等级图形加工半球偏侧化的发展

以往的研究显示,大脑对等级视觉信息的加工有半球偏侧化的现象,左半球有加工局部特征的优势,右半球有加工整体的优势。本研究采用2年级、4年级、6年级和成人4个年龄组的被试,对等级复合图形中的靶子做选择判断,通过单侧呈现来考察整体-局部加工的大脑功能偏侧化发展。结果发现反应时发展呈现从局部优先到整体优先的过程,半球偏侧化发展呈现从无偏侧化到左侧呈现较右侧呈现更强的整体优先。发展的转折点可能在4～6年级(约9岁～12岁)之间。

Development of Hierarchical Form Lateralization

Prior studies suggested that there are hemispheric biases for globally and locally directed analysis of hierarchical forms. This present research was aimed at tracing the development of hemispherical biases. Subjects of 4 age groups were asked to make a selective reaction to the target triangle. The RT results showed a developmental tendency from local precedence to global precedence, and the hemispherical bias did not appear until grade 6.