Using humanoid robots to study human behavior

Our understanding of human behavior advances as our humanoid robotics work progresses-and vice versa. This team's work focuses on trajectory formation and planning, learning from demonstration, oculomotor control and interactive behaviors. They are programming robotic behavior based on how we humans “program” behavior in-or train-each other

Polyrhythmic Pathways: Using Bimanual Coordination Research to Develop a New Framework for Practice, Performance, and Pedagogy

This study reviews and compares percussion literature pertaining to polyrhythms and scientific literature pertaining to bimanual coordination. There exists a gap in the pedagogical approach to polyrhythms, and there is much disagreement between common instructional methods, especially when considered against the findings of several bimanual coordination studies. The purpose of this study is to reveal insight to the percussion community that the learning of polyrhythms is facilitated by the brain in novel ways, and the uniqueness of this learning process requires a rethinking of the current pedagogical approach. Percussion articles, method books, popular literature, and music scores are surveyed alongside primarily neuroscience research on bimanual coordination regarding the nervous system, perception, feedback, and error. The results show that limb independence as a concept must be divorced from polyrhythmic coordination, and tools used in the learning process must promote an internalization of the polyrhythm as a composite coordination pattern. The implications of this study are that a unique curricular approach is necessary for polyrhythmic learning, and, though antithetical to common practice methods, a brute-force approach may be optimal for idiosyncratic coordination patterns in the percussion musical literature

The rhythm that unites: an empirical investigation into synchrony, ritual, and hierarchy

Synchrony, or rhythmic bodily unison activities such as drumming or cadence marching, has attracted growing scholarly interest. Among laboratory subjects, synchrony elicits prosocial responses, including altruism and empathy. In light of such findings, researchers in social psychology and the bio-cultural study of religion have suggested that synchrony played a role in humanity’s evolutionary history by engendering collectivistic commitments and social cohesion. These models propose that synchrony enhances cohesion by making people feel united. However, such models overlook the importance of differentiated social relations, such as hierarchies. This dissertation builds on this insight by drawing on neuroscience, coordination dynamics, social psychology, anthropology, and ritual studies to generate a complex model of synchrony, ritual, and social hierarchy, which is then tested in an experimental study. In the hypothesized model, shared motor unison suppresses the brain’s ability to distinguish cognitively between self-caused and exogenous motor acts, resulting in subjective self-other overlap. During synchrony each participant is dynamically entrained to a group mean rhythm; this “immanent authority” prevents any one participant from unilaterally dictating the rhythm, flattening relative hierarchy. As a ritualized behavior, synchrony therefore paradigmatically evokes shared ideals of equality and unity. However, when lab participants were assigned to either a synchrony or asynchrony manipulation and given a collaborative task requiring complex coordination, synchrony predicted a marginally lower degree of collaboration and significantly lower interpersonal satisfaction. These findings imply that unity and equality can undercut group cohesion if the collective agenda is a shared goal that requires interpersonal coordination. My results emphasize that, despite the inevitable tensions associated with social hierarchy, complementary roles and hierarchy are vital for certain aspects of social cohesion. Ritual and convention institute social boundaries that can be adroitly negotiated, even as egalitarian effervescence such as communitas (in the sense of Victor Turner) facilitates social unity and inspires affective commitments. These findings corroborate theories in ritual studies and sociology that caution both against excessive emphasis on inner emotive states (such as empathy) and against excessively rigid conventions or roles. An organic balance between unity and functional differentiation is vital for genuinely robust, long-term social cohesion.2018-06-21T00:00:00

Searching for Roots of Entrainment and Joint Action in Early Musical Interactions

When people play music and dance together, they engage in forms of musical joint action that are often characterized by a shared sense of rhythmic timing and affective state (i.e., temporal and affective entrainment). In order to understand the origins of musical joint action, we propose a model in which entrainment is linked to dual mechanisms (motor resonance and action simulation), which in turn support musical behavior (imitation and complementary joint action). To illustrate this model, we consider two generic forms of joint musical behavior: chorusing and turn-taking. We explore how these common behaviors can be founded on entrainment capacities established early in human development, specifically during musical interactions between infants and their caregivers. If the roots of entrainment are found in early musical interactions which are practiced from childhood into adulthood, then we propose that the rehearsal of advanced musical ensemble skills can be considered to be a refined, mimetic form of temporal and affective entrainment whose evolution begins in infancy

An Investigation of Drummers’ Trunk and Upper Limb Muscle Activation Profiles During High-Velocity Cymbal Crashes

Drumming is a physically demanding activity, and skilled drummers share many physical and cognitive attributes with elite athletes. The “double pulse” muscle activation (DPMA) pattern is a motor control strategy that has been observed in athletes of sports involving ballistic movements, such as baseball, golf, and elite Mixed Martial Arts fighters. The two pulses are believed to function to increase striking velocity and effective mass, thus increasing force transfer onto the target. The purpose of this study was to examine the muscle activation patterns of highly skilled drummers for evidence of a DPMA during high-velocity cymbal crashes. Three highly skilled drummers were instrumented with EMG electrodes on the right latissimus dorsi, triceps brachii, erector spinae, rectus abdominis, deltoideus posterior (DP), teres major (TM), flexor carpi ulnaris, and extensor carpi radialis muscles. Six trials of data were collected, including a resting baseline, three maximum voluntary exertions (MVE) consisting of maximal effort cymbal crashes, a drumming pattern that included multiple crashes, and a free play trial. The DPMA waveform was observed in all trials, but the MVE trials were the only trials where DPMAs were confirmed to coincide with the crashing movement via video analysis. The DP and TM muscles exhibited the DPMA the most frequently, with both muscles functioning to extend the shoulder joint to crash the stick onto the cymbal. The extent to which drummers use the DPMA motor control strategy to produce high velocity cymbal crashes safely and efficiently in authentic playing conditions is inconclusive and needs further examination. Future study of the DPMA phenomenon in drummers would benefit from the addition of 3-dimensional motion capture systems (e.g., the Xsens Awinda™) to further understand the purpose of the muscle contractions of the DPMA

Rhythmic tapping to a moving beat motion kinematics overrules natural gravity

beat induction is the cognitive ability that allows humans to listen to a regular pulse in music and move in synchrony with it. although auditory rhythmic cues induce more consistent synchronization than flashing visual metronomes, this auditory-visual asymmetry can be canceled by visual moving stimuli. here, we investigated whether the naturalness of visual motion or its kinematics could provide a synchronization advantage over flashing metronomes. Subjects were asked to tap in sync with visual metronomes defined by vertically accelerating/decelerating motion, either congruent or not with natural gravity; horizontally accelerating/decelerating motion; or flashing stimuli. we found that motion kinematics was the predominant factor determining rhythm synchronization, as accelerating moving metronomes in any cardinal direction produced more precise and predictive tapping than decelerating or flashing conditions. our results support the notion that accelerating visual metronomes convey a strong sense of beat, as seen in the cueing movements of an orchestra director

Escape Philosophy

The physical body has often been seen as a prison, as something to be escaped by any means necessary: technology, mechanization, drugs and sensory deprivation, alien abduction, Rapture, or even death and extinction. Taking in horror movies from David Cronenberg and UFO encounters, metal bands such as Godflesh, ketamine experiments, AI, and cybernetics, Escape Philosophy is an exploration of the ways that human beings have sought to make this escape, to transcend the limits of the human body, to find a way out. As the physical world continues to crumble at an ever-accelerating rate, and we are faced with a particularly 21st-century kind of dread and dehumanization in the face of climate collapse and a global pandemic, Escape Philosophy asks what this escape from our bodies might look like, and if it is even possible