Asymmetries in intermanual transfer of training and motor overflow in adults with down's syndrome and nonhandicapped children

Edwards, Jacqueline M.; Elliott, Digby

doi:10.1080/01688638908400948

Cited by 29 publications

(11 citation statements)

References 9 publications

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“…The findings of the present study lends credibility to several earlier reports (e.g. Elliot 1985;Elliot et al 1986Elliot et al , 1987Edwards & Elliot 1989;Bishop 1990;Devenny & Silverman 1990;Morris & Romski 1993) which have suggested a relationship between non-right handedness and intellectual deficits. The most important feature of the present study, which extends previous research endeavours, was its restriction to a homogeneous group of subjects with mild and moderate ID of an unknown/idiopathic nature, and without specific deficits in motor control.…”

Section: Discussionsupporting

confidence: 91%

“…Finally, the results Zekulin- Hartley (1978Hartley ( , 1982, Hartley ( , 1982, Elliot (1985), Elliot et al (1986), Edwards & Elliot (1989), Giencke & Lewandowski (1989) and Elliot et al (1990) supported the contention that people with ID exhibit a complete bi-hemispheric reversal in the structural makeup of the brain, or at least, a transposition in verbal specialization to the right cerebral hemisphere (with the function of the left cerebral hemisphere unspecified). A reversed cerebral organization for speech in subjects with ID has also been reported by Anderson & Barry (1975) in a study limited to older children (i.e.…”

Section: Discussionmentioning

confidence: 80%

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Excess of non‐right handedness among individuals with intellectual disability: experimental evidence and possible explanations

Grouios

Sakadami

Poderi

et al. 1999

J intellect Disabil Res

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Seventy-three subjects with mild and moderate intellectual disability (ID) of an unknown/idiopathic nature, who had no record of specific deficits in motor control, and 73 normal controls, matched for chronological age and sex, underwent evaluation of handedness. The results confirmed the previously reported excess of non-right handedness among subjects with ID, and suggested that this finding might be indicative of a deviant cerebral organization or atypical lateralization of cerebral representation of function in this group. However, it was noted that further research is needed to clarify how far this is a function of level of motor skill and how far is a syndrome-specific pathological phenomenon.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 80%

Excess of non‐right handedness among individuals with intellectual disability: experimental evidence and possible explanations

Grouios

Sakadami

Poderi

et al. 1999

J intellect Disabil Res

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“…Because most studies used right-handed subjects, the asymmetry was for greater mirror movement to occur with use of the nondominant hand. However, other studies have reported no difference between the hands (Connolly & Stratton, 1968;Edwards & Elliott, 1989;Herzog & Durwen, 1992;Van Sant & Williams, 1986). Parlow's (1990) study suggests that the pattern of motor overflow occurrence is task dependent, so absence of an intermanual asymmetry of motor overflow in some studies may have resulted from the type of task used.…”

mentioning

confidence: 92%

Handedness and performance variability as factors influencing mirror movement occurrence

Armatas

Summers²,

Bradshaw³

1996

Journal of Clinical and Experimental Neuropsychology

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A finger flexion task was used to investigate the effect of hand preference and performance variability on intensity of mirror movement. Right- and left-handed subjects were asked to maintain target forces, with either their index or small finger, that represented 25, 50, or 75% of their maximum strength capacity for the active finger. Greater mirror movement occurred when the small finger was active, and where there was greater variability in task performance, while mirror movement intensity was less when the dominant hand and the index finger were active. These findings were consistent with the cortical activation explanation of motor overflow (Todor & Lazarus, 1986a), and suggest that task variability is an important factor influencing motor overflow production. It was concluded that, if performance variability reflects the efficiency of cortical activation underlying control of a voluntary task, then refined cortical control decreases the potential for motor overflow to occur. However, it is necessary to clarify the relationship between hand preference, performance variability, and motor overflow, perhaps by examining the neural pathways involved in motor overflow production.

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“…We found that the alternative MVIC test resulted, in general, in large‐amplitude EMGs in healthy subjects that were comparable to or higher than the traditional tests. In healthy individuals performing strenuous tasks, facilitation of activity even in muscles not instructed to be involved in the task has been shown, due to motor irradiation 11, 32. Such an idea has also been used in rehabilitation of weak muscles using proprioceptive neuromuscular facilitation (PNF) 44.…”

Section: Discussionmentioning

confidence: 99%

An alternative test of electromyographic normalization in patients

2005

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The value of electromyography (EMG) in the interpretation of normal and pathological movement depends on recording, processing, and normalization procedures. Traditionally, maximum voluntary isometric contraction (MVIC) of individual muscles is commonly used for EMG normalization. However, this is a time- and energy-consuming procedure, especially in patients. The aim of the present study was to compare an alternative method of recording the MVIC of lower-limb muscles to the traditional method in healthy, young subjects as well as individuals with a stroke. The alternative method consisted of recording the maximum effort of several thigh and leg muscles simultaneously using two tasks on a dynamometer. Five healthy subjects and five individuals who had a stroke performed both MVIC tasks. The healthy group repeated the test 3 h later on the same day. In general, the method of computing maximum EMG from the alternative MVIC test yielded values that were equal or greater than those from the traditional test in both groups. In the healthy group, muscles showed similar EMGs in the two sessions, indicating that the test was reliable. These results suggest that the less time-consuming alternative method of computing maximum EMG values used here provides a reasonable alternative when time and fatigue become issues, especially when testing patient populations.

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Asymmetries in intermanual transfer of training and motor overflow in adults with down's syndrome and nonhandicapped children

Cited by 29 publications

References 9 publications

Excess of non‐right handedness among individuals with intellectual disability: experimental evidence and possible explanations

Excess of non‐right handedness among individuals with intellectual disability: experimental evidence and possible explanations

Handedness and performance variability as factors influencing mirror movement occurrence

An alternative test of electromyographic normalization in patients

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