用眼动实验和计算模型研究爱沙尼亚语词汇处理,发现语义在命名中起关键作用。
An experimental and computational study of an Estonian single-person word naming
- 采用眼动追踪结合词汇命名任务,分析五项反应变量。
- 基于语义的计算模型指标能有效预测命名时长和注视总时间。
- 深度学习模型不比线性模型更优,传统频率等指标表现更好。
本研究探讨爱沙尼亚语的词汇加工机制。通过大规模单被试实验,结合词汇命名任务与眼动追踪技术,分析五个反应变量(首次注视持续时间、总注视时间、注视次数、命名潜伏期、口语词持续时间),使用广义加性模型进行建模。核心问题是:基于心理词典计算模型(判别性词典模型,DLM)生成的词汇加工指标是否能预测这些反应变量,并与经典预测因子(词频、邻近词数量、屈折范式大小)相比如何。计算模型分别采用线性与深度映射实现。主要发现:第一,基于DLM的指标对词汇加工具有强预测力;第二,深度学习实现的DLM指标并不一定比线性映射更精确;第三,经典预测因子在多数情况下拟合效果优于DLM指标(除总注视时间外,两者拟合度相当);第四,在命名任务中,词汇变量对首次注视时间和总注视次数无预测作用。由于DLM基于形式到意义的映射,其对总注视时间、命名潜伏期和口语词持续时间的预测力表明,意义在当前命名任务中起主导作用。
原文摘要 · Abstract (English)
This study investigates lexical processing in Estonian. A large-scale single-subject experiment is reported that combines the word naming task with eye-tracking. Five response variables (first fixation duration, total fixation duration, number of fixations, word naming latency, and spoken word duration) are analyzed with the generalized additive model. Of central interest is the question of whether measures for lexical processing generated by a computational model of the mental lexicon (the Discriminative Lexicon Model, DLM) are predictive for these response variables, and how they compare to classical predictors such as word frequency, neighborhood size, and inflectional paradigm size. Computational models were implemented both with linear and deep mappings. Central findings are, first, that DLM-based measures are powerful predictors for lexical processing, second, that DLM-measures using deep learning are not necessarily more precise predictors of lexical processing than DLM-measures using linear mappings, third, that classical predictors tend to provide somewhat more precise fits compared to DLM-based predictors (except for total fixation duration, where the two provide equivalent goodness of fit), and fourth, that in the naming task lexical variables are not predictive for first fixation duration and the total number of fixations. As the DLM works with mappings from form to meaning, the predictivity of DLM-based measures for total fixation duration, naming latencies, and spoken word duration indicates that meaning is heavily involved in the present word naming task.
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