Bradshaw J L, Spataro J A, Harris M, Nettleton N C, Bradshaw J
Department of Psychology, Monash University, Clayton, Victoria, Australia.
Neuropsychologia. 1988;26(2):221-35. doi: 10.1016/0028-3932(88)90076-0.
In Experiment 1 children (Kinder, 4-5 yr; Prep, 5-6 yr; Grade 1, 6-7 yr; Grade 2, 7-8 yr) bisected horizontal lines placed to the left, right or across the midline. The youngest groups displayed symmetrical neglect, erring to the left with the left hand and to the right with the right, the adult pattern of leftwards error not appearing until about Grade 2. However, while Prep, Grade 1 and Grade 2 sinistrals showed bigger between-hand differences than dextrals, this was not, unlike an earlier study, true of the youngest Kinder group, and symmetrical neglect did not appear to be peculiar to young sinistrals. A timed peg-moving task in Experiment II showed that performance did not slow when crossing the midline; nor did young sinistrals perform better with centrifugal abductive movement. These and other findings were incompatible with the idea of callosal immaturity in young sinistrals.
在实验1中，儿童（幼儿园中班，4 - 5岁；幼儿园大班，5 - 6岁；一年级，6 - 7岁；二年级，7 - 8岁）将置于左侧、右侧或跨越中线的水平线进行二等分。最年幼的组表现出对称忽视，左手偏向左侧出错，右手偏向右侧出错，直到二年级左右才出现成人向左出错的模式。然而，虽然幼儿园大班、一年级和二年级的左利手儿童左右手之间的差异比右利手儿童更大，但与早期研究不同的是，最年幼的幼儿园中班组并非如此，而且对称忽视似乎并非年轻左利手儿童所特有。实验II中的一项定时插栓移动任务表明，当越过中线时，表现并没有变慢；年轻左利手儿童在离心外展运动中表现也没有更好。这些以及其他发现与年轻左利手儿童胼胝体不成熟的观点不一致。
