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講題：Cronbach Alpha for fMRI BOLD Responses
講者：劉長萱(中央研究院統計所研究員)
時間：100年12月1日(星期四)15:20-17:30
地點：教育館225會議室

講者簡介：
學歷
匹茲堡大學 教育研究方法學 碩士
匹茲堡大學 統計與心理計量理埨 博士 
經歷
中央研究院統計科學研究所 研究員
中央研究院統計科學研究所 副研究員
美國教育考試服務中心NAEP訪問學者
 
演講摘要：
Recent functional magnetic resonance imaging (fMRI) studies on reliability of blood oxygen level dependent (BOLD) responses have found that cortical activity was intrinsically similar within the same brain region yet heterogeneous among distant regions, when exposing subjects to continuous audiovisual movies or music videos. These studies suggested reliability to be a scientific phenomenon beyond the amplitude of brain activity which was indistinguishable among brain regions in the audiovisual experiments. In this talk, I will describe the theoretical properties of the Cronbach alpha coefficient as being applied to fMRI BOLD responses, including the asymptotic standard error and distribution of the coefficient. I'll show two empirical applications of Cronbach alpha to fMRI data which were collected via the change-detection and working memory tasks. Empirical results suggested several interesting findings beyond those from the standard packages for fMRI data analyses.