The contribution of peripheral flow to flow-parsing C Rogers1, S Rushton1, P Warren2 |
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1Cardiff University, United Kingdom |
| The Flow-Parsing Hypothesis (FPH; 2005, Curr Biol, 15, R542-R543) suggests that moving observers parse retinal motion into self and object motion to reveal scene-relative object movement. Recently, we investigated the contribution of peripheral flow to this process (Rogers et al, 2012, Perception, 41, 1524). We demonstrated that peripheral radial flow, presented on monitors at the side of the head, produced a signature bias in perceived trajectory for an object in central vision. Here, we examined the role of peripheral flow during lateral translation and yaw rotation with a variant of Warren and Rushton's task (2007, J Vis, 7, 1-11). Fourteen observers fixated a central stereoscopic target at a distance of 80, 95, or 110cm, which moved upwards. Simultaneously, background visual flow indicated either sideways translation or yaw rotation. Participants reported perceived target trajectory by orienting a line. As in the original study, in accordance with the FPH, target depth influenced perceived target trajectory differently for rotating than translating self-motion and the presence of stereo cues improved performance. The addition of peripheral flow did not produce a systematic improvement in performance, suggesting that the contribution of peripheral flow to the flow parsing process is limited during lateral translation and yaw rotation. |
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