نتائج البحث - "Motor Imagery"

1

Bimanual coupling effect during a proprioceptive stimulation

المؤلفون: Francesca Garbarini, Marco Bove, Ambra Bisio, Monica Biggio

المصدر: Scientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
Scientific Reports

الوصف: Circle-line drawing paradigm is used to study bimanual coupling. In the standard paradigm, subjects are asked to draw circles with one hand and lines with the other hand; the influence of the concomitant tasks results in two “elliptical” figures. Here we tested whether proprioceptive information evoked by muscle vibration inducing a proprioceptive illusion (PI) of movement at central level, was able to affect the contralateral hand drawing circles or lines. A multisite 80 Hz-muscle vibration paradigm was used to induce the illusion of circle- and line-drawing on the right hand of 15 healthy participants. During muscle vibration, subjects had to draw a congruent or an incongruent figure with the left hand. The ovalization induced by PI was compared with Real and Motor Imagery conditions, which already have proved to induce bimanual coupling. We showed that the ovalization of a perceived circle over a line drawing during PI was comparable to that observed in Real and Motor Imagery condition. This finding indicates that PI can induce bimanual coupling, and proprioceptive information can influence the motor programs of the contralateral hand.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e350db44ed3326fd1aa5cae03275e1ebTest
https://doaj.org/article/7ed01d92a258464aba9aa91a827d16efTest

2

Effect of Neurofeedback Facilitation on Poststroke Gait and Balance Recovery

المؤلفون: Kuni Konaka, Hiroaki Fujimoto, Ichiro Miyai, Yuichi Hiramatsu, Yoshihide Sunada, Hironori Otomune, Noriaki Hattori, Yuta Kajiyama, Hideki Mochizuki, Masahito Mihara, Yoshiyuki Watanabe

المصدر: Neurology. 96:e2587-e2598

مصطلحات موضوعية: Adult, Male, medicine.medical_specialty, 050105 experimental psychology, law.invention, 03 medical and health sciences, 0302 clinical medicine, Physical medicine and rehabilitation, Motor imagery, Double-Blind Method, Randomized controlled trial, law, medicine, Humans, 0501 psychology and cognitive sciences, Gait, Postural Balance, Gait Disorders, Neurologic, Aged, Balance (ability), Spectroscopy, Near-Infrared, Supplementary motor area, Gait Disturbance, business.industry, 05 social sciences, Motor Cortex, Stroke Rehabilitation, Recovery of Function, Middle Aged, Neurofeedback, SMA, medicine.anatomical_structure, Imagination, Female, Neurology (clinical), business, 030217 neurology & neurosurgery

الوصف: ObjectiveTo test the hypothesis that supplementary motor area (SMA) facilitation with functional near-infrared spectroscopy–mediated neurofeedback (fNIRS-NFB) augments poststroke gait and balance recovery, we conducted a 2-center, double-blind, randomized controlled trial involving 54 Japanese patients using the 3-meter Timed Up and Go (TUG) test.MethodsPatients with subcortical stroke-induced mild to moderate gait disturbance more than 12 weeks from onset underwent 6 sessions of SMA neurofeedback facilitation during gait- and balance-related motor imagery using fNIRS-NFB. Participants were randomly allocated to intervention (28 patients) or placebo (sham: 26 patients). In the intervention group, the fNIRS signal contained participants' cortical activation information. The primary outcome was TUG improvement 4 weeks postintervention.ResultsThe intervention group showed greater improvement in the TUG test (12.84 ± 15.07 seconds, 95% confidence interval 7.00–18.68) than the sham group (5.51 ± 7.64 seconds, 95% confidence interval 2.43–8.60; group difference 7.33 seconds, 95% CI 0.83–13.83; p = 0.028), even after adjusting for covariates (group × time interaction; F1.23,61.69 = 4.50, p = 0.030, partial η2 = 0.083). Only the intervention group showed significantly increased imagery-related SMA activation and enhancement of resting-state connectivity between SMA and ventrolateral premotor area. Adverse effects associated with fNIRS-mediated neurofeedback intervention were absent.ConclusionSMA facilitation during motor imagery using fNIRS neurofeedback may augment poststroke gait and balance recovery by modulating the SMA and its related network.Classification of EvidenceThis study provides Class III evidence that for patients with gait disturbance from subcortical stroke, SMA neurofeedback facilitation improves TUG time (UMIN000010723 at UMIN-CTR; umin.ac.jp/english/).

