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Cheng X, Lou C, Ding X, Liu W, Zhang X, Fan Z, Harris J. Perceived shift of the centres of contracting and expanding optic flow fields: Different biases in the lower-right and upper-right visual quadrants. PLoS One 2019; 14:e0211912. [PMID: 30845166 PMCID: PMC6405070 DOI: 10.1371/journal.pone.0211912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Accepted: 01/22/2019] [Indexed: 11/19/2022] Open
Abstract
We studied differences in localizing the centres of flow in radially expanding and contracting patterns in different regions of the visual field. Our results suggest that the perceived centre of a peripherally viewed expanding pattern is shifted towards the fovea relative to that of a contracting pattern, but only in the lower right and upper right visual quadrants and when a single speed gradient with appropriate overall speeds of the trajectories of the moving dots was used. The biases were not systematically related to differences of sensitivity to optic flow in different quadrants. Further experiments demonstrated that the biases were likely due to a combination of two effects: an advantage of global processing in favor of the lower visual hemifield and a hemispheric asymmetry in attentional allocation in favor of motion-induced spatial displacement in the right visual hemifield. The bias in the lower right visual quadrant was speed gradient-sensitive and could be reduced to a non-significant level with the usage of multiple speed gradients, possibly due to a special role of the lower visual hemifield in extracting global information from the multiple speed gradients. A holistic processing on multiple speed gradients, rather than a predominant processing on a single speed gradient, was likely adopted. In contrast, the perceived bias in the upper right visual quadrant was overall speed-sensitive and could be reduced to a non-significant level with the reduction of the overall speeds of the trajectories. The implications of these results for understanding motion-induced spatial illusions are discussed.
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Affiliation(s)
- Xiaorong Cheng
- School of Psychology, Central China Normal University, Wuhan, China
- Key Laboratory of Adolescent Cyberpsychology and Behavior (CCNU), Ministry of Education, Wuhan, China
- Key Laboratory of Human Development and Mental Health of Hubei Province, Wuhan, China
| | - Chunmiao Lou
- School of Psychology, Central China Normal University, Wuhan, China
- Key Laboratory of Adolescent Cyberpsychology and Behavior (CCNU), Ministry of Education, Wuhan, China
- Key Laboratory of Human Development and Mental Health of Hubei Province, Wuhan, China
| | - Xianfeng Ding
- School of Psychology, Central China Normal University, Wuhan, China
- Key Laboratory of Adolescent Cyberpsychology and Behavior (CCNU), Ministry of Education, Wuhan, China
- Key Laboratory of Human Development and Mental Health of Hubei Province, Wuhan, China
| | - Wei Liu
- School of Psychology, Central China Normal University, Wuhan, China
- Key Laboratory of Adolescent Cyberpsychology and Behavior (CCNU), Ministry of Education, Wuhan, China
- Key Laboratory of Human Development and Mental Health of Hubei Province, Wuhan, China
| | - Xueling Zhang
- School of Psychology, Central China Normal University, Wuhan, China
- Key Laboratory of Adolescent Cyberpsychology and Behavior (CCNU), Ministry of Education, Wuhan, China
- Key Laboratory of Human Development and Mental Health of Hubei Province, Wuhan, China
| | - Zhao Fan
- School of Psychology, Central China Normal University, Wuhan, China
- Key Laboratory of Adolescent Cyberpsychology and Behavior (CCNU), Ministry of Education, Wuhan, China
- Key Laboratory of Human Development and Mental Health of Hubei Province, Wuhan, China
- * E-mail: (ZF); (JH)
| | - John Harris
- School of Psychology and Clinical Language Sciences, The University of Reading, Whiteknights, Reading, United Kingdom
- * E-mail: (ZF); (JH)
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Kerzel D, Hecht H, Kim NG. Time-to-passage judgments on circular trajectories are based on relative optical acceleration. PERCEPTION & PSYCHOPHYSICS 2001; 63:1153-70. [PMID: 11766941 DOI: 10.3758/bf03194531] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Current theories of arrival time have difficulty explaining performance in the common but neglected case of nonlinear approach. Global tau, a variable supposed to guide time-to-passage (TTP) judgments of objects approaching on linear trajectories, does not apply to circular movement. However, TTP judgments are surprisingly accurate in such cases. We simulated movement through a three-dimensional cloud of point-lights on various circular trajectories. Arrival-time judgments were found to be above chance when observers had to determine which of two expansionless targets would pass them first. Similar to the inside bias observed in heading studies on circular trajectories, observers showed a strong bias to select the target on the inside of their own curved motion path as passing by first. Analysis of the projected target motion revealed that targets on the inside had lower optical velocities and relatively high optical acceleration rates. Empirical TTP judgments agreed best with a strategy based on relative optical velocity changes.
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Affiliation(s)
- D Kerzel
- Max Planck Institute for Psychological Research, Munich, Germany.
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Cutting JE, Wang RF, Flückiger M, Baumberger B. Human heading judgments and object-based motion information. Vision Res 1999; 39:1079-105. [PMID: 10343828 DOI: 10.1016/s0042-6989(98)00175-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
In four experiments, we explored observers' ability to make heading judgments from simulated linear and circular translations through sparse forests and with pursuit fixation on one tree. We assessed observers' performance and information use in both regression and factorial designs. In all experiments we found that observers used three sources of object-based information to make their judgments--the displacement direction of the nearest object seen (a heuristic), inward displacement towards the fovea (an invariant) and outward deceleration (a second invariant). We found no support for the idea that observers use motion information pooled over regions of the visual field.
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Affiliation(s)
- J E Cutting
- Department of Psychology, Cornell University, Ithaca, NY 14853-7601, USA.
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