The Stereoscopic Anisotropy Develops During Childhood
Villa-Laso, Laura (1)
Read, Jenny CA
Tipo de Ítem:Articulo Revista Indexada
PURPOSE. Human vision has a puzzling stereoscopic anisotropy: horizontal depth corrugations are easier to detect than vertical depth corrugations. To date, little is known about the function or the underlying mechanism responsible for this anisotropy. Here, we aim to find out whether this anisotropy is independent of age. To answer this, we compare detection thresholds for horizontal and vertical depth corrugations as a function of age. METHODS. The depth corrugations were defined solely by the horizontal disparity of random dot patterns. The disparities depicted a horizontal or vertical sinusoidal depth corrugation of spatial frequency 0.1 cyc/deg. Detection thresholds were obtained using Bayesian adaptive staircases from a total of 159 subjects aged from 3 to 73 years. For each participant we computed the anisotropy index, defined as the log10-ratio of the detection threshold for vertical corrugations divided by that for horizontal. RESULTS. Anisotropy index was highly variable between individuals but was positive in 87% of the participants. There was a significant correlation between anisotropy index and log-age (r = 0.21, P = 0.008) mainly driven by a significant difference between children and adults. In 67 children aged 3 to 13 years, the mean anisotropy index was 0.34 +/- 0.38 (mean +/- SD, meaning that vertical thresholds were on average 2.2 times the horizontal ones), compared with 0.59 +/- 0.55 in 84 adults aged 18 to 73 years (vertical 3.9 times horizontal). This was mainly driven by a decline in the sensitivity to vertical corrugations. Children had poorer stereoacuity than adults, but had similar sensitivity to adults for horizontal corrugations and were actually more sensitive than adults to vertical corrugations. CONCLUSIONS. The fact that adults show stronger stereo anisotropy than children raises the possibility that visual experience plays a critical role in developing and strengthening the stereo anisotropy.
Este ítem aparece en la(s) siguiente(s) colección(es)
Mostrando ítems relacionados por Título, autor o materia.
Disadvantageous Decision-Making as a Predictor of Drop-Out among Cocaine-Dependent Individuals in Long-Term Residential Treatment Stevens, Laura; Betanzos-Espinosa, Patricia; Crunelle, Cleo L.; Vergara-Moragues, Esperanza (1); Roeyers, Herbert; Lozano Rojas, Óscar; Geert, Dom; González-Saiz, Francisco; Vanderplasschen, Wouter; Verdejo-García, Antonio; Pérez-García, Miguel (Frontier in Psychiatry, 11/2013)The treatment of cocaine-dependent individuals (CDI) is substantially challenged by high drop-out rates, raising questions regarding contributing factors. Recently, a number of studies have highlighted the potential of ...
Rubio Serrano, Laura (Revista Española de Pedagogía, 30/09/2011)El presente artículo representa una aportación respecto el concepto de cultura moral en los centros educativos, una idea que no es totalmente nueva ni siempre se ha utilizado de la misma manera. Su existencia debe enmarcarse ...
Baltar, Ernesto; Herbert, Zbigniew (Nueva Revista, 07/2014)Reseña del libro "El laberinto junto al mar" de Zbigniew Herbert, por Ernesto Baltar.