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fb8d7ff361c237302a2ddfc2f2ce3642Test
https://doi.org/10.1212/wnl.0000000000011989Test

3

Hypnosis-induced modulation of corticospinal excitability during motor imagery

المؤلفون: Mirta Fiorio, Paola Cesari, Sara Benedetti, Mehran Emadi Andani, Michele Modenese

المصدر: Scientific Reports, Vol 10, Iss 1, Pp 1-9 (2020)
Scientific Reports

مصطلحات موضوعية: Adult, Male, Hypnosis, medicine.medical_treatment, Movement, Altered state of consciousness, Individuality, lcsh:Medicine, Motor Activity, 050105 experimental psychology, Article, 03 medical and health sciences, Young Adult, 0302 clinical medicine, Motor imagery, Motor system, Task Performance and Analysis, Human behaviour, medicine, Humans, Psychology, 0501 psychology and cognitive sciences, Suggestion, lcsh:Science, Motivation, Multidisciplinary, 05 social sciences, lcsh:R, Motor Cortex, Motor control, medicine.disease, Transcranial Magnetic Stimulation, Transcranial magnetic stimulation, Imagination, Hypnotic susceptibility, Female, lcsh:Q, Primary motor cortex, Neuroscience, 030217 neurology & neurosurgery

الوصف: Hypnosis can be considered an altered state of consciousness in which individuals produce movements under suggestion without apparent voluntary control. Despite its application in contexts implying motor control, evidence for the neurophysiological mechanisms underlying hypnosis is scarce. Inter-individual differences in hypnotic susceptibility suggest that sensorimotor strategies may manifest in a hypnotic state. We tested by means of transcranial magnetic stimulation applied over the primary motor cortex whether motor system activation during a motor imagery task differs in the awake and in the hypnotic state. To capture individual differences, 30 healthy volunteers were classified as high or low hypnotizable (Highs and Lows) according to ad-hoc validated scales measuring hypnotic susceptibility and personality questionnaires. Corticospinal activation during motor imagery in the hypnotic state was greater in the Highs than the Lows. Intrinsic motivation in task performance and level of persuasion modulated corticospinal activation in the Highs. Corticospinal system activation under hypnosis may have practical implications that merit research in areas where hypnosis can be applied to improve motor performance, such as loss of motor abilities and sports.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::31ea9dd529dc6671ac88079e80c5a70aTest
http://link.springer.com/article/10.1038/s41598-020-74020-0Test

4

Sensory threshold neuromuscular electrical stimulation fosters motor imagery performance

المؤلفون: Serafeim Perdikis, José del R. Millán, Tiffany Corbet, Iñaki Iturrate, Michael Pereira

المصدر: NeuroImage. 176:268-276

مصطلحات موضوعية: Adult, Male, Sensory Receptor Cells, Cognitive Neuroscience, Sensory system, Stimulation, EEG imaging, Motor Activity, Electroencephalography, Somatosensory system, 050105 experimental psychology, 03 medical and health sciences, 0302 clinical medicine, Motor imagery, Feedback, Sensory, Sensory threshold, Humans, Medicine, 0501 psychology and cognitive sciences, Cortical Synchronization, Kinesthesis, Brain–computer interface, Motor Neurons, medicine.diagnostic_test, business.industry, 05 social sciences, Sensory electrical stimulation, Kinesthetic imagery, Brain-machine interface, Axons, Electric Stimulation, Neurology, Brain-Computer Interfaces, Sensory Thresholds, Imagination, Female, Sensorimotor Cortex, Motor Imagery, business, Motor learning, Neuroscience, 030217 neurology & neurosurgery

الوصف: Motor imagery (MI) has been largely studied as a way to enhance motor learning and to restore motor functions. Although it is agreed that users should emphasize kinesthetic imagery during MI, recordings of MI brain patterns are not sufficiently reliable for many subjects. It has been suggested that the usage of somatosensory feedback would be more suitable than standardly used visual feedback to enhance MI brain patterns. However, somatosensory feed-back should not interfere with the recorded MI brain pattern. In this study we propose a novel feedback modality to guide subjects during MI based on sensory threshold neuromuscular electrical stimulation (St-NMES). St-NMES depolarizes sensory and motor axons without eliciting any muscular contraction. We hypothesize that St-NMES does not induce detectable ERD brain patterns and fosters MI performance. Twelve novice subjects were included in a cross-over design study. We recorded their EEG, comparing St-NMES with visual feed-back during MI or resting tasks. We found that St-NMES not only induced significantly larger desynchronization over sensorimotor areas (p

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af262a1707f6dbc635c0f8862b496bb9Test
https://doi.org/10.1016/j.neuroimage.2018.04.005Test

5

Accuracy and Vividness in Motor Imagery Ability: Differences between Children and Young Adults

المؤلفون: Priscila Tamplain, Chadwick T. Fuchs, Kevin A. Becker, Erin Austin

المصدر: Developmental Neuropsychology. 45:297-308

الوصف: Motor imagery (MI) refers to the imagination of a motor task without actual movement execution. The purpose of this study was to compare MI accuracy and vividness, and motor proficiency between children (

