Percepção de padrões concêntricos em crianças de 8 a 13 anos

Santos, Natanael Antônio dos; França, Valtenice de Cássia Rodrigues de Matos; Cruz, Éllen Dias Nicácio da

doi:10.1590/s0103-863x2007000200009

Cited by 1 publication

(2 citation statements)

References 36 publications

(42 reference statements)

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“…However, only a few studies, including the present study, examined the development of CS to non-Cartesian gratings (Santos, França, & Cruz, 2007;Santos et al, 2008). The present results suggest that early malnutrition, known to affect primary visual cortical areas (Santos & Alencar, 2010), may affect higher visual cortical areas as well, including V2, V4, and the inferotemporal cortex.…”

Section: Discussionmentioning

confidence: 47%

“…Several studies investigated the normal (Bradley & Freeman, 1982; Adams & Courage, 2002; Benedek, Benedek, Kéri, & Janáky, 2003) and abnormal (amblyopia: Montés-Micó & Ferrer-Blasco, 2001; Down syndrome: Courage, Adams, & Hall, 1997) childhood development of CS to Cartesian stimuli. However, only a few studies, including the present study, examined the development of CS to non-Cartesian gratings (Santos, França, & Cruz, 2007; Santos et al, 2008). The present results suggest that early malnutrition, known to affect primary visual cortical areas (Santos & Alencar, 2010), may affect higher visual cortical areas as well, including V2, V4, and the inferotemporal cortex.…”

Section: Discussionmentioning

confidence: 86%

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Early malnutrition decreases contrast sensitivity to circular concentric gratings.

Alencar¹,

Santos²

2012

Psychology & Neuroscience

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Early malnutrition refers to inadequate nutrition during the critical period of nervous system development followed by nutritional recovery, resulting in a short stature according to age but normal weight according to short stature. We measured the effects of early malnutrition on contrast sensitivity (CS) to concentric circular gratings in 18 children of both sexes, aged 8 to 11 years (mean = 9.2 years, standard deviation = .99 years). Nine of the children were eutrophic (E group), and nine experienced early malnutrition (EM group) based on state healthcare records and Waterlow's anthropometric parameters. Contrast sensitivity to four spatial frequencies (.25, 1.0, 2.0, and 8.0 cycles per degree [cpd]) was measured using a temporal two-alternative forced-choice psychophysical method with mean luminance of 40.1 cd/m 2 . Statistical analyses showed significant differences between groups and a group × frequency interaction. EM group was significantly less sensitive than the E group to the 8.0 cpd frequency and needed 1.49-times more contrast to detect the gratings. These results suggest that early malnutrition impairs CS to high-spatialfrequency concentric circular gratings in children. Therefore, early malnutrition, which is known to affect primary visual cortical areas, may also affect higher visual cortical areas such as V4 and the inferotemporal cortex.

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Section: Discussionmentioning

confidence: 47%