Bouma A
Brain Cogn. 1987 Jul;6(3):295-320. doi: 10.1016/0278-2626(87)90128-x.
In this study the influence of visuospatial and verbal memory loads on the identification of laterally presented letter strings was investigated. In the asymmetry task without concurrent loads, a clear right visual field advantage for letter identification was obtained. Hemisphere-specific effects due to concurrent loads were particularly observed when the difficulty of the load tasks was increased. The effects of visuospatial loads were found to be sex related, suggesting that under heavy load conditions mental rotation selectively overloads the processing capacity of the right hemisphere in males, while in females capacity limitations were observed in both hemispheres. Concurrent visuospatial loads produced more facilitation (or less interference) for letters in the outermost positions of each visual field than for letters in the innermost positions of each visual field. The results of the verbal memory load tasks revealed that an easy verbal load task facilitated performance which was particularly manifest for the right-most letter of both the left visual field and the right visual field. A difficult verbal memory load task interfered with recognition accuracy of letters which was most marked for the center letter in the right visual field. Letter position effects obtained in this study were interpreted in terms of various processing mechanisms influencing the serial position curves.
在本研究中，我们调查了视觉空间和言语记忆负荷对横向呈现字母串识别的影响。在没有并发负荷的不对称任务中，字母识别呈现出明显的右视野优势。当负荷任务难度增加时，尤其观察到了因并发负荷导致的半球特异性效应。发现视觉空间负荷的效应与性别有关，这表明在重负荷条件下，心理旋转选择性地使男性右半球的处理能力过载，而在女性中，两个半球都观察到了能力限制。与每个视野最内侧位置的字母相比，并发的视觉空间负荷对每个视野最外侧位置的字母产生了更多的促进作用（或更少的干扰）。言语记忆负荷任务的结果表明，简单的言语负荷任务促进了表现，这在左视野和右视野最右侧的字母上尤为明显。困难的言语记忆负荷任务干扰了字母的识别准确性，这在右视野中间字母上最为明显。本研究中获得的字母位置效应是根据影响系列位置曲线的各种处理机制来解释的。
