Morphologically derived environment effects (MDEEs) are well-known examples where phonotactic patterns in the lexicon mismatch with what is allowed at morphological boundaries – alternations. Analyses of MDEEs usually assume that the alternation is morphologically general, and that the sequences ‘repaired’ across morpheme boundaries are phonotactically well-formed in the lexicon. This paper examines the phonotactic patterns in the lexicon of two languages with MDEEs: Korean palatalisation and Turkish velar deletion. I show that Korean heteromorphemic sequences that undergo palatalisation are underattested in the lexicon. A computational learner learns a markedness constraint that drives palatalisation, suggesting a pattern of exceptional non-undergoing. This contrasts with Turkish, where the relevant constraint motivating velar deletion at the morpheme boundary is unavailable from phonotactic learning, and where the alternation is an example of exceptional triggering. These results indicate that MDEEs are not a unitary phenomenon, highlighting the need to examine these patterns in closer quantitative detail.

中文翻译：

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例外性和衍生的环境影响：韩国和土耳其的比较

形态衍生的环境效应 (MDEE) 是众所周知的例子，其中词典中的语音模式与形态边界允许的模式不匹配 - 交替。对 MDEE 的分析通常假设交替在形态上是普遍的，并且跨词素边界“修复”的序列在词典中的语音结构良好。本文研究了具有 MDEE 的两种语言词典中的语音模式：韩语腭化和土耳其软颚音删除。我表明，经历腭化的韩国异形序列在词典中被低估了。计算学习者学习了一个驱动颚化的标记约束，这表明了一种特殊的非进行模式。这与土耳其语形成鲜明对比，其中，在语素边界处激发软腭删除的相关约束不能从语音学习中获得，并且交替是异常触发的一个例子。这些结果表明 MDEE 不是单一现象，强调需要更详细地检查这些模式。