scholarly journals Generalization of Visuomotor Learning Between Bilateral and Unilateral Conditions

2009 ◽  
Vol 102 (5) ◽  
pp. 2790-2799 ◽  
Author(s):  
Jinsung Wang ◽  
Robert L. Sainburg
Keyword(s):  
Motor Planning ◽  
Visuomotor Adaptation ◽  
Transformation Process ◽  
Visuomotor Learning ◽  
Visuomotor Transformations ◽  
Neural Processes ◽  
Complete Adaptation ◽  
History Of ◽  
Physiological Research ◽  
Unilateral Conditions

A long history of behavioral and physiological research has suggested that bilateral coordination invokes unique neural processes that are not involved in unilateral movements. This hypothesis predicts that motor learning should show limited transfer between unilateral and bilateral conditions, which is consistent with a recent finding that indicated partial, but not complete, transfer of learning between the two conditions. However, during learning of new motor skills, transformations must also be made between visual and proprioceptive coordinate systems, a process that may occur upstream to the processes that differentiate bilateral from unilateral movements. We now investigate whether visuomotor adaptations are shared between unilateral and bilateral movement conditions. Our results indicate substantial transfer from bilateral to subsequent unilateral conditions for both arms. Interestingly, whereas the nondominant arm never showed complete adaptation to visual rotation under bilateral conditions, this interference, or lack of improvement, in bilateral performance did not disturb the visuomotor adaptation process or transfer, as reflected by superb unilateral performances immediately following the bilateral conditions. These findings unambiguously indicate that visuomotor adaptation can extensively generalize between bilateral and unilateral conditions, thus suggesting a substantial overlap in the neural processes underlying visuomotor transformations between the two movement conditions. Our findings provide support for a two-stage model of motor planning, in which the visuomotor transformation process precedes the processes that convert the visuomotor plan into effector-specific commands that incorporate bilateral synergies and that result in the forces that determine motion.

scholarly journals Visuomotor Learning Generalizes Between Bilateral and Unilateral Conditions Despite Varying Degrees of Bilateral Interference

2010 ◽  
Vol 104 (6) ◽  
pp. 2913-2921 ◽  
Author(s):  
Jinsung Wang ◽  
J. Toby Mordkoff ◽  
Robert L. Sainburg
Keyword(s):  
Arm Movement ◽  
Visuomotor Adaptation ◽  
Sensorimotor Adaptation ◽  
Visuomotor Learning ◽  
Motion Direction ◽  
Visual Rotation ◽  
Hand Motion ◽  
Bimanual Performance ◽  
Affect Transfer ◽  
Unilateral Conditions

Bilateral interference, referring to the tendency of movements of one arm to disrupt the intended movements made simultaneously with the other arm, is often observed in a task that involves differential planning of each arm movement during sensorimotor adaptation. In the present study, we examined two questions: 1) how does the compatibility between visuomotor adaptation tasks performed with both arms affect bilateral interference during bimanual performance? and 2) how do variations in bilateral interference affect transfer of visuomotor adaptation between bilateral and unilateral conditions? To examine these questions, we manipulated visuomotor compatibility using two kinematic variables (direction of required hand motion, direction of an imposed visual rotation). Experiment 1 consisted of two conditions in which the direction of visual rotations for both arms was either in the same or opposing directions, whereas the target direction for both arms was always the same. In experiment 2, we examined the pattern of generalization between the bilateral and unilateral conditions when both the target and rotation directions were opposing between the arms. In both experiments, subjects first adapted to a 30° visual rotation with one arm (preunilateral), then with both arms (bilateral), and finally with the arm that was not used in the first session (postunilateral). Our results show that bilateral interference was smallest when both variables were the same between the arms. Our data also show extensive transfer of visuomotor adaptation between bilateral and unilateral conditions, regardless of degree of bilateral interference.

scholarly journals Residual errors in visuomotor adaptation persist despite extended motor preparation periods

