scholarly journals Slowing of Motor Imagery after a Right Hemispheric Stroke

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Francine Malouin ◽  
Carol L. Richards ◽  
Anne Durand
Keyword(s):  
Working Memory ◽  
Motor Imagery ◽  
Memory Deficits ◽  
Mental Practice ◽  
Visuospatial Working Memory ◽  
Hemispheric Stroke ◽  
Imagery Training ◽  
Mental Chronometry ◽  
Temporal Congruence ◽  
Movement Representation

The temporal congruence between real and imagined movements is not always preserved after stroke. We investigated the dependence of temporal incongruence on the side of the hemispheric lesion and its link with working memory deficits. Thirty-seven persons with a chronic stroke after a right or left hemispheric lesion (RHL : n=19; LHL : n=18) and 32 age-matched healthy persons (CTL) were administered a motor imagery questionnaire, mental chronometry and working memory tests. In contrast to persons in the CTL group and LHL subgroup, persons with a RHL had longer movement times during the imagination than the physical execution of stepping movements on both sides, indicating a reduced ability to predict movement duration (temporal incongruence). While motor imagery vividness was good in both subgroups, the RHL group had greater visuospatial working memory deficits. The bilateral slowing of stepping movements in the RHL group indicates that temporal congruence during motor imagery is impaired after a right hemispheric stroke and is also associated with greater visuospatial working memory deficits. Findings emphasize the need to use mental chronometry to control for movement representation during motor imagery training and may indicate that mental practice through motor imagery will have limitations in patients with a right hemispheric stroke.

scholarly journals Right-sided representational neglect after left brain damage in a case without visuospatial working memory deficits

Cortex ◽  
2013 ◽  
Vol 49 (9) ◽  
pp. 2283-2293 ◽  
Author(s):  
Jean-Philippe van Dijck ◽  
Wim Gevers ◽  
Christophe Lafosse ◽  
Wim Fias
Keyword(s):  
Working Memory ◽  
Brain Damage ◽  
Memory Deficits ◽  
Visuospatial Working Memory ◽  
Left Brain ◽  
Left Brain Damage

scholarly journals Sensorized Assessment of Dynamic Locomotor Imagery in People with Stroke and Healthy Subjects

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4545
Author(s):  
Daniela De Bartolo ◽  
Valeria Belluscio ◽  
Giuseppe Vannozzi ◽  
Giovanni Morone ◽  
Gabriella Antonucci ◽  
...  
Keyword(s):  
Motor Imagery ◽  
Lower Limbs ◽  
Imagery Task ◽  
Experimental Conditions ◽  
Significant Information ◽  
Imagery Training ◽  
Mental Chronometry ◽  
Sinusoidal Waveform ◽  
Reaction Forces ◽  
Measurement Units

Dynamic motor imagery (dMI) is a motor imagery task associated with movements partially mimicking those mentally represented. As well as conventional motor imagery, dMI has been typically assessed by mental chronometry tasks. In this paper, an instrumented approach was proposed for quantifying the correspondence between upper and lower limb oscillatory movements performed on the spot during the dMI of walking vs. during actual walking. Magneto-inertial measurement units were used to measure limb swinging in three different groups: young adults, older adults and stroke patients. Participants were tested in four experimental conditions: (i) simple limb swinging; (ii) limb swinging while imagining to walk (dMI-task); (iii) mental chronometry task, without any movement (pure MI); (iv) actual level walking at comfortable speed. Limb swinging was characterized in terms of the angular velocity, frequency of oscillations and sinusoidal waveform. The dMI was effective at reproducing upper limb oscillations more similar to those occurring during walking for all the three groups, but some exceptions occurred for lower limbs. This finding could be related to the sensory feedback, stretch reflexes and ground reaction forces occurring for lower limbs and not for upper limbs during walking. In conclusion, the instrumented approach through wearable motion devices adds significant information to the current dMI approach, further supporting their applications in neurorehabilitation for monitoring imagery training protocols in patients with stroke.

Verbal working memory in HIV-seropositive drug users

2000 ◽  
Vol 6 (5) ◽  
pp. 548-555 ◽  
Author(s):  
ROXANNA FARINPOUR ◽  
EILEEN M. MARTIN ◽  
MICHAEL SEIDENBERG ◽  
DAVID L. PITRAK ◽  
KENNETH J. PURSELL ◽  
...  
Keyword(s):  
Working Memory ◽  
Drug Users ◽  
Memory Performance ◽  
Verbal Working Memory ◽  
Memory Deficits ◽  
Visuospatial Working Memory ◽  
Domain Specific ◽  
Pointing Task ◽  
Two Measures ◽  
Hiv Seropositive

Recent evidence suggests that HIV-seropositive drug users are impaired on tasks of visuospatial working memory compared with drug users seronegative for HIV. In the current study we evaluated the performance of 30 HIV-seropositive male drug users and 30 risk-matched seronegative controls on two measures of verbal working memory, the Listening Span and the verbal Self Ordered Pointing Task. Impaired working memory performance was significantly more common among HIV-seropositive persons compared to controls, with the highest incidence of deficit among symptomatic participants. These findings indicate that working memory deficits in persons with HIV are not domain-specific and can be demonstrated reliably in drug users. (JINS, 2000, 6, 548–555.)

