. Eight adult participants learned to juggle over 4 weeks of practice. Juggling scores were recorded at each session and performance was videotaped at eight selected sessions for purposes of movement analysis. Once the basic spatial and temporal constraints on cascade juggling were satisfied, and the figure-8 juggling mode was established, temporal modulations of the relative motions of the hands were emphasized. All participants learned to juggle and the increase over practice in the number of consecutive balls caught was best fit with a power law. The non-proportional rate of performance increment was consistent with the qualitative changes in the form of the hand and ball movement kinematics that occurred over practice. [authors summary]
The experiment was setup to examine the coordination changes in assembling the movement form of 3-ball cascade juggling. Eight adult participants learned to juggle over 4 weeks of practice. Juggling scores were recorded at each session and performance was videotaped at eight selected sessions for purposes of movement analysis. Once the basic spatial and temporal constraints on cascade juggling were satisfied, and the figure-8 juggling mode was ...


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ARTICLES DE PERIODIQUES

Temporal and spatial factors reflecting performance improvement during learning three-ball cascade juggling

Hashizume, Ken ; Matsuo, Tomoyuki
Elsevier, 2004

Beek and van Santvoord [Beek, P. J., & van Santvoord, A. A. M. (1992). Journal of Motor Behavior, 24, 85-94] proposed a three-stage model of learning to juggle based on group analyses of temporal measures. Here, we examined in detail how the temporal and spatial features of juggling evolved in eight individual participants progressing from the second to the third stage of learning. During the second stage, the dwell ratio, defined as the ratio of the time that the juggler holds a ball between catch and toss and the hand cycle time (HCT), was stable when it was about 0.83. The subjects with a dwell ratio near this value and controlled throws exhibited stable juggling, whereas the subjects with a dwell ratio of 0.80 or smaller exhibited unstable juggling. Compared to the former group, the latter group had a longer time from the throw of a ball to the arrival at its zenith (TZ), and a shorter time between the arrival of an airborne ball at its zenith and the subsequent throw (IZR). The latter group also exhibited larger variability in the dwell ratio and IZR. With practice, the subjects appropriated, on average, the duration of TZ and IZR to the dwell ratio and improved the ability to accurately throw balls by changing the motions of the limb segments involved. Although these changes helped to stabilize the performance during the second stage, the variability problem was not sufficiently resolved. Only two out of eight subjects passed on to the third stage by the last (10th) Session. They achieved small variability in IZR, dwell ratio, and flight paths of the ball while juggling with short HCTs and small dwell ratios. These results suggest that the reduction of variability in these variables was essential to pass on to the third stage.[authors summary]
Beek and van Santvoord [Beek, P. J., & van Santvoord, A. A. M. (1992). Journal of Motor Behavior, 24, 85-94] proposed a three-stage model of learning to juggle based on group analyses of temporal measures. Here, we examined in detail how the temporal and spatial features of juggling evolved in eight individual participants progressing from the second to the third stage of learning. During the second stage, the dwell ratio, defined as the ratio ...


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Juggling gestures analysis for music control

Willier, Aymeric ; Marque, Catherine
Springer-Verlag, 2002

The aim of this work is to provide jugglers with gestural control of music. This is based on the willing to control music by recycling mastered gestures generated by another art. Therefore we propose the use of a gestural acquisition system based on the processing of the electromyographic signal. The recordings are done during a three-ball cascade, of electromyogram from chosen muscles, which play a specific role in the juggling gesture. Processing of those signals is proposed in order to control musical events by means of parameters related to juggling gesture. [authors sumamry]
The aim of this work is to provide jugglers with gestural control of music. This is based on the willing to control music by recycling mastered gestures generated by another art. Therefore we propose the use of a gestural acquisition system based on the processing of the electromyographic signal. The recordings are done during a three-ball cascade, of electromyogram from chosen muscles, which play a specific role in the juggling gesture. ...


