Intra-modal stream/bounce effect: A signal detection study

Tan, Tong Yong (2014). Intra-modal stream/bounce effect: A signal detection study Honours Thesis, School of Psychology, The University of Queensland.

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Author Tan, Tong Yong
Thesis Title Intra-modal stream/bounce effect: A signal detection study
School, Centre or Institute School of Psychology
Institution The University of Queensland
Publication date 2014-10-08
Thesis type Honours Thesis
Supervisor Philip Grove
Total pages 79
Language eng
Subjects 1701 Psychology
Abstract/Summary The stream/bounce effect refers to a simple visual display in which two identical discs move towards one another along a collinear trajectory, superimpose in the centre of the display and continue to the opposite side of the display. Although the display is equally consistent with the discs “streaming” past each other or “bouncing” after superimposing, streaming is the dominant perception. However, when a transient such as a visual flash is presented at the point of coincidence, the dominant perception switches to bouncing. It is unclear what level of processing, sensory or decisional, in the perceptual system is responsible for this switching in the resolution of these displays. Signal Detection Theory can independently characterise sensory and decisional contributions in many perceptual phenomena. To date, only three studies have employed this theory to study the stream/bounce effect. However, their findings were conflicting and focused on the crossmodal audiovisual stream/bounce effect. The present study aims to investigate whether the intra-modal stream/bounce effect, with either a visual flash or a pause at the point of coincidence could be explained by sensory, decisional, or both processes. Three withinsubjects experiments were conducted. Thirty participants each observed 800 motion sequences and indicated whether the disks streamed or bounced. Significant differences in sensitivity between transient and no-transient displays were observed in some conditions and significant differences in response bias between transient and no-transient displays were observed in all conditions. This suggests that the intra-modal stream/bounce effect is mediated by both sensory and decisional processes. Limitations and future directions were discussed.
Keyword Signal detection theory
Stream/bounce effect
Visual display

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Created: Thu, 30 Apr 2015, 15:31:44 EST by Louise Grainger on behalf of School of Psychology