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b1e06e526ac8d49684aa7cbd3d15ae30Test
https://doi.org/10.1080/87565641.2020.1788034Test

6

Telling right from right: the influence of handedness in the mental rotation of hands

المؤلفون: Elizabeth R. Chrastil, You Cheng, Mary Hegarty

المصدر: Cognitive Research, Vol 5, Iss 1, Pp 1-18 (2020)
Cognitive Research: Principles and Implications

مصطلحات موضوعية: Adult, Male, Rotation, Experimental psychology, Cognitive Neuroscience, Experimental and Cognitive Psychology, lcsh:Consciousness. Cognition, Functional Laterality, 050105 experimental psychology, Mental rotation, Task (project management), 03 medical and health sciences, 0302 clinical medicine, Motor imagery, Mixed handedness, Humans, 0501 psychology and cognitive sciences, Handedness, Visual-proprioceptive integration, Gestures, Proprioception, 05 social sciences, Hand, lcsh:BF309-499, Variation (linguistics), Embodied cognition, Space Perception, Imagination, Original Article, Female, Psychology, World knowledge, Handedness strength, 030217 neurology & neurosurgery, Cognitive psychology

الوصف: Background This study investigated the impact of handedness on a common spatial abilities task, the mental rotation task (MRT). The influence of a right-handed world was contrasted with people’s embodied experience with their own hands by testing both left- and right-handed people on an MRT of right- and left-hand stimuli. An additional consideration is the influence of matching the shape of the hand stimuli with the proprioception of one’s own hands. Two orthogonal hypothesis axes were crossed to yield four competing hypotheses. One axis contrasted (i) embodied experience versus (ii) world knowledge; the other axis contrasted (a) the match between the visual image of a hand on the screen and one’s own hand versus (b) the resemblance of the shape outline information from the hand stimuli with the proprioception of one’s own hands. Results Among people with mixed handedness, right-handers performed more accurately for left-hand stimuli, while left-handers had a trend for higher accuracy for right-hand stimuli. For people with extreme handedness, right-handers outperformed left-handers. Regardless of group, there was no significant variation in performance for left-hand stimuli, with only right-hand stimuli producing significant variation. Conclusions No hypothesis fully aligned with all the data. For left-hand stimuli, the consistent performance across groups does not provide support for embodied experience, while world knowledge might influence all groups similarly. Alternatively, the within-group variation for mixed-handed people supports embodied experience in the hand MRT, likely processed through visual-proprioceptive integration.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e07f634d416e93e32b52ff563157197Test
http://link.springer.com/article/10.1186/s41235-020-00230-9Test

7

Acute stress affects implicit but not explicit motor imagery: A pilot study

المؤلفون: Ursula Debarnot, Aymeric Guillot, Franck Di Rienzo, Camille Faes, Sophie Schlatter, Elodie Saruco, Christian Collet

المصدر: International Journal of Psychophysiology. 152:62-71

الوصف: Motor imagery (MI) is the capacity to mentally perform one or a set of movements without concomitant overt action. MI training has been show to enhance the subsequent motor performance. While the benefits of MI to manage stress have been extensively documented, the reverse impact of stress on MI received far less attention. The present study thus aimed to evaluate whether acute stress might influence MI abilities. Thirty participants were assigned either to a stress or a control group. The Socially Evaluated Cold Pressor Test (SECPT) was used to induce stress, with heart rate, electrodermal activity, salivary cortisol, and self-report perceived levels of stress being monitored during the experiment. Stress induction was followed by both implicit (laterality judgment) and explicit (sequential pointing) MI tasks. Main results showed a deleterious impact of stress on implicit MI, while explicit MI was not altered. These exploratory findings provide a deeper understanding of stress effects on cognition, and practically support that under stressful conditions, as during a sport competition or rehabilitation contexts, explicit MI should be prioritized.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::01e3561a84b9c3d709aa6ce4d305ea27Test
https://doi.org/10.1016/j.ijpsycho.2020.04.011Test

8

Inhibitory mechanisms in motor imagery: disentangling different forms of inhibition using action mode switching