Visuospatial working memory deficits in adolescent onset schizophrenia

2006 ◽  
Vol 87 (1-3) ◽  
pp. 223-227 ◽  
Author(s):  
A. Vance ◽  
N. Hall ◽  
M.A. Bellgrove ◽  
M. Casey ◽  
F. Karsz ◽  
...  
Keyword(s):  
Working Memory ◽  
Memory Deficits ◽  
Visuospatial Working Memory

Visuospatial working memory deficits in schizophrenia

1993 ◽  
Vol 9 (2-3) ◽  
pp. 179-180
Author(s):  
R.S.E. Keefe ◽  
S.E. Lees ◽  
D. Merhige ◽  
C. Blum ◽  
P.D. Harvey ◽  
...  
Keyword(s):  
Working Memory ◽  
Memory Deficits ◽  
Visuospatial Working Memory

scholarly journals Assessment of verbal and visuospatial working memory in mild cognitive impairment and Alzheimer's dementia

2015 ◽  
Vol 9 (3) ◽  
pp. 301-305 ◽  
Author(s):  
Roy P.C. Kessels ◽  
Anouk Overbeek ◽  
Zita Bouman
Keyword(s):  
Working Memory ◽  
Cognitive Impairment ◽  
Mild Cognitive Impairment ◽  
Digit Span ◽  
Memory Deficits ◽  
Alzheimer’S Dementia ◽  
Visuospatial Working Memory ◽  
Alzheimer's Dementia ◽  
Impaired Performance ◽  
Spatial Span

In addition to episodic memory impairment, working memory may also be compromised in mild cognitive impairment (MCI) or Alzheimer's dementia (AD), but standard verbal and visuospatial span tasks do not always detect impairments. Objective: To examine whether more complex verbal and visuospatial working memory tasks result in more reliable impairment detection. Methods: The Digit Span (forward, backward and sequencing), Spatial Span (forward and backward) and Spatial Addition test from the Wechsler batteries were administered to MCI and AD patients and performance compared to healthy older adult controls. Results: Results showed that both the MCI and AD patients had impaired performance on the Spatial Addition test. Both groups also had impaired performance on all three Digit Span conditions, but no differences were found between forward and backward conditions in any of the groups. The sequencing condition differed from the backward condition only in the AD group. Spatial Span performance was impaired in AD group patients but not in MCI patients. Conclusion: Working memory deficits are evident in MCI and AD even on standard neuropsychological tests. However, available tests may not detect subtle impairments, especially in MCI. Novel paradigms tapping the episodic buffer component of working memory may be useful in the assessment of working memory deficits, but such instruments are not yet available for clinical assessment.

scholarly journals A Study on the Effect of Mental Practice Using Motor Evoked Potential-Based Neurofeedback

2021 ◽  
Vol 15 ◽  
Author(s):  
Daiki Matsuda ◽  
Takefumi Moriuchi ◽  
Yuta Ikio ◽  
Wataru Mitsunaga ◽  
Kengo Fujiwara ◽  
...  
Keyword(s):  
Motor Imagery ◽  
Motor Evoked Potentials ◽  
Motor Evoked Potential ◽  
Mental Practice ◽  
The Real ◽  
Group Feedback ◽  
Imagery Training ◽  
Significant Difference ◽  
First Dorsal Interosseous Muscle ◽  
The Right

This study aimed to investigate whether the effect of mental practice (motor imagery training) can be enhanced by providing neurofeedback based on transcranial magnetic stimulation (TMS)-induced motor evoked potentials (MEP). Twenty-four healthy, right-handed subjects were enrolled in this study. The subjects were randomly allocated into two groups: a group that was given correct TMS feedback (Real-FB group) and a group that was given randomized false TMS feedback (Sham-FB group). The subjects imagined pushing the switch with just timing, when the target circle overlapped a cross at the center of the computer monitor. In the Real-FB group, feedback was provided to the subjects based on the MEP amplitude measured in the trial immediately preceding motor imagery. In contrast, the subjects of the Sham-FB group were provided with a feedback value that was independent of the MEP amplitude. TMS was applied when the target, moving from right to left, overlapped the cross at the center of the screen, and the MEP amplitude was measured. The MEP was recorded in the right first dorsal interosseous muscle. We evaluated the pre-mental practice and post-mental practice motor performance in both groups. As a result, a significant difference was observed in the percentage change of error values between the Real-FB group and the Sham-FB group. Furthermore, the MEP was significantly different between the groups in the 4th and 5th sets. Therefore, it was suggested that TMS-induced MEP-based neurofeedback might enhance the effect of mental practice.

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