Spatial asymmetries in the perception of stimulus orientation using the OPTACON

1985 ◽  
Vol 8 (3) ◽  
pp. 347-349 ◽  
Author(s):  
Eugene C. Lechelt
2013 ◽  
Author(s):  
Luca Rinaldi ◽  
Samuel Di Luca ◽  
Avishai Henik ◽  
Luisa Girelli

2008 ◽  
Vol 28 (3) ◽  
pp. 776-786 ◽  
Author(s):  
S. J. Bensmaia ◽  
P. V. Denchev ◽  
J. F. Dammann ◽  
J. C. Craig ◽  
S. S. Hsiao

2020 ◽  
Vol 131 (4) ◽  
pp. e61
Author(s):  
P.Y. Fong ◽  
D. Spampinato ◽  
R. Hannah ◽  
L. Rocchi ◽  
A. Di Santo ◽  
...  

2019 ◽  
Vol 184 (7-8) ◽  
pp. e281-e287
Author(s):  
Caitlin E Mahon ◽  
Benjamin J Darter ◽  
Christopher L Dearth ◽  
Brad D Hendershot

Abstract Introduction Temporal-spatial symmetry allows for optimal metabolic economy in unimpaired human gait. The gait of individuals with unilateral transfemoral amputation is characterized by temporal-spatial asymmetries and greater metabolic energy expenditure. The objective of this study was to determine whether temporal-spatial asymmetries account for greater metabolic energy expenditure in individuals with unilateral transfemoral amputation. Materials and Methods The relationship between temporal-spatial gait asymmetry and metabolic economy (metabolic power normalized by walking speed) was retrospectively examined in eighteen individuals with transfemoral amputation walking at a self-selected velocity overground. Pearson’s product-moment correlations were used to assess the relationship between: (1) step time symmetry and metabolic economy and (2) step length symmetry and metabolic economy. The retrospective analysis of this data was approved by the Walter Reed National Military Medical Center Institutional Review Board and all individuals provided written consent. Additional insights on this relationship are presented through a case series describing the temporal-spatial and metabolic responses of two individuals with transfemoral amputation who completed a split-belt treadmill walking test. Results For the cohort of individuals, there was no significant relationship between metabolic economy and either step time asymmetry or step length asymmetry. However, the case series showed a positive relationship between step length asymmetry and metabolic power as participants adapted to split-belt treadmill walking. Conclusion There is mixed evidence for the relationship between temporal-spatial asymmetries and metabolic energy expenditure. This preliminary study may suggest optimal metabolic energy expenditure in individuals with transfemoral amputation occurs at an individualized level of symmetry and resultant deviations incur a metabolic penalty. The results of this study support the idea that addressing only temporal-spatial gait asymmetries in individuals with transfemoral amputation through rehabilitation may not improve metabolic economy. Nevertheless, future prospective research is necessary to confirm these results and implications for clinical practice.


Resources ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 84
Author(s):  
Antonio A. R. Ioris

The article deals with the meaning and the management of land-based resources by indigenous peoples, which are analyzed through an assessment of the lived spaces of the Guarani–Kaiowa indigenous people in the Brazilian state of Mato Grosso do Sul. The discussion follows an analytical framework that is focused on land, labor and ethnicity. These interconnected politico-economic categories provide the basis for understanding the violence and exploitation perpetrated against indigenous groups, as well as their capacity to reclaim ancestral territories lost to extractivism and agribusiness development. Empirical results indicate that ethnicity is integral to labor and land management processes. In the case of the Guarani–Kaiowa, not only have they become refugees in their own lands due to racist discrimination, but also their labor has been incorporated in the regional economy through interrelated peasantification and proleterianization tendencies. The result is a complex situation that combines major socio-spatial asymmetries with the strategic, exploitative use of land and labor and the growing political contestation by the indigenous groups.


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