Construct validity and reliability of working memory tasks for people with aphasia
Construct validity and reliability of working memory tasks for people with aphasia
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DOI：
10.1080/02687038.2014.895973
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发表时间：
2014-06-03
期刊：
影响因子：
2
通讯作者：
Trubl, Brittany
中科院分区：
文献类型：
--
作者：
DeDe, Gayle;Ricca, Matthew;Trubl, Brittany
背景：虽然有几项研究对失语症患者的工作记忆进行了调查，但关于这一人群中用于测量工作记忆的任务的心理测量特性的信息很少。目的：本研究的目的是：(1)检验几种工作记忆任务的构念效度、内部一致性和重测信度；(2)确定哪些任务适用于不同失语症严重程度的人。方法与步骤：在实验一中，非脑损伤的成年人（n=47）完成了一组为失语症患者设计的工作记忆任务。测试任务包括1-back、2-back、听力跨度、图片跨度和正方形跨度的前向和后向。建构效度是通过将新任务的表现与基于三个已知心理测量特性的已建立的工作记忆任务的综合得分相关联来评估的。10名老年人完成了两次测试，以衡量测试重测的可靠性。内部一致性采用劈半信度估计。在实验二中，失语症患者（n=12）完成了新的工作记忆任务。结果与结果：图片跨度任务表现出可接受的重测信度、内部一致性和结构效度。对照组在1-back上显示天花板效应，失语症患者在听广度上显示地板效应。在失语症患者和年龄匹配的对照组中，正方形跨度任务和n-back都显示出较差的内部一致性。结论：基于前向和后向图像广度的复合评分是一种具有可接受的构念效度、内部一致性和重测信度的言语工作记忆测量方法，适用于非脑损伤成人和失语症患者。
Background: Although several studies have examined working memory in people with aphasia, there is little information about the psychometric properties of tasks used to measure working memory in this population.Aims: The aims of this study were (1) to examine the construct validity, internal consistency, and test-retest reliability of several working memory tasks and (2) to determine which tasks were feasible to use with people with a wide range of aphasia severities.Methods & Procedures: In experiment one, non-brain-damaged adults (n=47) completed a set of working memory tasks that were designed for use with people with aphasia. The tasks included 1-back, 2-back, listening span and forward and backward versions of picture span and square span. Construct validity was assessed by correlating performance on the new tasks with a composite score based on three well-established working memory tasks with known psychometric properties. Ten older adults completed the testing battery twice to measure test-retest reliability. Internal consistency was estimated using split-half reliability. In experiment two, people with aphasia (n=12) completed the new working memory tasks.Outcomes & Results: The picture span tasks demonstrated acceptable test-retest reliability, internal consistency, and construct validity. Controls showed ceiling effects on 1-back and people with aphasia showed floor effects on listening span. Both the square span tasks and n-back showed poor internal consistency for people with aphasia and age-matched controls.Conclusions: A composite score based on the forward and backward versions of picture span provides a measure of verbal working memory with acceptable construct validity, internal consistency and test-retest reliability and can be completed by non-brain-damaged adults and people with aphasia.