Andrew J Arnold

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Students in two classes in the fall of 2004 making extensive use of online courseware were logged as they visited over 500 different " learning pages " which varied in length and in difficulty. We computed the time spent on each page by each student during each session they were logged in. We then modeled the time spent for a particular visit as a function(More)
Both Williams syndrome (WS) and autism spectrum disorders (ASD) are associated with unusual auditory phenotypes with respect to processing vocal and musical stimuli, which may be shaped by the atypical social profiles that characterize the syndromes. Autonomic nervous system (ANS) reactivity to vocal and musical emotional stimuli was examined in 12 children(More)
Compromised social-perceptual ability has been proposed to contribute to social dysfunction in neurodevelopmental disorders. While such impairments have been identified in Williams syndrome (WS), little is known about emotion processing in auditory and multisensory contexts. Employing a multidimensional approach, individuals with WS and typical development(More)
Williams syndrome (WS) and autism spectrum disorder (ASD) are associated with atypical social-emotional functioning. Affective visual stimuli were used to assess autonomic reactivity and emotion identification, and the social responsiveness scale was used to determine the level social functioning in children with WS and ASD contrasted with typical(More)
Feature induction is used to reduce the complexity of the model search space of a Bayes network. The Bayes net is used to model student behavior in an on-line course. Specifically, the frequency of student self-assessments is used to predict quiz performance. By moving most of the search from the model space to the feature space, prior knowledge and bias(More)
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