Dopaminergic drugs alter beta coherence during motor imagery and motor execution in healthy adults

Abstract Background: Motor Imagery (MI) represents the cognitive component of the movement and recruits dopaminergic systems. Objective: To investigate the role of dopaminergic system through the action of methylphenidate and risperidone over beta coherence during execution, action observation and motor imagery. Methods: Electroencephalography (EEG) data were recorded before and after the substance intake. For statistical analysis, a three-way ANOVA was used to identify changes in beta coherence induced by the group, task and the moment variables. Statistical significance was set at p≤0.007. Results: We found a main effect for group for C3/CZ, and a main effect for task for CZ/C4 pairs of electrodes. Furthermore, significant differences were found in the post-drug administration between groups for C3/CZ pair of electrodes, and between task for C4/CZ pair of electrodes. Conclusion: The administration of methylphenidate and risperidone was able to produce electrocortical changes of the cortical central regions, even when featuring antagonistic effects on the dopaminergic pathways. Moreover, the execution task allowed beta-band modulation increase.

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Kinesthetic illusion induced by visual stimulation influences sensorimotor event-related desynchronization in stroke patients with severe upper-limb paralysis: A pilot study

Restorative Neurology and Neuroscience ◽

10.3233/rnn-201030 ◽

2020 ◽

pp. 1-11

Author(s):

Megumi Okawada ◽

Fuminari Kaneko ◽

Keiichiro Shindo ◽

Masaki Yoneta ◽

Katsuya Sakai ◽

...

Keyword(s):

Pilot Study ◽

Motor Imagery ◽

Upper Limb ◽

Visual Stimulation ◽

Chronic Stroke ◽

Beta Band ◽

Event Related Desynchronization ◽

Before And After ◽

Kinesthetic Illusion ◽

Kinesthetic Perception

Background: Repetition of motor imagery improves the motor function of patients with stroke. However, patients who develop severe upper-limb paralysis after chronic stroke often have an impaired ability to induce motor imagery. We have developed a method to passively induce kinesthetic perception using visual stimulation (kinesthetic illusion induced by visual stimulation [KINVIS]). Objective: This pilot study further investigated the effectiveness of KINVIS in improving the induction of kinesthetic motor imagery in patients with severe upper-limb paralysis after stroke. Methods: Twenty participants (11 with right hemiplegia and 9 with left hemiplegia; mean time from onset [±standard deviation], 67.0±57.2 months) with severe upper-limb paralysis who could not extend their paretic fingers were included in this study. The ability to induce motor imagery was evaluated using the event-related desynchronization (ERD) recorded during motor imagery before and after the application of KINVIS for 20 min. The alpha- and beta-band ERDs around the premotor, primary sensorimotor, and posterior parietal cortices of the affected and unaffected hemispheres were evaluated during kinesthetic motor imagery of finger extension and before and after the intervention. Results: Beta-band ERD recorded from the affected hemisphere around the sensorimotor area showed a significant increase after the intervention, while the other ERDs remained unchanged. Conclusions: In patients with chronic stroke who were unable to extend their paretic fingers for a prolonged period of time, the application of KINVIS, which evokes kinesthetic perception, improved their ability to induce motor imagery. Our findings suggest that although KINVIS is a passive intervention, its short-term application can induce changes related to the motor output system.

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Neural Suppression Elicited During Motor Imagery Following the Observation of Biological Motion From Point-Light Walker Stimuli

Frontiers in Human Neuroscience ◽

10.3389/fnhum.2021.788036 ◽

2022 ◽

Vol 15 ◽

Author(s):

Alice Grazia ◽

Michael Wimmer ◽

Gernot R. Müller-Putz ◽

Selina C. Wriessnegger

Keyword(s):

