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Several studies have suggested that both affective valence and arousal affect the perception of time. However, in previous experiments, the two affective dimensions have not been systematically controlled. In this study, standardized photographic slides rated for emotional valence and arousal were projected to two groups of subjects for 2, 4, and 6 sec. One(More)
Thirty undergraduates participated in an experiment investigating the effect of the arithmetic difference between stimulus identity and stimulus numerosity in a numerical version of the Stroop task. It was found that digits symbolically close to the enumeration response reliably produced larger interference than digits that were farther from the enumeration(More)
Writing documents together using collaborative editing tools has become extremely common with the widespread availability of tools such as Google Docs. The design of such tools, rooted in early CSCW research, has historically been focused on providing awareness of the presence and activities of one's collaborators. Evidence from a recent qualitative study,(More)
In a series of three experiments requiring selection of real objects for action, we investigated whether characteristics of the planned action and/or the " affordances " of target and distractor objects affected interference caused by distractors. In all of the experiments, the target object was selected on the basis of colour and was presented alone or(More)
1 When people attend to a target stimulus dimension , manipulations of non-relevant stimulus dimensions affect response latencies and error rates (MacLeod, 1991). For example, when people are asked to name the colour in which words are written , non-relevant colour-words interfere with the naming task (Stroop, 1935). Colour-words incon-gruent with the(More)
It has been proposed that the underlying deficit for some simultanagnosics is the inability to bilaterally orient attention in space due to parietal damage. In five experiments, we examine the performance of a patient with simultanagnosia secondary to bilateral occipito-parietal lesions, IC, in naming pairs of line-drawings. With simultaneous presentation(More)
This paper presents an overview of the User Experience (UX) team at Google. We focus on four aspects of working within Google's product development organization: (1) a bottom-up 'ideas' culture, (2) a data-driven engineering approach, (3) a fast, highly iterative web development cycle, and (4) a global product perspective of designing for multiple(More)
Negative priming is a decrement in performance observed when a previously ignored stimulus is re-presented as a target. The present study examined the relation between selection difficulty and negative priming in five experiments that used hierarchical stimuli (large letters made up by small letters). The results show that negative priming is greater when(More)
—High-density electrical recordings were used to study the time course of processing in tasks that mark the operation of different attention networks. We examined 16 normal subjects and 11 individuals who had suffered traumatic brain injury (TBI) and complained of reduced ability to concentrate. We used three tasks—Continuous Performance Task (CPT), covert(More)
We thank Steven Keele and Michael Posner for the use of the laboratories and for their helpful comments. We are indebted to Amy Hayes and Scott Doran for editing suggestions. We would also like to thank Stan Dehaene, Lana Trick, Raymond Klein, and an anonymous reviewer for their helpful comments and suggestions on earlier drafts of this article Thirty(More)
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