Individual Differences in the Programming of Rapid Bimanual Movements: Are Two Modes Better Than One?

International Journal of Exercise Science 9(3): 347-358, 2016. One of the challenges in performing simultaneous bimanual movements is to prevent interference from one limb to the other, thereby maintaining spatial accuracy in both limbs. Prior research has shown that when a longer distance movement is performed with a shorter movement, the shorter movement overshoots its target and the longer movement undershoots its target relative to control conditions where two shorter or two longer movements are made. The current experiment investigated the motor control strategies used by participants when performing simultaneous aiming movements combining both different and same distances. Participants (N = 20) made rapid lever-positioning movements (goal time to reversal was 350 ms) in the sagittal plane to 2 different spatial targets (20° and 60°) or the same targets (either 20° or 60°). Feedback about spatial accuracy was provided immediately after each trial. Constant error (CE) was measured for each distance based on 20 practice trials per condition. The CE from the same- and different-distance conditions were compared with separate one-way ANOVAs with repeated measures. Overshooting was shown of the 20° target and undershooting of the 60° target when the two distances were performed together. However, the movement amplitudes were positively correlated over trials in both the same- and different-distance conditions. A trial-by-trial analysis of the CE scores revealed both compensatory and non-compensatory strategies. The results suggest individual differences in how amplitude parameters are chosen for use with the generalized motor program in the control of bimanual aiming movements

Escape path complexity and its context dependency in Pacific blue-eyes (Pseudomugil signifer)

The escape trajectories animals take following a predatory attack appear to show high degrees of apparent 'randomness' - a property that has been described as 'protean behaviour'. Here we present a method of quantifying the escape trajectories of individual animals using a path complexity approach. When fish (Pseudomugil signifer) were attacked either on their own or in groups, we find that an individual's path rapidly increases in entropy (our measure of complexity) following the attack. For individuals on their own, this entropy remains elevated (indicating a more random path) for a sustained period (10 seconds) after the attack, whilst it falls more quickly for individuals in groups. The entropy of the path is context dependent. When attacks towards single fish come from greater distances, a fish's path shows less complexity compared to attacks that come from short range. This context dependency effect did not exist, however, when individuals were in groups. Nor did the path complexity of individuals in groups depend on a fish's local density of neighbours. We separate out the components of speed and direction changes to determine which of these components contributes to the overall increase in path complexity following an attack. We found that both speed and direction measures contribute similarly to an individual's path's complexity in absolute terms. Our work highlights the adaptive behavioural tactics that animals use to avoid predators and also provides a novel method for quantifying the escape trajectories of animals.Comment: 9 page

The HI Chronicles of LITTLE THINGS BCDs II: The Origin of IC 10's HI Structure

In this paper we analyze Very Large Array (VLA) telescope and Green Bank Telescope (GBT) atomic hydrogen (HI) data for the LITTLE THINGS(1) blue compact dwarf galaxy IC 10. The VLA data allow us to study the detailed HI kinematics and morphology of IC 10 at high resolution while the GBT data allow us to search the surrounding area at high sensitivity for tenuous HI. IC 10's HI appears highly disturbed in both the VLA and GBT HI maps with a kinematically distinct northern HI extension, a kinematically distinct southern plume, and several spurs in the VLA data that do not follow the general kinematics of the main disk. We discuss three possible origins of its HI structure and kinematics in detail: a current interaction with a nearby companion, an advanced merger, and accretion of intergalactic medium. We find that IC 10 is most likely an advanced merger or a galaxy undergoing accretion. 1:Local Irregulars That Trace Luminosity Extremes, The HI Nearby Galaxy Survey; https://science.nrao.edu/science/surveys/littlethingsComment: 36 pages, 17 figures, accepted for publication in The Astronomical Journa

Disability Cause Lawyers

There is a vast and growing cause lawyering literature demonstrating how attorneys and their relationship to social justice movements matter greatly for law’s ability to engender progress. But to date, there has been no examination of the work of ADA disability cause lawyers as cause lawyers. Similarly, despite an extensive literature focused on the ADA’s revolutionary civil rights aspects and the manner in which the Supreme Court’s interpretation of that statute has stymied potential transformation of American society, no academic accounts of disability law have focused on the lawyers who bring these cases. This Article responds to these scholarly voids. We conducted in-depth interviews with many of the nation’s leading disability rights cause lawyers. What we found makes three novel contributions. As the first examination of the activities of these public interest lawyers and their advocacy, it brings to light a neglected sector of an otherwise well-examined field. In doing so, this Article complements, but also complicates, the cause lawyering literature by presenting a vibrant and successful cohort of social movement lawyers who in some ways emulate their peers and in other ways have a unique perspective and mode of operation. The Article also forces a reconsideration of academic critiques of the efficacy and transformative potential of the ADA because it demonstrates how disability cause lawyers have effectively utilized the statute to achieve social integration in the shadow of the Court’s restrictive jurisprudence

Disability Cause Lawyers

There is a vast and growing cause lawyering literature demonstrating how attorneys and their relationship to social justice movements matter greatly for law’s ability to engender progress. But to date, there has been no examination of the work of ADA disability cause lawyers as cause lawyers. Similarly, despite an extensive literature focused on the ADA’s revolutionary civil rights aspects and the manner in which the Supreme Court’s interpretation of that statute has stymied potential transformation of American society, no academic accounts of disability law have focused on the lawyers who bring these cases. This Article responds to these scholarly voids. We conducted in-depth interviews with many of the nation’s leading disability rights cause lawyers. What we found makes three novel contributions. As the first examination of the activities of these public interest lawyers and their advocacy, it brings to light a neglected sector of an otherwise well-examined field. In doing so, this Article complements, but also complicates, the cause lawyering literature by presenting a vibrant and successful cohort of social movement lawyers who in some ways emulate their peers and in other ways have a unique perspective and mode of operation. The Article also forces a reconsideration of academic critiques of the efficacy and transformative potential of the ADA because it demonstrates how disability cause lawyers have effectively utilized the statute to achieve social integration in the shadow of the Court’s restrictive jurisprudence