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CorrectionBraz J Med Biol Res 2011; 44(8): 754-761Semi-automatic measurement of visual verticality perception in humans reveals a new category of visual field dependency BJMBR
Kaleff,C.R.; Aschidamini,C.; Baron,J.; Di Leone,C.N.; Canavarro,S.; Vargas,C.D..
Tipo: Info:eu-repo/semantics/other
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011001000013
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Early myelin breakdown following sural nerve crush: a freeze-fracture study BJMBR
Martinez,A.M.B.; Canavarro,S..
In this study we describe the early changes of the myelin sheath following surgical nerve crush. We used the freeze-fracture technique to better evaluate myelin alterations during an early stage of Wallerian degeneration. Rat sural nerves were experimentally crushed and animals were sacrificed by transcardiac perfusion 30 h after surgery. Segments of the nerves were processed for routine transmission electron microscopy and freeze-fracture techniques. Our results show that 30 h after the lesion there was asynchrony in the pattern of Wallerian degeneration, with different nerve fibers exhibiting variable degrees of axon disruption. This was observed by both techniques. Careful examination of several replicas revealed early changes in myelin membranes...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Myelin breakdown; Wallerian degeneration; Freeze-fracture; Crush lesion; Sural nerve.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000001200012
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Semi-automatic measurement of visual verticality perception in humans reveals a new category of visual field dependency BJMBR
Kaleff,C.R.; Aschidamini,C.; Baron,J.; Leone,C.N. de; Canavarro,S.; Vargas,C.D..
Previous assessment of verticality by means of rod and rod and frame tests indicated that human subjects can be more (field dependent) or less (field independent) influenced by a frame placed around a tilted rod. In the present study we propose a new approach to these tests. The judgment of visual verticality (rod test) was evaluated in 50 young subjects (28 males, ranging in age from 20 to 27 years) by randomly projecting a luminous rod tilted between -18 and +18° (negative values indicating left tilts) onto a tangent screen. In the rod and frame test the rod was displayed within a luminous fixed frame tilted at +18 or -18°. Subjects were instructed to verbally indicate the rod’s inclination direction (forced choice). Visual dependency was estimated by...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Rod test; Rod and frame test; Subjective visual vertical; Visual streams; Two-alternative forced-choice task.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2011000800004
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