Previous research has suggested that reading Arabic is slower than reading Hebrew or English, even among native Arabic readers. The authors of this article tested the hypothesis that part of the difficulty in reading Arabic is due to the visual complexity of Arabic orthography. The findings support a perceptual load account of the source of processing difficulty in reading Arabic. In the article, the authors first explain some of the complexities of Arabic writing, then describe the methods they used to test their hypothesis, and finally discuss their findings. Please note that you need to either be a subscriber to this journal, or purchase short term access to this article, in order to read it.