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The Senses Considered As Perceptual Systems

Section 1 Motor Skill Acquisition in Children: Perspectives and Problems.- A Perspective on Motor Development.- Some Problems in Explaining the Origins of Movement Control.- A Knowledge-Based Approach to Motor Skill Acquisition.- Section 2 Prenatal Onset of Motor Patterns.- Prenatal Motor Development.- The Maturation and Development of Fetal Motor Patterns.- Section 3 Development of Coordination.- Development of Coordinated Movement: Dynamic, Relational and Multileveled Perspectives.- Development of Coordinated Movement: Implications for Early Human Development.- Issues in the Study of Human Motor Skill Development: A Reaction to John Fentress.- Section 4 Perception and Action.- Perception and Representation in the Guidance of Spatially Coordinated Behaviour.- Movement Invariances in Culture Specific Skills.- The Emergence of Manual Skills.- Perception-Action Coupling in the Young Infant.- The Perception-Action Perspective: A Commentary on von Hofsten.- Section 5 The Development of Intersubjectivity.- Development of Intersubjective Motor Control in Infants.- Subjective Comments on the Development of Intersubjectivity.- Section 6 Establishing a Base for Perception and Action.- Establishing a Frame of Reference for Action.- Contribution of Head-Movement to the Accuracy of Directional Aiming and Coincidence-Timing Tasks.- Visuo-Manual Coordination from 6 to 10: Specification, Control and Evaluation of Direction and Amplitude Parameters of Movement.- Section 7 Cognition and Action.- Constraints on the Development of Coordination.- Motor Coordination: Constraints and Cognition a Reaction to K.M. Newell.- Action and Cognition Cognitive and Motor Skills in a Developmental Perspective.- Relating Cognition and Action: Reaction to Mounoud.- Cognition and Action: A Reply to Mounoud.- Section 8 Contribution of the Neurosciences to an Understanding of Motor Development.- Development and Acquisition of Motor Skills: A Challenging Prospect for Neuroscience.- The Contribution of the Neurosciences to Understanding the Development of Reaching.- Section 9 Epilogue.- A Morphological Perspective on the Origin and Evolution of Movement Patterns.

Review of Motor Development in Children: Aspects of Coordination and Control

Deficits in Lower Extremity Strength Following Sports-Related Concussion in Collegiate Football Players: 133 May 28, 10

Following sport-related concussion (SRC), athletes have 2 times increased risk for lower extremity musculoskeletal injury. Perceptual-motor control may be a contributory factor, as motor control deficits have repeatedly been demonstrated in athletes with recent SRC even after clearance for return-to-play. Specifically, deficits in accuracy and actualization of action boundary perception (ABP), or the ability to perceive the limits of available actions to a given athlete, have been demonstrated in collegiate athletes who reported an SRC an average of 264 days prior to testing. The purpose of the present study was to evaluate changes in ABP behavior in more acutely concussed young athletes (Concussed), as well as to further characterize contributing factors to the Perception Action Coupling Task (PACT), a novel test of ABP behavior. Recently concussed (≤21 days prior) 12-18 year old athletes (n=48) and healthy controls (n-24) were recruited to participate in a cross-sectional testing protocol, consisting of the PACT, Immediate Post-concussion Assessment and Cognitive Testing (ImPACT), Vestibular-Ocular Motor Screen (VOMS), Balloon Analog Risk Task (BART), and surveys to measure mental effort for each of the above tests, as well as symptoms of depression, anxiety, impulsivity, and perceived physical development. Concussed was presented the option to return for follow-up testing of all measures after clearance for return-to-play. Concussed demonstrated deficits in ABP accuracy (~5%). Concussed reported significantly higher impulsivity (~9%). At follow-up, Concussed had significantly improved PACT accuracy and response time. Post-hoc analyses revealed an association between higher mental effort for BART and higher anxiety with increased PACT movement time. Conversely, higher impulsivity reduced movement time. Higher effort for VOMS reduced initiation time, whereas higher effort for neurocognition reduced accuracy. This is the second study to demonstrate decreased ABP accuracy in concussed athletes, using the PACT. This study also demonstrated the multifactorial nature of ABP, as mental effort during BART, VOMS, and ImPACT, as well as feelings of anxiety and impulsivity, impacted several components of ABP behavior. ABP accuracy has a relationship with SRC, likely through the constellation of symptoms that result from SRC.

Shawn Eagle

Papers

Action Boundary Perception Accuracy Deficits in Recently Concussed Young Athletes