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Abstract
Illusory self-motion (vection) can be generated by visual stimulation. The purpose of the present study was to compare behavioral vection measures including intensity ratings, duration, and onset time across different visual display types. Participants were exposed to a pattern of alternating black-and-white horizontal or vertical bars that moved either in vertical or horizontal direction, respectively. Stimuli were presented on four types of displays in randomized order: (a) large field of view dome projection, (b) combination of three computer screens, (c) single computer screen, (d) large field of view flat projection screen. A Computer Rod and Frame Test was used to measure field dependence, a cognitive style indicating the person’s tendency to rely on external cues (i.e., field dependent) or internal cues (i.e., field independent) with respect to the perception of one’s body position in space. Results revealed that all four displays successfully generated at least moderately strong vection. However, shortest vection onset, longest vection duration, and strongest vection intensity showed for the dome projection and the combination of three screens. This effect was further pronounced in field independent participants, indicating that field dependence can alter vection.
Highlights
Vection typically describes the sensation of illusory self-motion in the absence of physical movement (Brandt, Dichgans, & Koenig, 1973; Fischer & Kornmueller, 1930; Hettinger, Schmidt, Jones, & Keshavarz, 2014)
In other words, are simple computer screens appropriate tools for vection research? To answer this question, we presented the same stimulus—a visual pattern of alternating black-and-white vertical or horizontal bars that has been previously shown to successfully induce circular vection in a variety of laboratory settings (Dichgans & Brandt, 1978; Hu et al, 1997; Keshavarz & Berti, 2014; Palmisano & Gillam, 1998; Webb & Griffin, 2002)—on four different displays, ranging from a very basic setting with a small FOV to a technically demanding setup including multiple projectors with a large FOV
We were interested in i-Perception whether vection is modulated by the individual level of field dependence
Summary
Vection typically describes the sensation of illusory self-motion in the absence of physical movement (Brandt, Dichgans, & Koenig, 1973; Fischer & Kornmueller, 1930; Hettinger, Schmidt, Jones, & Keshavarz, 2014). When an adjacent train starts moving, passengers on the stationary train often get the feeling of self-motion. This sensation of self-motion is perceived in the opposite direction of the moving train. Vection intensity can vary depending on several factors. We will investigated the role of further factors that could affect vection on a technical, sensory, and individual level. We varied (a) the visual display type (technical level), (b) stimulus’ motion direction (sensory level), and (c) field dependence as cognitive style (individual level), with the overall goal to determine optimal settings for investigating vection in laboratory research. We will first describe these three potential influencing factors in detail, before summarizing our hypotheses
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