Perceived multimedia quality: The impact of device characteristics

This is the post-print version of the Article. The official published version can be accessed from the link below - Copyright @ 2011 Springer VerlagIn the study reported in this paper, the research aims to tackle the question “Do the hardware characteristics of a device affect the viewer’s perceived quality of the media?” Using different hardware devices and media clips that have had different frame rates the viewer’s information assimilation and satisfaction of the media clip was measured. The results suggest that there is a deeper link between the user’s information assimilation than just the hardware that the media is viewed on. On the other hand a user’s satisfaction with clip quality is affected by the alterations in frame rate of the media rather than the device as the satisfaction levels increased regardless of the hardware characteristics

The power of negative feedback from an artificial agent to promote energy saving behavior

\u3cp\u3eIn this paper we analyze the role of negative feedback as provided by artificial agents. We examine the hypothesis that negative feedback offers substantial potential to enhance persuasive interventions aimed to change behavior. This hypothesis is tested based on a review of several studies using the same experimental paradigm that includes a virtual washing machine, in which users have to make choices how to program the washing machine. The studies show how the provision of positive and negative feedback influences these choices under various experimental conditions. Results show that negative feedback can be more effective than positive feedback, also independent of the presence of positive feedback. Negative feedback is in particular effective when the feedback is social instead of factual. Furthermore, the analysis suggests that the effect of negative feedback is enhanced under conditions of task similarity, which stimulate using the feedback for performance improvement. Finally, we show that negative feedback is superior to positive feedback under multiple goals conditions.\u3c/p\u3