Previous research suggests differences in speech patterns between speakers with foreign accent syndrome (FAS) associated with a neurological (neurogenic FAS) versus a psychological aetiology (functional FAS). Differentiating sub-types holds important clinical implications, affecting the nature of follow-up assessment and treatment. To date, there exist no systematic comparisons between these sub-groups. To investigate possible differences, we employed auditory and acoustic analyses to compare schwa insertion and /r/production in speakers with FAS (12 neurogenic, 5 functional).

Schwa insertion and /r/ production demonstrated significant differences between groups. Neurogenic aetiology was associated with higher within and between speaker performance consistency and congruence of derailments with phonetic-phonological and neurological accounts of ‘error’ origin. Individuals with functional FAS showed significant within and between speaker variability, which was poorly accounted for by linguistic and speech motor control explanations.

We argue that schwa insertion and differences in /r/ realisations provide reliable and accessible variables for clinicians to employ to support differential diagnosis of functional versus neurogenic speech disorders. Findings are discussed in the context of understanding FAS and the broader context of understanding functional speech and language disorders.

先前的研究表明，与神经病因（神经病学FAS）和心理病因病（功能性FAS）相关的外国口音综合症（FAS）的演讲者之间的语音模式有所不同。区分亚型具有重要的临床意义，影响后续评估和治疗的性质。迄今为止，这些子组之间还没有系统的比较。为了研究可能的差异，我们采用听觉和声学分析比较了具有FAS（12种神经源性，5种功能性）的扬声器的schwa插入和/ r /产生。

Schwa的插入和/ r /的生产在组之间显示出显着差异。神经源性病因与说​​话者表现的一致性和出轨的一致性以及出轨的一致性以及“错误”起源的语音，语音和神经学原因相关。具有功能性FAS的人在说话人内部和之间表现出明显的变异性，这在语言和语音运动控制解释中很难得到解释。

我们认为schwa插入和/ r /实现中的差异为临床医生提供了可靠且可访问的变量，以支持功能性和神经源性语言障碍的鉴别诊断。在了解FAS的背景下以及在理解功能性语音和语言障碍的更广泛背景下讨论了发现。