Pharmacotherapy and passive exercise induce cortical reorganization independent of the order administered to spinalized rats

2021 ◽  
Author(s):  
Matthew R. Cozon
Keyword(s):  
Cortical Reorganization ◽  
Passive Exercise

scholarly journals Passive Exercise of the Hind Limbs after Complete Thoracic Transection of the Spinal Cord Promotes Cortical Reorganization

PLoS ONE ◽  
2013 ◽  
Vol 8 (1) ◽  
pp. e54350 ◽  
Author(s):  
Alessandro Graziano ◽  
Guglielmo Foffani ◽  
Eric B. Knudsen ◽  
Jed Shumsky ◽  
Karen A. Moxon
Keyword(s):  
Spinal Cord ◽  
Cortical Reorganization ◽  
Passive Exercise ◽  
Hind Limbs

scholarly journals Interactive Effects Between Exercise and Serotonergic Pharmacotherapy on Cortical Reorganization After Spinal Cord Injury

2015 ◽  
Vol 30 (5) ◽  
pp. 479-489 ◽  
Author(s):  
Guglielmo Foffani ◽  
Jed Shumsky ◽  
Eric B. Knudsen ◽  
Patrick D. Ganzer ◽  
Karen A. Moxon
Keyword(s):  
Spinal Cord ◽  
Spinal Cord Injury ◽  
Therapeutic Strategies ◽  
Integrated System ◽  
Cortical Reorganization ◽  
Interactive Effects ◽  
System Level ◽  
Passive Exercise ◽  
Cord Injury

Background. In rat models of spinal cord injury, at least 3 different strategies can be used to promote long-term cortical reorganization: (1) active exercise above the level of the lesion; (2) passive exercise below the level of the lesion; and (3) serotonergic pharmacotherapy. Whether and how these potential therapeutic strategies—and their underlying mechanisms of action—interact remains unknown. Methods. In spinally transected adult rats, we compared the effects of active exercise above the level of the lesion (treadmill), passive exercise below the level of the lesion (bike), serotonergic pharmacotherapy (quipazine), and combinations of the above therapies (bike+quipazine, treadmill+quipazine, bike+treadmill+quipazine) on long-term cortical reorganization (9 weeks after the spinal transection). Cortical reorganization was measured as the percentage of cells recorded in the deafferented hindlimb cortex that responded to tactile stimulation of the contralateral forelimb. Results. Bike and quipazine are “competing” therapies for cortical reorganization, in the sense that quipazine limits the cortical reorganization induced by bike, whereas treadmill and quipazine are “collaborative” therapies, in the sense that the reorganization induced by quipazine combined with treadmill is greater than the reorganization induced by either quipazine or treadmill. Conclusions. These results uncover the interactive effects between active/passive exercise and serotonergic pharmacotherapy on cortical reorganization after spinal cord injury, emphasizing the importance of understanding the effects of therapeutic strategies in spinal cord injury (and in other forms of deafferentation) from an integrated system-level approach.

Adaptive and Maladaptive Neural Plasticity Due to Facial Nerve Palsy

2016 ◽  
Vol 224 (2) ◽  
pp. 102-111 ◽  
Author(s):  
Carsten M. Klingner ◽  
Stefan Brodoehl ◽  
Gerd F. Volk ◽  
Orlando Guntinas-Lichius ◽  
Otto W. Witte
Keyword(s):  
Facial Nerve ◽  
Neural Plasticity ◽  
Cortical Plasticity ◽  
Brain Plasticity ◽  
Motor Nerve ◽  
Predictive Coding ◽  
Theoretical Framework ◽  
Cortical Reorganization ◽  
Nerve Lesion ◽  
Peripheral Facial Palsy

Abstract. This paper reviews adaptive and maladaptive mechanisms of cortical plasticity in patients suffering from peripheral facial palsy. As the peripheral facial nerve is a pure motor nerve, a facial nerve lesion is causing an exclusive deefferentation without deafferentation. We focus on the question of how the investigation of pure deefferentation adds to our current understanding of brain plasticity which derives from studies on learning and studies on brain lesions. The importance of efference and afference as drivers for cortical plasticity is discussed in addition to the crossmodal influence of different competitive sensory inputs. We make the attempt to integrate the experimental findings of the effects of pure deefferentation within the theoretical framework of cortical responses and predictive coding. We show that the available experimental data can be explained within this theoretical framework which also clarifies the necessity for maladaptive plasticity. Finally, we propose rehabilitation approaches for directing cortical reorganization in the appropriate direction and highlight some challenging questions that are yet unexplored in the field.

