Hiroaki Shimazaki

Effect of display resolution on physiological and psychological state while viewing video content

We experimentally evaluated the effect of display resolution on physiological and psychological state while viewing video content at 4K and 2K on a 65-inch 4K TV. Four kinds of video content (two types of scenic material and two types of material with movement and action) were used. Each program comprised two minutes of 4K and two minutes of 2K content. The results showed that the scores for “presence,” “impact,” “realism,” “quality” and “precision” when viewing 4K scenic content were significantly higher than those for 2K content. Significant differences were also observed between NIRS, an index of nervous system activity, during viewing tests of 4K content and that for 2K content; and between heart rate, an index of sympathetic nervous system activity, during viewing tests of 4K content and that for 2K content. Our results suggest that viewing material at 4K causes psychological elation, a surge in brain activity and calming of autonomic nerve activity, although the effects varied with type of content.

Influence of display resolution on psychophysiological state while viewing content: A comparison between age groups

In this study, we carried out experiments to investigate the influence of display resolution on psychophysiological state while viewing various types of video content at 4K and 2K on a 65-inch 4K TV as a comparison between age groups. The participants viewed four kinds of TV video content (two types of scenic material and two kinds of material with movement and action). The results showed the psychological evaluation scores for participants in their 20s to be higher than those in their 50s when viewing 4K scenic content. However in both age groups, NIRS, an index of nervous system activity, during viewing tests of 4K scenic content, was significantly higher for 4K scenic content viewing than for 2K scenic content. On the other hand, there was a significant difference observed between NIRS for 4K and for 2K in the 50s participants, although there was no significant difference observed for NIRS between resolutions in the 20s participants. Our results suggest that content viewing at 4K can cause psychological elation and a surge in brain activity, although the effects varied somewhat according to content.