Pointing at targets by children with congenital and transient blindness |
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Authors: | Florence Gaunet Miriam Ittyerah Yves Rossetti |
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Institution: | (1) LIMSI-CNRS, Bat 508, BP 133, 91403 Orsay, France;(2) Department of Psychology, University of Delhi, Delhi, 110007, India;(3) Espace et Action, UMR-S 534 INSERM, Université Claude Bernard Hospices, Civils de Lyon, 16 avenue doyen Lépine, 69500 Bron, France;(4) Laboratoire Eco-Anthropologie et Ethnobiologie, Muséum National d’Histoire Naturelle, CP 135, 57 rue Cuvier, 75231 Paris Cedex 05, France |
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Abstract: | The study investigated pointing at memorized targets in reachable space in congenitally blind (CB) and blindfolded sighted
(BS) children (6, 8, 10 and 12 years; ten children in each group). The target locations were presented on a sagittal plane
by passive positioning of the left index finger. A go signal for matching the target location with the right index finger
was provided 0 or 4 s after demonstration. An age effect was found only for absolute distance errors and the surface area
of pointing was smaller for the CB children. Results indicate that early visual experience and age are not predictive factors
for pointing in children. The delay was an important factor at all ages and for both groups, indicating distinct spatial representations
such as egocentric and allocentric frames of reference, for immediate and delayed pointing, respectively. Therefore, the CB
like the BS children are able to use both ego- and allocentric frames of reference. |
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