Motor Imagery ◽

Repeated Measures ◽

Biological Motion ◽

Primary Motor Cortex ◽

Action Observation ◽

Statistical Significance ◽

Mental Simulation ◽

Whole Body ◽

Time Frequency ◽

Point Light

Introduction: Advantageous effects of biological motion (BM) detection, a low-perceptual mechanism that allows the rapid recognition and understanding of spatiotemporal characteristics of movement via salient kinematics information, can be amplified when combined with motor imagery (MI), i.e., the mental simulation of motor acts. According to Jeannerod’s neurostimulation theory, asynchronous firing and reduction of mu and beta rhythm oscillations, referred to as suppression over the sensorimotor area, are sensitive to both MI and action observation (AO) of BM. Yet, not many studies investigated the use of BM stimuli using combined AO-MI tasks. In this study, we assessed the neural response in the form of event-related synchronization and desynchronization (ERD/S) patterns following the observation of point-light-walkers and concordant MI, as compared to MI alone.Methods: Twenty right-handed healthy participants accomplished the experimental task by observing BM stimuli and subsequently performing the same movement using kinesthetic MI (walking, cycling, and jumping conditions). We recorded an electroencephalogram (EEG) with 32 channels and performed time-frequency analysis on alpha (8–13 Hz) and beta (18–24 Hz) frequency bands during the MI task. A two-way repeated-measures ANOVA was performed to test statistical significance among conditions and electrodes of interest.Results: The results revealed significant ERD/S patterns in the alpha frequency band between conditions and electrode positions. Post hoc comparisons showed significant differences between condition 1 (walking) and condition 3 (jumping) over the left primary motor cortex. For the beta band, a significantly less difference in ERD patterns (p < 0.01) was detected only between condition 3 (jumping) and condition 4 (reference).Discussion: Our results confirmed that the observation of BM combined with MI elicits a neural suppression, although just in the case of jumping. This is in line with previous findings of AO and MI (AOMI) eliciting a neural suppression for simulated whole-body movements. In the last years, increasing evidence started to support the integration of AOMI training as an adjuvant neurorehabilitation tool in Parkinson’s disease (PD).Conclusion: We concluded that using BM stimuli in AOMI training could be promising, as it promotes attention to kinematic features and imitative motor learning.

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Experience Influences Brain Mechanisms of Watching Dance

Dance Research ◽

10.3366/drs.2011.0024 ◽

2011 ◽

Vol 29 (supplement) ◽

pp. 352-377 ◽

Cited By ~ 6

Author(s):

Seon Hee Jang ◽

Frank E Pollick

Keyword(s):

Motor Imagery ◽

Visual Experience ◽

Primary Motor Cortex ◽

Action Observation ◽

Brain Area ◽

Retrosplenial Cortex ◽

Imagery Task ◽

Temporoparietal Junction ◽

Action Observation Network ◽

Viewing Experience

The study of dance has been helpful to advance our understanding of how human brain networks of action observation are influenced by experience. However previous studies have not examined the effect of extensive visual experience alone: for example, an art critic or dance fan who has a rich experience of watching dance but negligible experience performing dance. To explore the effect of pure visual experience we performed a single experiment using functional Magnetic Resonance Imaging (fMRI) to compare the neural processing of dance actions in 3 groups: a) 14 ballet dancers, b) 10 experienced viewers, c) 12 novices without any extensive dance or viewing experience. Each of the 36 participants viewed short 2-second displays of ballet derived from motion capture of a professional ballerina. These displays represented the ballerina as only points of light at the major joints. We wished to study the action observation network broadly and thus included two different types of display and two different tasks for participants to perform. The two different displays were: a) brief movies of a ballet action and b) frames from the ballet movies with the points of lights connected by lines to show a ballet posture. The two different tasks were: a) passively observe the display and b) imagine performing the action depicted in the display. The two levels of display and task were combined factorially to produce four experimental conditions (observe movie, observe posture, motor imagery of movie, motor imagery of posture). The set of stimuli used in the experiment are available for download after this paper. A random effects ANOVA was performed on brain activity and an effect of experience was obtained in seven different brain areas including: right Temporoparietal Junction (TPJ), left Retrosplenial Cortex (RSC), right Primary Somatosensory Cortex (S1), bilateral Primary Motor Cortex (M1), right Orbitofrontal Cortex (OFC), right Temporal Pole (TP). The patterns of activation were plotted in each of these areas (TPJ, RSC, S1, M1, OFC, TP) to investigate more closely how the effect of experience changed across these areas. For this analysis, novices were treated as baseline and the relative effect of experience examined in the dancer and experienced viewer groups. Interpretation of these results suggests that both visual and motor experience appear equivalent in producing more extensive early processing of dance actions in early stages of representation (TPJ and RSC) and we hypothesise that this could be due to the involvement of autobiographical memory processes. The pattern of results found for dancers in S1 and M1 suggest that their perception of dance actions are enhanced by embodied processes. For example, the S1 results are consistent with claims that this brain area shows mirror properties. The pattern of results found for the experienced viewers in OFC and TP suggests that their perception of dance actions are enhanced by cognitive processes. For example, involving aspects of social cognition and hedonic processing – the experienced viewers find the motor imagery task more pleasant and have richer connections of dance to social memory. While aspects of our interpretation are speculative the core results clearly show common and distinct aspects of how viewing experience and physical experience shape brain responses to watching dance.

