Titone D, Wingfield A, Caplan D, Waters G, Prentice K
Department of Psychiatry, Harvard Medical School, USA.
Brain Lang. 2001 Apr;77(1):10-24. doi: 10.1006/brln.2000.2419.
We investigated the hypotheses that impaired discourse processing following right hemisphere damage is mediated by task difficulty and is associated with deficits in discourse encoding. Spoken discourse passages differing in contextual predictability were presented to right hemisphere-damaged (RHD) patients and to non-brain-damaged (NBD) controls for subsequent recall using the Auditory Moving Window paradigm. To manipulate processing difficulty, speech segments were of normal or accelerated speech rates. The recall results showed that RHD adults recalled less than NBD controls overall and failed to recall major idea units better than minor idea units for high predictability passages presented at accelerated speech rates. Both RHD patients and NBD controls failed to recall major idea units better than minor idea units for low predictability passages, regardless of speech rate. The encoding results showed that RHD adults were both slower overall and differentially slower than NBD controls when listening to accelerated passage segments. Taken together, the encoding and recall results are consistent with the view that extracting passage gist under difficult listening conditions is especially vulnerable for patients with right hemisphere strokes.
右半球损伤后话语处理受损是由任务难度介导的，并且与话语编码缺陷有关。使用听觉移动窗口范式，将语境可预测性不同的口语话语段落呈现给右半球损伤（RHD）患者和非脑损伤（NBD）对照，以便随后进行回忆。为了操纵处理难度，语音片段的语速为正常语速或加速语速。回忆结果表明，总体而言，RHD成年人的回忆量少于NBD对照，并且对于以加速语速呈现的高可预测性段落，他们回忆主要观点单元的能力并不比次要观点单元更好。对于低可预测性段落，无论语速如何，RHD患者和NBD对照回忆主要观点单元的能力都不比次要观点单元更好。编码结果表明，在听加速的段落片段时，RHD成年人总体上速度较慢，并且与NBD对照相比，差异更明显。综合来看，编码和回忆结果与以下观点一致：在困难的听力条件下提取段落主旨对于右半球中风患者尤其脆弱。