المؤلفون: Victoria K. E. Bart, Martina Rieger, Iring Koch

المصدر: Psychological Research. 85:1418-1438

الوصف: In motor imagery, probably several inhibitory mechanisms prevent actual movements: global inhibition, effector-specific inhibition, and inhibition retrieved during target processing. We investigated factors that may influence those mechanisms. In an action mode switching paradigm, participants imagined and executed movements from home buttons to target buttons. We analysed sequential effects. Activation (due to execution) or inhibition (due to imagination) in the previous trial should affect performance in the subsequent trial, enabling conclusions about inhibitory mechanisms in motor imagery. In Experiment 1, evidence for global and effector-specific inhibition was observed. Evidence for inhibition retrieved during target processing was inconclusive. Data patterns were similar when start and end of the imagined movements were indicated with an effector that was part of the imagined movement (hand) and with a different effector (feet). In Experiment 2, we ruled out that the use of biological stimuli (left/right hands in Experiment 1) to indicate the effector causes sequential effects attributed to effector-specific inhibition, by using uppercase letters (R, L). As in Experiment 1, evidence for effector-specific inhibition was observed. In conclusion, we could reliably disentangle several inhibitory mechanisms in motor imagery.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b3e29be8482dcc31c8cb8211bf94a96Test
https://doi.org/10.1007/s00426-020-01327-yTest

9

Constraints on motor planning across the life span: Physical, cognitive, and motor factors

المؤلفون: Jacqueline Williams, Kate Wilmut, Shan Wang

المصدر: Psychology and Aging. 35:421-433

الوصف: Skilled adult movers plan for a comfortable end position even when this requires an uncomfortable start position (end-state-comfort effect). This ability declines in late adulthood and has been linked to age-related differences in cognitive functioning. Other factors, which may also drive difference in motor planning in later adulthood have not been systematically examined. These include perceptions of comfort and levels of motor imagery ability (one's ability to mentally simulate action/predict the outcome of action). Therefore, this study investigated the constraints on movement planning across the life span, including executive functions, general motor ability, physical constraints to movement and motor imagery ability. One hundred and twenty-two participants aged 20-81 years completed an end-state-comfort task with increasing levels of complexity. Individuals' executive functions, motor control, motor imagery ability, and perceived rotation span were also examined. Age-related decline was shown in planning for sequential movements but not in simple single-step movements. Motor planning demonstrated an age-related difference that was associated with an increasing number of constraints as age increased, and in older adults chronological age influenced the effect of each constraint on motor planning. Age-related difference in motor planning may reflect effective compensatory strategies in response to differing constraints in motor imagery ability, executive functions, perceived rotation span, and general speed and accuracy of movement as we age. (PsycInfo Database Record (c) 2020 APA, all rights reserved).

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::60f12cba56031688466837245d779318Test
https://doi.org/10.1037/pag0000408Test

10

Task-specific interhemispheric hypoconnectivity in writer’s cramp – An EEG study

المؤلفون: Mark Hallett, Nivethida Thirugnanasambandam, Ajay S. Pillai, Jessica Shields, Tyler Zimmerman, Silvina G. Horovitz

المصدر: Clin Neurophysiol

مصطلحات موضوعية: Male, Handwriting, medicine.medical_specialty, genetic structures, Audiology, Electroencephalography, behavioral disciplines and activities, Functional Laterality, Article, 050105 experimental psychology, 03 medical and health sciences, 0302 clinical medicine, Motor imagery, Parietal Lobe, Physiology (medical), Neural Pathways, medicine, Humans, 0501 psychology and cognitive sciences, Abnormal posturing, Set (psychology), Aged, Dystonia, medicine.diagnostic_test, Writer's cramp, 05 social sciences, Motor Cortex, Middle Aged, medicine.disease, Sensory Systems, Alpha Rhythm, Neurology, Dystonic Disorders, Female, Neurology (clinical), Abnormality, Psychology, psychological phenomena and processes, 030217 neurology & neurosurgery

الوصف: Objective Writer’s cramp (WC) is a focal task-specific dystonia characterized by abnormal posturing of the hand muscles during handwriting, but not during other tasks that involve the same set of muscles and objects such as sharpening a pencil. Our objective was to investigate the pathophysiology underlying the task specificity of this disorder using EEG. We hypothesized that premotor-parietal connectivity will be lower in WC patients specifically during handwriting and motor imagery of handwriting. Methods We recruited 15 WC patients and 15 healthy controls. EEG was recorded while participants performed 4 tasks – writing with a pencil, sharpening a pencil, imagining writing and imagining sharpening. We determined the connectivity changes between relevant brain regions during these tasks. Results We found reduced interhemispheric alpha coherence in the sensorimotor areas in WC patients exclusively during handwriting. WC patients also showed less reduction of task-related beta spectral power and a trend for reduced premotor-parietal coherence during motor tasks. Conclusion We could not confirm an abnormality in premotor-parietal connectivity specific to handwriting by this method. However, there was a task-specific reduction in interhemispheric alpha connectivity in WC patients, whose behavioral correlate remains unknown. Significance Interhemispheric alpha connectivity can be a potential interventional target in WC.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2fbb767c71903f30051854ee1c1b82e6Test
https://doi.org/10.1016/j.clinph.2020.01.011Test

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