CAS Key Laboratory of Behavioral Science, Center for Brain Science and Learning Difficulties, Institute of Psychology, Chinese Academy of Sciences, Beijing, China.
Department of Psychology, University of Chinese Academy of Sciences, Beijing, China.
Dyslexia. 2022 Nov;28(4):416-430. doi: 10.1002/dys.1723. Epub 2022 Aug 2.
Magnocellular (M) deficit theory indicates that individuals with developmental dyslexia (DD) have low sensitivity to stimuli with high temporal frequencies (HTF) and low spatial frequencies (LSF). However, some studies found that temporal processing and spatial processing were correlated with different reading-related skills. Chinese is a logographic language, and visual skills are particularly important for reading in Chinese. It is necessary to investigate the temporal and spatial processing abilities in the M pathway of Chinese children with DD. Using electrophysiological recordings, the present study examined the mean amplitude and latency of P1 during a grating direction judgment task in 13 children with DD and 13 age-matched normal children. Dyslexic children showed a low amplitude and long latency of P1 in the HTF condition and LSF condition compared with age-matched children. In the HTF condition, the amplitude of P1 correlated with phonological awareness, and the latency of P1 correlated with reading fluency and rapid naming of digits. The amplitude of P1 in the LSF condition correlated with reading accuracy. This result suggested that Chinese children with DD had difficulties in both temporal and spatial processing in the M pathway. However, temporal processing and spatial processing played different roles in Chinese reading.
巨细胞（M）缺陷理论表明，发展性阅读障碍（DD）个体对具有高时间频率（HTF）和低空间频率（LSF）的刺激敏感度较低。然而，一些研究发现，时间处理和空间处理与不同的阅读相关技能相关。中文是一种表意文字，视觉技能对中文阅读尤为重要。有必要研究中文阅读障碍儿童 M 通路的时间和空间处理能力。本研究采用电生理记录技术，在 13 名阅读障碍儿童和 13 名年龄匹配的正常儿童中，考察了在光栅方向判断任务中 P1 的平均幅度和潜伏期。与年龄匹配的儿童相比，阅读障碍儿童在 HTF 条件和 LSF 条件下 P1 的振幅较低，潜伏期较长。在 HTF 条件下，P1 的振幅与语音意识相关，而 P1 的潜伏期与阅读流畅性和数字快速命名相关。LSF 条件下 P1 的振幅与阅读准确性相关。这一结果表明，中文阅读障碍儿童在 M 通路上存在时间和空间处理困难。然而，时间处理和空间处理在中文阅读中发挥着不同的作用。
