Capitani Erminio, Laiacona Marcella, Capasso Rita, Costanzo Maddalena, Gasperoni Chiara, Rosci Chiara, Allamano Nadia, Lorenzi Lorena, Miceli Gabriele
Health Sciences Department.
Neurological Rehabilitation Division.
Neuropsychology. 2019 Jan;33(1):60-76. doi: 10.1037/neu0000488. Epub 2018 Oct 4.
Two aspects of aphasic picture naming were examined: that is, the extent to which the accuracy of the response to the same stimulus is replicated in a successive examination, and , that is, the extent to which accuracy depends on the characteristics of each stimulus.
Thirty-eight aphasic participants were examined twice. The response pattern was the same across the 2 presentations (response stability) for 36 participants, who were classified into 3 groups according to the prevailing error-type (lexical-semantic, phonological, or a balance between the two error-types): Their item-consistency was quantified with Cohen's kappa. In each case the roles played by lexical frequency, precocity of acquisition and length of the target word, and visual complexity and image agreement of the stimulus picture were examined; the ability to predict response accuracy of a model simultaneously including these 5 variables was quantified by means of the McFadden index. Finally, the relationship between predictability (McFadden index) and consistency (Cohen's kappa) was analyzed.
For 34 of 36 participants, consistency was higher than chance. Consistency was directly correlated to the prevalence of lexical-semantic errors. On regression analysis, the relationship between consistency and predictability was significant.
Response consistency reflects the existence of a clear difficulty gradient within the items of a battery. The significant relationship between consistency and error type suggests that, in principle, lexical-semantic errors might be more predictable than phonological errors based on the characteristics of each stimulus. (PsycINFO Database Record (c) 2019 APA, all rights reserved).
研究失语症患者图片命名的两个方面，即同一刺激的反应准确性在连续检查中被重复的程度，以及准确性依赖于每个刺激特征的程度。
对38名失语症参与者进行了两次检查。36名参与者在两次呈现中的反应模式相同（反应稳定性），根据主要错误类型（词汇语义、语音或两种错误类型之间的平衡）将他们分为3组：用科恩kappa系数对他们的项目一致性进行量化。在每种情况下，研究词汇频率、习得早熟性和目标词长度，以及刺激图片的视觉复杂性和图像一致性所起的作用；通过麦克法登指数对同时包含这5个变量的模型预测反应准确性的能力进行量化。最后，分析可预测性（麦克法登指数）与一致性（科恩kappa系数）之间的关系。
36名参与者中有34名的一致性高于随机水平。一致性与词汇语义错误的发生率直接相关。回归分析显示，一致性与可预测性之间的关系显著。
反应一致性反映了一组项目中存在明显的难度梯度。一致性与错误类型之间的显著关系表明，原则上，基于每个刺激的特征，词汇语义错误可能比语音错误更具可预测性。（《心理学文摘数据库记录》（c）2019美国心理学会，保留所有权利）