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Effects of Motor Imagery and Action Observation Training on Pain Perception in Patients With Chronic Neck Pain

Case Medical Research ◽

10.31525/ct1-nct03905577 ◽

2019 ◽

Author(s):

Keyword(s):

Neck Pain ◽

Motor Imagery ◽

Pain Perception ◽

Action Observation ◽

Chronic Neck Pain ◽

Observation Training

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Effects of Action Observation and Motor Imagery on Orofacial Sensorimotor Variables

Case Medical Research ◽

10.31525/ct1-nct04022174 ◽

2019 ◽

Author(s):

Keyword(s):

Motor Imagery ◽

Action Observation

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EVALUATION OF THE EFECTS OF ELECTRONIC ACUPUNCTURE COMBINED WITH “TAM TY THANG” REMEDY IN THE TREATMENT OF RHEUMATOID ARTHRITIS BY WIND-COLD-DAMP

Journal of Medicine and Pharmacy ◽

10.34071/jmp.2016.6.17 ◽

2017 ◽

pp. 122-127

Author(s):

Thi Luu Nguyen ◽

Thi Tan Nguyen

Keyword(s):

Rheumatoid Arthritis ◽

Side Effects ◽

Prospective Study ◽

Key Words Rheumatoid Arthritis ◽

Good Effect ◽

Good Level ◽

Relieve Pain ◽

Level Of Activity ◽

Before And After ◽

The Moment

Objectives: To assess the effect of electronic acupuncture combined with “Tam ty thang” remedy in the treatment of rheumatoid arthritis by wind-cold-damp. Materials and methods: prospective study, comparing before and after treatment, including 43 patients who were diagnosed with rheumatoid arthritis by wind-cold-damp according to traditional medicine. Results: good level occupied 69,8%, and fair good level occupied 30,2%.The improved motor function accounted for 95.3%, to relieve pain up to 95,3%, reducing inflammation of VSS in 1 hour at the moment No 31,65, N28 17,88. The improvement in the level of activity of the hand reached 48,8% for good level. Conclusions: The method of electronic acupuncture combined with “Tam ty thang” remedy have a good effect in the treatment of rheumatoid arthritis by wind-cold-damp and it didn’t cause significantly side effects in clinic. Key words: rheumatoid arthritis, electronic acupuncture, “Tam ty thang” remedy

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STUDY CLINICAL FEATURE AND RESULT OF TREATMENT PHACOMORPHIC GLAUCOMA

Journal of Medicine and Pharmacy ◽

10.34071/jmp.2015.1.9 ◽

2015 ◽

pp. 71-75

Author(s):

Van Nam Phan ◽

Ba Ken Tran

Keyword(s):

