The present study explored the morpheme transposition process of two-character Chinese words in the upper and lower visual fields by adopting a dual-target rapid serial visual presentation paradigm. The results showed that the identification accuracy of canonical words was better in the lower visual field, whereas the accuracy of transposed words was almost identical in the upper and lower visual fields. Furthermore, there was no significant difference between canonical and transposed words at 0°, 2°, 4°, and 6° eccentricities in the upper visual field. However, the accuracy of canonical words was markedly higher than that of transposed words at 2°, 4°, and 6° eccentricities in the lower visual field. Finally, the character order errors mainly occurred at 0°eccentricity with a duration of 100 ms in vertical visual fields. These findings, taken together, indicated that the character transposition affected the lexical process of two-character Chinese words in the lower visual field but not in the upper visual field, and the character order of words was more likely to be reversed at 0° eccentricity and the initial stage of visual word processing in vertical reading.

本研究采用双目标快速序列视觉呈现范式，探讨了上下视野中两字汉字的语素转置过程。结果表明，规范词在下视野的识别准确率较好，而在上下视野中转置词的识别准确率几乎相同。此外，在上部视野的 0°、2°、4° 和 6° 偏心率处，规范词和转置词之间没有显着差异。然而，在较低视野中，规范词在2°、4°和6°偏心率下的准确率明显高于转置词。最后，字符顺序错误主要发生在0°偏心处，垂直视野中持续时间为100 ms。这些发现，