2021 ◽  
Author(s):  
Matthew Weightman ◽  
John-Stuart Brittain ◽  
R.Chris Miall ◽  
Ned Jenkinson
Keyword(s):  
Motor Planning ◽  
Motor Preparation ◽  
Visuomotor Adaptation ◽  
Limiting Factors ◽  
Visuomotor Rotation ◽  
Preparation Time ◽  
Consistent Finding ◽  
Complete Adaptation ◽  
Preparation Period ◽  
Residual Errors

A consistent finding in sensorimotor adaptation is a persistent undershoot of full compensation, such that performance asymptotes with residual errors greater than seen at baseline. This behaviour has been attributed to limiting factors within the implicit adaptation system, which reaches a sub-optimal equilibrium between trial-by-trial learning and forgetting. However, recent research has suggested that allowing longer motor planning periods prior to movement eliminates these residual errors. The additional planning time allows required cognitive processes to be completed before movement onset, thus increasing accuracy. Here we looked to extend these findings by investigating the relationship between increased motor preparation time and the size of imposed visuomotor rotation (30°, 45° or 60°), with regards to the final asymptotic level of adaptation. We found that restricting preparation time to 0.35 seconds impaired adaptation for moderate and larger rotations, resulting in larger residual errors compared to groups with additional preparation time. However, we found that even extended preparation time failed to eliminate persistent errors, regardless of magnitude of cursor rotation. Thus, the asymptote of adaptation was significantly less than the degree of imposed rotation, for all experimental groups. Additionally, there was a positive relationship between asymptotic error and implicit retention. These data suggest that a prolonged motor preparation period is insufficient to reliably achieve complete adaptation and therefore our results provide support for the proposal that the balance between error-based learning and forgetting (i.e., incomplete retention) contributes to asymptotic adaptation levels.

scholarly journals Neurophysiological changes in the visuomotor network after practicing a motor task

2018 ◽  
Vol 120 (1) ◽  
pp. 239-249 ◽  
Author(s):  
James E. Gehringer ◽  
David J. Arpin ◽  
Elizabeth Heinrichs-Graham ◽  
Tony W. Wilson ◽  
Max J. Kurz
Keyword(s):  
Motor Learning ◽  
Motor Planning ◽  
Motor Task ◽  
Force Production ◽  
Oscillatory Activity ◽  
Matching Task ◽  
Force Output ◽  
Motor Action ◽  
Visuomotor Transformations ◽  
Target Matching

Although it is well appreciated that practicing a motor task updates the associated internal model, it is still unknown how the cortical oscillations linked with the motor action change with practice. The present study investigates the short-term changes (e.g., fast motor learning) in the α- and β-event-related desynchronizations (ERD) associated with the production of a motor action. To this end, we used magnetoencephalography to identify changes in the α- and β-ERD in healthy adults after participants practiced a novel isometric ankle plantarflexion target-matching task. After practicing, the participants matched the targets faster and had improved accuracy, faster force production, and a reduced amount of variability in the force output when trying to match the target. Parallel with the behavioral results, the strength of the β-ERD across the motor-planning and execution stages was reduced after practice in the sensorimotor and occipital cortexes. No pre/postpractice changes were found in the α-ERD during motor planning or execution. Together, these outcomes suggest that fast motor learning is associated with a decrease in β-ERD power. The decreased strength likely reflects a more refined motor plan, a reduction in neural resources needed to perform the task, and/or an enhancement of the processes that are involved in the visuomotor transformations that occur before the onset of the motor action. These results may augment the development of neurologically based practice strategies and/or lead to new practice strategies that increase motor learning. NEW & NOTEWORTHY We aimed to determine the effects of practice on the movement-related cortical oscillatory activity. Following practice, we found that the performance of the ankle plantarflexion target-matching task improved and the power of the β-oscillations decreased in the sensorimotor and occipital cortexes. These novel findings capture the β-oscillatory activity changes in the sensorimotor and occipital cortexes that are coupled with behavioral changes to demonstrate the effects of motor learning.

scholarly journals Perceptual modulation of parietal activity during urgent saccadic choices

