Course of Development of Global Hyperacuity Over Lifespan

摘要: It is well known that a remarkable amount of visual development occurs during the first few years life (for review, see Gwiazda & Birch, 20011). For instance, there rapid acuity six months life2-6 and stereopsis manifest at an age as early 4 months.7-9 By about 5 age, many basic functions, including acuity,5, 10 stereopsis11 contrast sensitivity,12, 13 reach adult levels. Vernier alignment also develops very rapidly life,14-17 becomes hyperacuity to age.14, 16, 17 However, vernier may not level until teens.18 While we have relatively good knowledge developmental course much less higher-level or global functions. Early efforts understand function focused on organization motion information.19-21 These studies revealed prolonged maturation for perception when compared local perception, suggesting unique vulnerability disorders. Using contour detection task, Kovacs et al. demonstrated long-range spatial integration extended mid-teens.22 Despite these efforts, temporal information throughout infancy childhood, in aging, remains poorly defined. One challenges researchers develop experimental paradigms are suitable infants younger children perform, since most behavioral functions involve complex stimuli tasks. Recently, developed preferential looking protocol study infant sensitivity radial deformation.23 has been humans high deformations circular D4 (4th derivative Gaussian) contours, so called frequency patterns.24 The threshold detecting deformation hyperacuity, it suggested that, achieve optimal performance, mechanism must be involved processing patterns.24-26 We shown this improves year life23 affected by aging with sensitivity.27 We collected data from large number normal subjects, ranging seniors. defined maturational time effects fitting mathematical model data. tested hypothesis similar pattern matures more slowly than function, such resolution acuity, vulnerability. Since plays important role object segmentation, recognition, essential us gain