Katz R B
Department of Neurology, Boston University School of Medicine.
Cortex. 1991 Mar;27(1):111-9. doi: 10.1016/s0010-9452(13)80274-2.
This study examined a patient who mainly made letter deletion errors in spelling. It was hypothesized that his errors were due primarily to limited ability to retain information in the graphemic buffer, a structure that holds sequences of abstract letter identities for output. Consistent with this hypothesis, the patient's spelling accuracy declined on long words, but the number of letters he wrote per response was not related to word length. Moreover, by having him write words forward and backward, it was shown that his accuracy within a word depended on which part of the word he tried to output first. These results also ruled out alternative accounts of the patient's spelling deficit based on neglect or damage to lexical representations.
本研究对一名在拼写时主要犯字母遗漏错误的患者进行了检查。据推测，他的错误主要是由于在字素缓冲器中保留信息的能力有限，字素缓冲器是一种保存抽象字母序列以供输出的结构。与这一假设一致的是，该患者在拼写长单词时准确率下降，但他每次拼写的字母数量与单词长度无关。此外，通过让他顺向和逆向书写单词，结果表明他在一个单词内的拼写准确率取决于他首先尝试输出单词的哪一部分。这些结果也排除了基于对词汇表征的忽视或损伤对该患者拼写缺陷的其他解释。
