目的:这项工作从侧化角度研究了言语记忆功能磁共振成像(fMRI)与语言功能磁共振成像,并评估在功能扫描期间执行单词识别的有效性。
方法:30例诊断为癫痫的患者接受了言语记忆,视觉空间记忆,和语言fMRI。我们用单词编码,单词识别,图像编码,和图像识别记忆任务,和语义描述,阅读理解,和听力理解语言任务。我们使用了三个常见的偏侧化指标:网络空间分布,最大统计值,和侧向指数(LI)。
结果:信号空间分布的横向化导致言语记忆和语言功能磁共振成像任务之间的相似性差。信号最大侧化显示出显著(>.8)但不完美(1)的相似性。单词编码LI仅与听力理解LI显着相关(p=.016)。单词识别LI与表达性语言语义描述LI(p=.024)以及接受性语言阅读和听力理解LI(分别为p=.015和p=.019)显着相关。视觉空间任务的LI和语言任务的LI之间没有相关性。
结论:我们的结果支持语言和言语记忆偏侧化之间的关联,通过LI定量最佳确定,以及在必须进行言语记忆偏侧化的临床环境中引入定量手段进行语言功能磁共振成像解释。
This work investigates verbal memory functional MRI (fMRI) versus language fMRI in terms of lateralization, and assesses the validity of performing word recognition during the functional scan.
Thirty patients with a diagnosis of epilepsy underwent verbal memory, visuospatial memory, and language fMRI. We used word encoding, word recognition, image encoding, and image recognition memory tasks, and semantic description, reading comprehension, and listening comprehension language tasks. We used three common lateralization metrics: network spatial distribution, maximum statistical value, and laterality index (LI).
Lateralization of signal spatial distribution resulted in poor similarity between verbal memory and language fMRI tasks. Signal maximum lateralization showed significant (>.8) but not perfect (1) similarity. Word encoding LI showed significant correlation only with listening comprehension LI (p = .016). Word recognition LI was significantly correlated with expressive language semantic description LI (p = .024) and receptive language reading and listening comprehension LIs (p = .015 and p = .019, respectively). There was no correlation between LIs of the visuospatial tasks and LIs of the language tasks.
Our results support the association between language and verbal memory lateralization, optimally determined by LI quantification, and the introduction of quantitative means for language fMRI interpretation in clinical settings where verbal memory lateralization is imperative.