2019 ◽  
Author(s):  
Joshua A. Seideman ◽  
Emilio Salinas ◽  
Terrence R. Stanford
Keyword(s):  
Time Course ◽  
Single Neuron ◽  
Motor Planning ◽  
Neuron Activity ◽  
Lateral Intraparietal Cortex ◽  
Perceptual Evaluation ◽  
Visuomotor Transformations ◽  
Sensory Evidence ◽  
Definition Of ◽  
Single Neuron Activity

The lateral intraparietal cortex (LIP) contributes to visuomotor transformations for determining where to look next. However, its spatial selectivity can signify attentional priority, motor planning, perceptual discrimination, or other mechanisms. Resolving how this LIP signal influences a perceptually guided choice requires knowing exactly when such signal arises and when the perceptual evaluation informs behavior. To achieve this, we recorded single-neuron activity while monkeys performed an urgent choice task for which the perceptual evaluation’s progress can be tracked millisecond by millisecond. The evoked presaccadic responses were strong, exhibited modest motor preference, and were only weakly modulated by sensory evidence. This modulation was remarkable, though, in that its time course preceded and paralleled that of behavioral performance (choice accuracy), and it closely resembled the statistical definition of confidence. The results indicate that, as the choice process unfolds, LIP dynamically combines attentional, motor, and perceptual signals, the former being much stronger than the latter.

scholarly journals Prolonged response time helps eliminate residual errors in visuomotor adaptation

2021 ◽  
Author(s):  
Lisa Langsdorf ◽  
Jana Maresch ◽  
Mathias Hegele ◽  
Samuel D. McDougle ◽  
Raphael Schween
Keyword(s):  
Cognitive Strategies ◽  
Motor Planning ◽  
Visuomotor Adaptation ◽  
Movement Planning ◽  
Planning Time ◽  
Full Compensation ◽  
Speed Accuracy ◽  
Residual Errors ◽  
Prolonged Response ◽  
Accuracy Tradeoff

AbstractOne persistent curiosity in visuomotor adaptation tasks is that participants often do not reach maximal performance. This incomplete asymptote has been explained as a consequence of obligatory computations within the implicit adaptation system, such as an equilibrium between learning and forgetting. A body of recent work has shown that in standard adaptation tasks, cognitive strategies operate alongside implicit learning. We reasoned that incomplete learning in adaptation tasks may primarily reflect a speed-accuracy tradeoff on time-consuming motor planning. Across three experiments, we find evidence supporting this hypothesis, showing that hastened motor planning may primarily lead to under-compensation. When an obligatory waiting period was administered before movement start, participants were able to fully counteract imposed perturbations (Experiment 1). Inserting the same delay between trials – rather than during movement planning – did not induce full compensation, suggesting that the motor planning interval influences the learning asymptote (Experiment 2). In the last experiment (Experiment 3), we asked participants to continuously report their movement intent. We show that emphasizing explicit re-aiming strategies (and concomitantly increasing planning time) also lead to complete asymptotic learning. Findings from all experiments support the hypothesis that incomplete adaptation is, in part, the result of an intrinsic speed-accuracy tradeoff, perhaps related to cognitive strategies that require parametric attentional reorienting from the visual target to the goal.

scholarly journals Exploring the Ways Cinematography Affects Viewers’ Perceived Empathy towards Onscreen Characters

2016 ◽  
Vol 4 (1) ◽  
pp. 88-105 ◽  
Author(s):  
Elen Lotman
Keyword(s):  
Human Perception ◽  
Professional Practices ◽  
Art Making ◽  
Emotional Empathy ◽  
Pilot Experiment ◽  
Visual Reinforcement ◽  
Neural Processes ◽  
History Of ◽  
The Common ◽  
Theoretical Foundations

