Understanding Left-Handedness

Gutwinski, Stefan; Löscher, Anna; Mahler, Lieselotte; Kalbitzer, Jan; Heinz, Andreas; Bermpohl, Felix

doi:10.3238/arztebl.2011.0849

Cited by 42 publications

(49 citation statements)

References 104 publications

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“…Defined the concepts and terms above, and based in the records about motor lateralization [6,7,[32][33][34][35][36]; we agree that is considered acceptable to use the expression ''predominantly-used hemibody" to express handedness (for predominantly-used hand), footedness (for predominantly-used foot) and eyedness (for predominantlyused eye).…”

Section: Establishing Some Definitionsmentioning

confidence: 99%

“…In addition, they reinforced in their discussion that motor functions seems to be more lateralized than sensory, emotional or cognitive functions [7].…”

Section: Introductionmentioning

confidence: 97%

“…Described as a lateralized manifestation of the human brain function by Gutwinski et al [7], they state that the contralateral hemispheric command of the movements presumably would give advantages by avoid functional redundancies so as to make neural process more fast and efficient. In addition, they reinforced in their discussion that motor functions seems to be more lateralized than sensory, emotional or cognitive functions [7].…”

Section: Introductionmentioning

confidence: 99%

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Could be the predominantly-used hemibody related to the weight bearing distribution modified by the chronic hemiparesis after stroke?

2015

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Since the first Broca publications issued from 1970s, lateralized functions in the human brain have urged the researchers to postulate hypothesis based in the right-left asymmetries and, according to some theories, the lateralization of the voluntary motor control could represent a solution to avoid redundant process optimizing space and time. Supported by this idea, the clinicians and researchers tend to concept that the chronic hemiplegic stroke patients learn to use predominantly the non-affected hemibody after stroke in which is more convenient to execute their daily life activities, modifying their natural preference in some cases. Although could seems reasonable conceptualize the non-affected side as the predominantly-used hemibody for motor tasks after stroke (convenience hypothesis), evidences point to exist also hemiplegic patients that developed a predominantly use of the affected side. To float an idea, in terms of weight bearing distribution during upright position, the researchers have found patients overloading the non-affected hemibody, as expected; but also patients overloading the affected hemibody, not presenting necessarily Pusher's syndrome cases. Given the evidences, we could propose a severity-modulated predominance hypothesis which complements the convenience hypothesis. According to our complementary hypothesis, the severity of the motor disability presented in the hemiparesis condition (light, moderate and heavy severity) could determine a predominant use defined by preference (light to moderate severity) or convenience (moderate to heavy severity). In this hypothesis, we postulate ideas from a rehabilitation perspective to be incorporated in treatment programs.

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Section: Establishing Some Definitionsmentioning

confidence: 99%

“…In addition, they reinforced in their discussion that motor functions seems to be more lateralized than sensory, emotional or cognitive functions [7].…”

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Could be the predominantly-used hemibody related to the weight bearing distribution modified by the chronic hemiparesis after stroke?

2015

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“…It has also been demonstrated a leftward asymmetry of the AF in both left-and right-handed subjects [21]. Although evidence of left-handedness dates from ancient times, its neurobiology has not been completely elucidated so far [19]. The issue of laterality of the tracts in relation to the MCD lesions also poses complexity to the statistical analysis and several dilemmas to the interpretation of the results.…”

Section: Discussionmentioning

confidence: 96%

“…Interestingly, the frequency of left-handedness was significantly higher in the patients group (50%) than in the control group (8.3%). In the general population, its prevalence ranges from 5 to 25.9% [19]. It is generally accepted that language function is hemispherically lateralized.…”

Section: Discussionmentioning

confidence: 99%

DTI-based tractography of the arcuate fasciculus in patients with polymicrogyria and language disorders

Andrade

Figueiredo

Valeriano

et al. 2015

European Journal of Radiology

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The evolutionary diagnosis of mental disorder

Troisi

2015

WIRES Cognitive Science

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Medicalization of human behavioral diversity is a recurrent theme in the history of psychiatry, and the problem of defining what is a genuine mental disorder is an unresolved question since the origins of clinical psychopathology. Darwinian psychiatry can formulate a definition of mental disorder that is value free and based on factual criteria. From an evolutionary perspective, genuine mental disorders are maladaptive conditions. The ultimate function of an adaptation is gene propagation via maximization of survival and reproduction. It follows that a distressing and/or disabling psychological or behavioral syndrome is a psychiatric disorder only if it impacts negatively on the individual's inclusive fitness. However, in many cases, an evolutionary definition of disorder cannot be reconciled with current social values. Thus, clinicians adopting the evolutionary approach should conform to the prevailing trend of contemporary medicine and accept that their task is to be healers of the distressed, not watchdogs of biological adaptation. These pragmatic considerations do not minimize the scientific validity of the Darwinian definition of mental disorders. Probably, its major contribution to psychiatric theory is the elimination of the necessity to find a brain lesion or dysfunctional mechanism to validate the distinction between disorders and non-disorders.

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Understanding Left-Handedness

Abstract: The consideration of handedness from the epidemiological, neurobiological, and medical points of view provides insight into cerebral lateralization.

Cited by 42 publications

References 104 publications

Could be the predominantly-used hemibody related to the weight bearing distribution modified by the chronic hemiparesis after stroke?

Could be the predominantly-used hemibody related to the weight bearing distribution modified by the chronic hemiparesis after stroke?

DTI-based tractography of the arcuate fasciculus in patients with polymicrogyria and language disorders

The evolutionary diagnosis of mental disorder

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