Ludwig T E, Jeeves M A, Norman W D, DeWitt R
Hope College, Holland, Michigan.
Cortex. 1993 Dec;29(4):691-713. doi: 10.1016/s0010-9452(13)80291-2.
A series of studies have reported that responding is faster when letter pairs to be matched are projected to two hemispheres rather than one. Four experiments described here tested this bilateral field advantage and identified factors that influence its extent. Subjects were shown letter pairs drawn from the ensemble "AaBb", and classified the letter pairs as "Match" if the letters had the same name (regardless of case) and "No Match" if they did not. In the first two experiments the letter pairs were presented unilaterally (both letters in one visual field), bilaterally (one letter in each visual field), or centrally (both letters on the vertical midline, above and below fixation), in order to investigate how the bilateral field advantage is influenced by screen location. The third experiment added a bilateral-diagonal position (to check for artefacts related to horizontal scanning strategies), and the fourth experiment added distractor digits (to equate initial processing demands in the bilateral and unilateral conditions). Results indicate that the bilateral field advantage is a robust phenomenon, although several manipulations reduced its magnitude. Implications of these findings for models of hemispheric collaboration and interhemispheric processing are discussed.
一系列研究报告称，当要匹配的字母对投射到两个半球而不是一个半球时，反应速度会更快。这里描述的四个实验测试了这种双侧视野优势，并确定了影响其程度的因素。向受试者展示从“AaBb”集合中抽取的字母对，如果字母名称相同（不考虑大小写），则将字母对分类为“匹配”，如果不同则分类为“不匹配”。在前两个实验中，字母对以单侧（两个字母都在一个视野中）、双侧（每个视野一个字母）或中央（两个字母都在垂直中线上，在注视点上方和下方）的方式呈现，以研究双侧视野优势如何受到屏幕位置的影响。第三个实验增加了双侧对角线位置（以检查与水平扫描策略相关的假象），第四个实验增加了干扰数字（以使双侧和单侧条件下的初始处理需求相等）。结果表明，双侧视野优势是一种稳健的现象，尽管一些操作降低了其幅度。讨论了这些发现对半球协作和半球间加工模型的意义。