Abstract In the history of cinematography there is a noticeable tradition to deliberately highlight the elements that accentuate space and spatiality in the shots. At the same time, there is also a contrary tradition, i.e. the conscious reduction of spatiality with the help of artistic tools in order to evoke a feeling of alienation. In this article I will argue that it is highly likely that the visual reinforcement of depth has become one of a cinematographer’s most frequently used tools, because it plays an important role in the audience’s perceived empathy towards onscreen characters. Since the practices of art-making – e.g. cinematography – represent a way that the empirical experience accumulated in professional practices reflects underlying neural processes, this article will first draw upon evidence from the common tenets of cinematography and reflect on how these correspond to the respective phenomena in human perception and cognition. The second part of the article examines the theory of the para-dramatic and eso-dramatic factors established by Gal Raz and Talma Hendler as it applies to cinematography; thereby suggesting possibilities for broadening the theoretical foundations of the twofold division of the causes for the viewers’ empathetic responses. The article will also introduce the results from a pilot experiment. However, I will not argue that the rendering of cinematographic space and drawing attention to certain areas are superior tools for creating filmic empathy. I will rather point out that they are often used by cinematographers when they want to create an immersive experience, and therefore, there is reason to believe that a connection exists between emotional empathy and the usage of these cinematographic tools.

scholarly journals Prolonged reaction times help to eliminate residual errors in visuomotor adaptation

2019 ◽  
Author(s):  
Lisa Langsdorf ◽  
Jana Maresch ◽  
Mathias Hegele ◽  
Samuel D. McDougle ◽  
Raphael Schween
Keyword(s):  
Cognitive Strategies ◽  
Motor Planning ◽  
Reaction Times ◽  
Visuomotor Adaptation ◽  
Movement Planning ◽  
Planning Time ◽  
Trade Off ◽  
Full Compensation ◽  
Speed Accuracy ◽  
Residual Errors

AbstractOne persistent curiosity in visuomotor adaptation tasks is that participants often do not reach maximal performance. This incomplete asymptote has been explained as a consequence of obligatory computations within the implicit adaptation system, such as an equilibrium between learning and forgetting. A body of recent work has shown that in standard adaptation tasks, cognitive strategies operate alongside implicit learning. We reasoned that incomplete learning in adaptation tasks may primarily reflect a speed-accuracy trade-off on time-consuming motor planning. Across three experiments, we find evidence supporting this hypothesis, showing that hastened motor planning may primarily lead to under-compensation. When an obligatory waiting period was administered before movement start, participants were able to fully counteract imposed perturbations (experiment 1). Inserting the same delay between trials - rather than during movement planning - did not induce full compensation, suggesting that the motor planning interval predicts the learning asymptote (experiment 2). In the last experiment, we asked participants to continuously report their movement intent. We show that emphasizing explicit re-aiming strategies (and concomitantly increasing planning time) also lead to complete asymptotic learning. Findings from all experiments support the hypothesis that incomplete adaptation is, in part, the result of an intrinsic speed-accuracy trade-off, perhaps related to cognitive strategies that require parametric attentional reorienting from the visual target to the goal.

scholarly journals New Towns’ Planning and Construction in the Pre-Urbanization or Post-Urbanization Period: A Case Study of the New Towns’ Development Process of Beijing

2020 ◽  
Vol 12 (9) ◽  
pp. 3721 ◽  
Author(s):  
Xiaoxiao Cai ◽  
Bruno De Meulder ◽  
Yanliu Lin ◽  
Hong Sun
Keyword(s):  
Social Background ◽  
Social Contexts ◽  
Transformation Process ◽  
New Towns ◽  
History Of ◽  
Planning And Construction ◽  
The Impact ◽  
The Relationship ◽  
Transformation Processes

Social background and planning objectives differentiate two kinds of development modes for new towns. One starts in the period of post-urbanization and post-industrialization and is committed to improving living conditions and dispersing urban central areas. The other begins in the stage of pre-urbanization and pre-industrialization with the purpose of promoting the development of urbanization and industrialization. However, academics have not given enough attention to researching the relationship between the different modes and their respective social backgrounds. This paper first proposes these two kinds of development modes and analyses how their different social contexts and institutional backgrounds lead to different planning and construction characteristics. Then, taking Beijing as an example, this paper presents a complete review of the development and transformation history of the planning and construction of China’s new towns with different urbanization levels and in an institutional context. The whole history and transformation process can be considered a demonstration and evolution of the two different development modes. Accordingly, by analyzing the respective characteristics and transformation processes in different periods, this study reveals the impact of social background on the new towns’ development and the problems caused by different development modes.

