Task difficulty and cognitive deficits in schizophrenia.
Task difficulty and cognitive deficits in schizophrenia.
复制标题
精神分裂症的任务难度和认知缺陷。
DOI：
10.1037//0021-843x.104.2.251
复制
发表时间：
1995
影响因子：
4.6
通讯作者：
Collins,J
中科院分区：
文献类型：
--
作者：
Miller,MB;Chapman,JP;Chapman,LJ;Collins,J
精神分裂症认知的研究者经常通过操纵一个影响正常人和精神分裂症个体准确性的变量来产生2个或更多不同难度水平的任务;研究者发现该变量也影响了两组之间准确性的差异，并得出结论，该变量利用了精神分裂症的差异缺陷。另一种假设是，任务差异的真实分数方差人为地产生的发现。对于自由反应任务，当难度接近50%时，组间差异往往更大。作者阐述了一种新的方法来控制这个工件的选择项目的困难和容易的任务的相对两侧的50%的难度和等距从它使用这种设计与一个字谜任务，他们发现，精神分裂症和正常人的区别没有更多的困难比容易的，他们提出的设计测试假设的精神分裂症缺陷的任务，不同的难度。
Investigators of schizophrenic cognition often produce 2 or more tasks of differing difficulty levels by manipulating a variable that affects the accuracy of both normal and schizophrenic individuals; the investigators find that the variable also affects the difference between the groups in accuracy and conclude that the variable taps a schizophrenic differential deficit. An alternative hypothesis is that task differences in true-score variance artifactually produce the finding. For free-response tasks, group differences tend to be larger when difficulty is near 50%. The authors illustrate a new method of controlling this artifact by selecting items for hard and easy tasks on opposite sides of 50% difficulty and equidistant from it. Using this design with an anagram task, they found that schizophrenic and normal individuals differ no more on hard anagrams than on easy ones, and they propose the design for testing hypotheses concerning schizophrenic deficit on tasks that differ in difficulty.