Eye height scaling of absolute size in immersive and nonimmersive displays.

Abstract

Eye-height (EH) scaling of absolute height was investigated in three experiments. In Experiment 1, standing observers viewed cubes in an immersive virtual environment. Observers' center of projection was placed at actual EH and at 0.7 times actual EH. Observers' size judgments revealed that the EH manipulation was 76.8% effective. In Experiment 2, seated observers viewed the same cubes on an interactive desktop display; however, no effect of EH was found in response to the simulated EH manipulation. Experiment 3 tested standing observers in the immersive environment with the field of view reduced to match that of the desktop. Comparable to Experiment 1, the effect of EH was 77%. These results suggest that EH scaling is not generally used when people view an interactive desktop display because the altitude of the center of projection is indeterminate. EH scaling is spontaneously evoked, however, in immersive environments.

Memory for target height is scaled to observer height

“…Additionally, individuals do not use EH to scale object height when they do not perceive themselves to be immersed in the scene. That is, virtually manipulating participants' EHs had no effect on perceived object height when the objects were presented on a computer desktop (Dixon et al, 2000). These data suggest that the visual system's use of EH is flexible and depends on context.…”

“…Participants overestimated object height when their EHs were artificially lowered in a virtual environment, relative to when their EHs were not adjusted (Dixon, Wraga, Proffitt, & Williams, 2000). This study showed that people scale the height of objects to their EH.…”

Gradientes de textura com linhas de perspectiva e horizonte amplificam a superestimação de tamanho relativo em espaços pictóricos

“…Isto confirma a relevância do horizonte em fornecer uma escala de tamanho aos objetos, como sugerido por alguns autores (Dixon et al, 2000;Rogers, 1996), e também revela sua contribuição em estabelecer as relações entre tamanhos e distâncias percebidas visualmente.…”

“…Os indí-cios monoculares de profundidade, por sua vez, apresentam um importante papel na apreensão do espaço tridimensional e são comumente utilizados nos processos de reconstrução da profundidade em fotografias, desenhos e representações pictóricas (Rock, 1985). Devido ao advento da construção de ambientes virtuais por técnicas de computação gráfica para simular espaços tridimensionais, torna-se importante compreender como as dimensões espaciais (tamanho e distância) dos objetos são determinadas nesses ambientes essencialmente pictóricos (Botella et al, 2004;Creem-Regehr, Willemsen, Gooch, & Thompson, 2005;Dixon, Wraga, Proffitt & Willians, 2000;Loomis & Blascovich, 1999; Loomis & Knaap, 2003).…”

Mobile Devices as Adjunctive Pain Management Tools

“…To be effective, we believe that the virtual environment must be subjectively immersive. 15 Studies to date show that VR is effective at lessening distress, pain, and anxiety in burn wound care, chemotherapy, dental procedures, surgical procedures, phantom limb pain, physical therapy procedures, ulcer care, and venipuncture. [16][17][18][19][20][21][22][23] Use of the mobile phone as a new platform for VR therapy has, however, now become an emerging research design (see Table 1).…”