scholarly journals Corticospinal excitability is enhanced after visuomotor adaptation and depends on learning rather than performance or error

2013 ◽  
Vol 109 (4) ◽  
pp. 1097-1106 ◽  
Author(s):  
Hamid F. Bagce ◽  
Soha Saleh ◽  
Sergei V. Adamovich ◽  
John W. Krakauer ◽  
Eugene Tunik
Keyword(s):  
Magnetic Stimulation ◽  
Motor Evoked Potentials ◽  
Alternative Hypothesis ◽  
Single Pulse ◽  
Visuomotor Adaptation ◽  
High Gain ◽  
Corticospinal Excitability ◽  
Control Task ◽  
Visuomotor Learning ◽  
Hand Muscles

We used adaptation to high and low gains in a virtual reality setup of the hand to test competing hypotheses about the excitability changes that accompany motor learning. Excitability was assayed through changes in amplitude of motor evoked potentials (MEPs) in relevant hand muscles elicited with single-pulse transcranial magnetic stimulation (TMS). One hypothesis is that MEPs will either increase or decrease, directly reflecting the effect of low or high gain on motor output. The alternative hypothesis is that MEP changes are not sign dependent but rather serve as a marker of visuomotor learning, independent of performance or visual-to-motor mismatch (i.e., error). Subjects were required to make flexion movements of a virtual forefinger to visual targets. A gain of 1 meant that the excursions of their real finger and virtual finger matched. A gain of 0.25 (“low gain”) indicated a 75% reduction in visual versus real finger displacement, a gain of 1.75 (“high gain”) the opposite. MEP increases (>40%) were noted in the tonically activated task-relevant agonist muscle for both high- and low-gain perturbations after adaptation reached asymptote with kinematics matched to veridical levels. Conversely, only small changes in excitability occurred in a control task of pseudorandom gains that required adjustments to large errors but in which learning could not accumulate. We conclude that changes in corticospinal excitability are related to learning rather than performance or error.

scholarly journals Dissociated development of speech and limb sensorimotor learning in stuttering: speech auditory-motor learning is impaired in both children and adults who stutter

2020 ◽  
Author(s):  
Kwang S. Kim ◽  
Ayoub Daliri ◽  
John Randall Flanagan ◽  
Ludo Max
Keyword(s):  
Motor Learning ◽  
Neurodevelopmental Disorder ◽  
Visuomotor Adaptation ◽  
Sensorimotor Learning ◽  
Typically Developing ◽  
Older Children ◽  
Visuomotor Learning ◽  
Report Data ◽  
Adults Who Stutter ◽  
Reach Movements

Stuttering is a neurodevelopmental disorder of speech fluency. Various experimental paradigms have demonstrated that affected individuals show limitations in sensorimotor control and learning. However, controversy exists regarding two core aspects of this perspective. First, it has been claimed that sensorimotor learning limitations are detectable only in adults who stutter (after years of coping with the disorder) but not during childhood close to the onset of stuttering. Second, it remains unclear whether stuttering individuals' sensorimotor learning limitations affect only speech movements or also unrelated effector systems involved in nonspeech movements. We report data from separate experiments investigating speech auditory-motor learning (N = 60) and limb visuomotor learning (N = 84) in both children and adults who stutter versus matched nonstuttering individuals. Both children and adults who stutter showed statistically significant limitations in speech auditory-motor adaptation with formant-shifted feedback. This limitation was more profound in children than in adults and in younger children versus older children. Between-group differences in the adaptation of reach movements performed with rotated visual feedback were subtle but statistically significant for adults. In children, even the nonstuttering groups showed limited visuomotor adaptation just like their stuttering peers. We conclude that sensorimotor learning is impaired in individuals who stutter, and that the ability for speech auditory-motor learning -- which was already adult-like in 3-6 year-old typically developing children -- is severely compromised in young children near the onset of stuttering. Thus, motor learning limitations may play an important role in the fundamental mechanisms contributing to the onset of this speech disorder.

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