Slow discrimination of contrast-defined expansion patterns

被引:16
作者
Allen, HA [1 ]
Derrington, AM [1 ]
机构
[1] Univ Nottingham, Sch Psychol, Nottingham NG7 2RD, England
基金
英国惠康基金; 英国医学研究理事会;
关键词
second order motion; optic flow; visual search;
D O I
10.1016/S0042-6989(99)00223-0
中图分类号
Q189 [神经科学];
学科分类号
071006 ;
摘要
We compared observers' performance in the same complex motion discrimination task using stimuli defined by luminance or by contrast. They were asked to discriminate between a centred expansion pattern, constructed from four patches of outwards motion, and a distorted expansion pattern? constructed with one patch containing inwards motion and three patches containing outwards motion. We measured performance versus duration and found that for luminance-defined patterns, observers were able to discriminate correctly between these patterns in 75% of trials when the stimulus duration was 200 ms. For contrast-defined patterns, observers required over 2 s to reach this level of performance. Observers did not require such long durations to discriminate correctly between the contrast-defined expansion patterns when-the patterns contained fewer patches or when the distorted patterns contained more patches of inwards motion. This suggests that observers performed the task by searching for a patch that contained a pattern moving inwards. There was no such effect on performance with the luminance-defined patterns. These results also suggest that contrast-defined patterns are processed too slowly to provide an input to specialised optic flow detectors that, guide navigation in real lime. Further, the differences in performance may be due to processing delays from sequential processing of the contrast-defined local motion signals. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:735 / 744
页数:10
相关论文
共 25 条
[1]   SPATIOTEMPORAL ENERGY MODELS FOR THE PERCEPTION OF MOTION [J].
ADELSON, EH ;
BERGEN, JR .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 1985, 2 (02) :284-299
[2]  
Ashida H, 1998, PERCEPTION, V27, P181
[3]  
Bex PJ, 1998, PERCEPTION, V27, P237
[4]   Large receptive fields for optic flow detection in humans [J].
Burr, DC ;
Morrone, MC ;
Vaina, LM .
VISION RESEARCH, 1998, 38 (12) :1731-1743
[5]   DRIFT-BALANCED RANDOM STIMULI - A GENERAL BASIS FOR STUDYING NON-FOURIER MOTION PERCEPTION [J].
CHUBB, C ;
SPERLING, G .
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, 1988, 5 (11) :1986-2007
[6]   Second-order motion discrimination by feature-tracking [J].
Derrington, AM ;
Ukkonen, OI .
VISION RESEARCH, 1999, 39 (08) :1465-1475
[7]   SEPARATE DETECTORS FOR SIMPLE AND COMPLEX GRATING PATTERNS [J].
DERRINGTON, AM ;
BADCOCK, DR .
VISION RESEARCH, 1985, 25 (12) :1869-1878
[8]   KINETIC DEPTH EFFECT AND OPTIC FLOW .1. 3D SHAPE FROM FOURIER MOTION [J].
DOSHER, BA ;
LANDY, MS ;
SPERLING, G .
VISION RESEARCH, 1989, 29 (12) :1789-1813
[9]   HUMAN SENSITIVITY TO EXPANDING AND ROTATING MOTION - EFFECTS OF COMPLEMENTARY MASKING AND DIRECTIONAL STRUCTURE [J].
FREEMAN, TCA ;
HARRIS, MG .
VISION RESEARCH, 1992, 32 (01) :81-87
[10]  
Gibson J. J., 1950, PERCEPTION VISUAL WO