Cote : 793.870 15 W7327j 2002

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ARTICLES DE PERIODIQUES

The coupling between point-of-gaze and ball movements in three-ball cascade juggling : the effects of expertise, pattern and tempo

Huys, Raoul ; Beek, Peter J.
2002

The relationship between point-of-gaze and ball movements in three-ball juggling was examined as a function of expertise, pattern and tempo. Five intermediately skilled and five expert jugglers performed the standard and reverse cascade at three tempos, while point-of-gaze and ball movements were recorded simultaneously. Scaled to the size of the ball patterns, the experts made smaller point-of-gaze movements than the intermediates, especially in the horizontal direction and in the standard cascade. In both skill groups, point-of-gaze and ball movements were often 1 : 1 frequency locked in the horizontal direction, whereas in the vertical direction 1 : 2 frequency locking also occurred. In the latter direction, the 1 : 1 ratio prevailed in the intermediates and the 1 : 2 ratio in the experts. In addition, the incidence of the 1 : 1 ratio decreased and that of the 1 : 2 ratio increased with increasing tempo. Furthermore, in the vertical direction, increasing tempo resulted in a weaker 1 : 1 locking, whereas the strength of the 1 : 2 ratio remained unaffected by tempo. In the horizontal direction, the strength of the 1 : 1 locking was higher on average in the reverse cascade than in the standard cascade. We conclude that expertise in juggling is reflected by an overall reduction in the extent to which the balls are visually tracked, and that task constraints such as tempo and juggling pattern affect the visual search patterns of both expert and intermediate jugglers. [authors summary]
The relationship between point-of-gaze and ball movements in three-ball juggling was examined as a function of expertise, pattern and tempo. Five intermediately skilled and five expert jugglers performed the standard and reverse cascade at three tempos, while point-of-gaze and ball movements were recorded simultaneously. Scaled to the size of the ball patterns, the experts made smaller point-of-gaze movements than the intermediates, especially ...


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Principal components in three-ball cascade juggling

Post, Auke A. ; Daffertshofer, Andreas ; Beek, Peter J.
2000

To uncover the underlying control structure of three-ball cascade juggling, we studied its spatiotemporal properties in detail. Juggling patterns, performed at fast and preferred speeds, were recorded in the frontal plane and subsequently analyzed using principal component analysis and serial correlation techniques. As was expected on theoretical grounds, the principal component analysis revealed that maximally four instead of the original six dimensions (3 balls x 2 planar coordinates) are sufficient for describing the juggling dynamics. Juggling speed was shown to affect the number of dimensions (four for the fast condition, two for the preferred condition) as well as the smoothness of the time evolution of the eigenvectors of the principal component analysis, particularly around the catches. Contrary to the throws and the zeniths, and regardless of juggling speed, consecutive catches of the same hand showed a markedly negative lag-one serial correlation, suggesting that the catches are timed so as to preserve the temporal integrity of the juggling act. [authors summary]
To uncover the underlying control structure of three-ball cascade juggling, we studied its spatiotemporal properties in detail. Juggling patterns, performed at fast and preferred speeds, were recorded in the frontal plane and subsequently analyzed using principal component analysis and serial correlation techniques. As was expected on theoretical grounds, the principal component analysis revealed that maximally four instead of the original six ...


Cote : 793.870 15 P8571p 2000

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Juggling and bouncing balls : parallels and differences in dynamic concepts and tools

Sternad, Dagmar
1999

Two lines of research on the related skills of rhythmic bouncing a ball and juggling three balls were reviewed with the goal to reveal commonalities in the strategy typifying the dynamic systems approach to movement coordination. For both lines of research concepts from nonlinear dynamics and their experimental results were presented in parallel. While there were evident differences in the physical principles and key variables, the dual presentation demonstrated the similarity in the modeling strategy and the methodology. Criteria for dynamically stable solutions defined the boundaries that the actor's movements had to satisfy in order to perform the rhythmic task. Essential in both approaches was that one key variable provided the reference frame for evaluating skilled performance and the process of learning. The role of perceptual information was evaluated by the decrement in stability of performance that selected perceptual manipulations induced. Individual differences between subjects in ball bouncing were shown to be the consequence of their choice of the key variable, which further constrained the kinematic properties across different movement realizations. Individual differences between expert jugglers were interpreted as their "deliberate" choice of a solution that was not tightly constrained by maximum stability but rather one that afforded them more flexibility. This contrasting review aimed to show the spectrum of tools that a dynamic approach has to offer. It further showed that an analysis from a nonlinear dynamic perspective can establish a basis from which a set of important issues in motor control can be addressed, in a quantitative and physically principled manner. [author summary]
Two lines of research on the related skills of rhythmic bouncing a ball and juggling three balls were reviewed with the goal to reveal commonalities in the strategy typifying the dynamic systems approach to movement coordination. For both lines of research concepts from nonlinear dynamics and their experimental results were presented in parallel. While there were evident differences in the physical principles and key variables, the dual ...


Cote : 793.870 15 S8396j 1999

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