Visual Acuity ◽

Intraocular Pressure ◽

Statistical Significance ◽

Corneal Edema ◽

Clinical Feature ◽

Anterior Chamber Angle ◽

Male Population ◽

Significant Difference ◽

Operative Complications ◽

Before And After

Purpose: Study clinical feature of phacomorphic glaucoma. To evaluate the result of treatment phacomorphic glaucoma. Method: The retrospective, interventional study on 36 cases with phacomorphic glaucoma who underwent treated at Hue Central Hospital from 6/2010 to 6/2011. Standard of research: visual, IOP, before and after surgery, accompanying lesions and post-operative complications. The surgery is considered successful when postoperative IOP less than 21 mmHg. Results: Age 50-59 presented 30.5 percent, ≥ 60 presented 91.7 percent. There was a slight female preponderance (66.7%) compared to the male population (33.3%) which implies a statistically marginally significant difference. However there was no statistical significance difference when compared by the two subgroups. Patient in country presented 61,1% and city presented 38,9%. The duration between the onset of pain and surgery from 0 to < 5 days (77.8%), from 6 to 10 (16.7%) and >10 days presented 5.5%. The preoperative intraocular pressure 35 to 45mmHg (47.2%), 46-55 (30.6%), 56-65 (13.9%) and more than 65 presented 8.3%. The visual acuity preoperation less than 1metre count finger (94.5%), less than 3 metre count finger presented 5.5%. Close anterior chamber angle presented 80.6% and shallow was presented 19.4%. Corneal edema presented 100%, iritis presented 94.4%, dilated pupil larger 5mm presented 83.3%, Synchynea iris and cataract presented 72.2%. ECCE, implantation IOL combined trabeculectomy presented 11.1%, Phaco, implantation IOL combined trabeculectomy presented 69,5%, ECCE implantation IOL presented 5.6%, Phaco, implantation IOL presented 13.8%. Postoperative visual acuity from 1/10 to 5/10 presented 72.2%, no case have VA larger than 5/10. Postoperative 3 months VA 1/10 to 5/10 presented 72.2%, larger VA 5/10 presented 8.3%. Postoperative 3 months intraocular pressure ≤ 21mmHg presented 91.7%, 22 to 24mmHg presented 8.3%, no case have IOP ≥25mmHg. Postoperative edema presented 58.3%, iritis presented 58.3%. Key words: phacomorphic Glaucoma

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Treatment of HIV-associated facial lipoatrophy: impact on infection progression assessed by viral load and CD4 count

Anais Brasileiros de Dermatologia ◽

10.1590/abd1806-4841.2013895 ◽

2013 ◽

Vol 88 (4) ◽

pp. 570-577 ◽

Cited By ~ 5

Author(s):

Flávia Machado Gonçalves Soares ◽

Izelda Maria Carvalho Costa

Keyword(s):

Viral Load ◽

Disease Progression ◽

Statistical Significance ◽

Undetectable Viral Load ◽

Fat Distribution ◽

Cd4 Count ◽

Before And After ◽

Facial Lipoatrophy ◽

A Prospective Study ◽

The Impact

BACKGROUND: HIV/AIDS-Associated Lipodystrophy Syndrome includes changes in body fat distribution, with or without metabolic changes. The loss of fat from the face, called facial lipoatrophy, is one of the most stigmatizing signs of the syndrome.OBJECTIVES:To evaluate the effect of FL treatment using polymethylmethacrylate (PMMA) implants on disease progression, assessed by viral load and CD4 cell count.METHODS: This was a prospective study of 44 patients treated from July 2009 to December 2010. Male and female patients, aged over 18 years, with clinically detectable FL and who had never been treated were included in the study. PMMA implantation was done to fill atrophic areas. Laboratory tests were conducted to measure viral load and CD4 count before and after treatment.RESULTS: Of the 44 patients, 72.72% were male and 27.27% female, mean age of 44.38 years. Before treatment, 82% of patients had undetectable viral load, which increased to 88.6% after treatment, but without statistical significance (p = 0.67). CD4 count before treatment ranged from 209 to 1293, averaging 493.97. After treatment, the average increased to 548.61. The increase in CD4 count after treatment was statistically significant with p = 0.02.CONCLUSION: The treatment of FL with PMMA implants showed a statistically significant increase in CD4 count after treatment, revealing the impact of FL treatment on disease progression. Viral load before and after treatment did not vary significantly.

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