Cortical reorganization in phantom limb pain changes after regional anesthesia of the amputated limb

1996 ◽  
Author(s):  
P. Montoya ◽  
N. Birbaumer ◽  
W. Lutzenberger ◽  
H. Flor ◽  
W. Grodd ◽  
...  
Keyword(s):  
Regional Anesthesia ◽  
Phantom Limb Pain ◽  
Cortical Reorganization ◽  
Phantom Limb ◽  
Limb Pain

Conceptual disorganization and redistribution of resting state cortical hubs in untreated first episode psychosis: A 7T MRI study

2020 ◽  
Author(s):  
Avyarthana Dey ◽  
Kara Dempster ◽  
Michael Mackinley ◽  
Peter Jeon ◽  
Tushar Das ◽  
...  
Keyword(s):  
Negative Symptoms ◽  
Superior Temporal Gyrus ◽  
Brain Regions ◽  
First Episode Psychosis ◽  
Cortical Reorganization ◽  
First Episode ◽  
Formal Thought Disorder ◽  
Whole Brain ◽  
Episode Psychosis ◽  
Positive And Negative Symptoms

Background:Network level dysconnectivity has been studied in positive and negative symptoms of schizophrenia. Conceptual disorganization (CD) is a symptom subtype which predicts impaired real-world functioning in psychosis. Systematic reviews have reported aberrant connectivity in formal thought disorder, a construct related to CD. However, no studies have investigated whole-brain functional correlates of CD in psychosis. We sought to investigate brain regions explaining the severity of CD in patients with first-episode psychosis (FEPs) compared with healthy controls (HCs).Methods:We computed whole-brain binarized degree centrality maps of 31 FEPs, 25 HCs and characterized the patterns of network connectivity in the two groups. In FEPs, we related these findings to the severity of CD. We also studied the effect of positive and negative symptoms on altered network connectivity.Results:Compared to HCs, reduced hubness of a right superior temporal gyrus (rSTG) cluster was observed in the FEPs. In patients exhibiting high CD, increased hubness of a medial superior parietal (mSPL) cluster was observed, compared to patients exhibiting low CD. These two regions were strongly correlated with CD scores but not with other symptom scores.Discussion:Our observations are congruent with previous findings of reduced but not increased hubness. We observed increased hubness of mSPL suggesting that cortical reorganization occurs to provide alternate routes for information transfer.Conclusion:These findings provide insight into the underlying neural processes mediating the presentation of symptoms in untreated FEP. A longitudinal tracking of the symptom course will be useful to assess the mechanisms underlying these compensatory changes.

Effect of Immobilization without Passive Exercise After Rotator Cuff Repair

2014 ◽  
Vol 96 (6) ◽  
pp. e44 ◽  
Author(s):  
Kyoung Hwan Koh ◽  
Tae Kang Lim ◽  
Min Soo Shon ◽  
Young Eun Park ◽  
Seung Won Lee ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Rotator Cuff Repair ◽  
Passive Exercise ◽  
Cuff Repair

scholarly journals Cortical Reorganization: Reallocated Responses without Rewiring

2021 ◽  
Vol 31 (2) ◽  
pp. R76-R78
Author(s):  
Antony B. Morland ◽  
Holly D.H. Brown ◽  
Heidi A. Baseler
Keyword(s):  
Cortical Reorganization

Low frequency transcranial magnetic stimulation in subacute ischemic stroke: Number of sessions that altered cortical excitability

2020 ◽  
Vol 47 (4) ◽  
pp. 427-434
Author(s):  
Mohammed S. El-Tamawy ◽  
Moshera H. Darwish ◽  
Saly H. Elkholy ◽  
Engy BadrEldin S. Moustafa ◽  
Shimaa T. Abulkassem ◽  
...  
Keyword(s):  
Ischemic Stroke ◽  
Transcranial Magnetic Stimulation ◽  
Physical Therapy ◽  
Upper Limb ◽  
Magnetic Stimulation ◽  
Cortical Excitability ◽  
Low Frequency ◽  
Cortical Reorganization ◽  
Therapy Program ◽  
Physical Therapy Program

BACKGROUND: Cortical reorganization between both cerebral hemispheres plays an important role in regaining the affected upper extremity motor function post-stroke. OBJECTIVES: The purpose of the current study was to investigate the recommended number of contra-lesion low frequency repetitive transcranial magnetic stimulation (LF-rTMS) sessions that could enhance cortical reorganization post-stroke. METHODS: Forty patients with right hemiparetic subacute ischemic stroke with an age range between 50–65 yrs were randomly assigned into two equal groups: control (GA) and study (GB) groups. Both groups were treated with a selected physical therapy program for the upper limb. Sham and real contra-lesion LF-rTMS was conducted for both groups daily for two consecutive weeks. Sequential changes of cortical excitability were calculated by the end of each session. RESULTS: The significant enhancement in the cortical excitability was observed at the fourth session in favor of the study group (GB). Sequential rate of change in cortical excitability was significant for the first eight sessions. From the ninth session onwards, no difference could be detected between groups. CONCLUSION: The pattern of recovery after stroke is extensive and not all factors could be controlled. Application of LF-rTMS in conjugation with a selected physical therapy program for the upper limb from four to eight sessions seems to be efficient.

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