Integration of motion energy from overlapping random background noise increases perceived speed of coherently moving stimuli.
The perception of visual motion can be profoundly influenced by visual context. To gain insight into how the visual system represents motion speed, we investigated how a background stimulus that did not move in a net direction influenced the perceived speed of a center stimulus. Visual stimuli were two overlapping random-dot patterns. The center stimulus moved coherently in a fixed direction, whereas the background stimulus moved randomly. We found that human subjects perceived the speed of the center stimulus to be significantly faster than its veridical speed when the background contained motion noise. Interestingly, the perceived speed was tuned to the noise level of the background. When the speed of the center stimulus was low, the highest perceived speed was reached when the background had a low level of motion noise. As the center speed increased, the peak perceived speed was reached at a progressively higher background noise level. The effect of speed overestimation required the center stimulus to overlap with the background. Increasing the background size within a certain range enhanced the effect, suggesting spatial integration. The speed overestimation was significantly reduced or abolished when the center stimulus and the background stimulus had different colors, or when they were placed at different depths. When the center- and background-stimuli were perceptually separable, speed overestimation was correlated with perceptual similarity between the center- and background-stimuli. These results suggest that integration of motion energy from random motion noise has a significant impact on speed perception. Our findings put new constraints on models regarding the neural basis of speed perception.
Department of Neuroscience, School of Medical and Public Health, McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, Wisconsin.
Jason
J
Chuang
Department of Neuroscience, School of Medical and Public Health, McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, Wisconsin.
Emily C
EC
Ausloos
Department of Neuroscience, School of Medical and Public Health, McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, Wisconsin.
Courtney A
CA
Schwebach
Department of Neuroscience, School of Medical and Public Health, McPherson Eye Research Institute, University of Wisconsin-Madison, Madison, Wisconsin Xin.Huang@wisc.edu.
Xin
X
Huang
D000704:Analysis of Variance; D002755:Choice Behavior; D003867:Depth Perception / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009038:Motion; D009039:Motion Perception / Q000502:physiology*; D009622:Noise; D010364:Pattern Recognition, Visual / Q000502:physiology*; D010470:Perceptual Masking / Q000502:physiology*; D010775:Photic Stimulation; D011601:Psychophysics
center-surround interaction; color cue; neural coding; segmentation; spatiotemporal frequency; speed perception; stereoscopic depth; visual motion processing
Vision Res. 2006 Sep;46(17):2728-34
16600321
Vision Res. 1999 Jul;39(14):2411-20
10367061
J Neurophysiol. 2014 Mar;111(6):1203-13
24371295
Vision Res. 1975 Nov;15(11):1231-8
1198935
J Vis. 2011 Dec 05;11(5):11
22144564
J Neurophysiol. 1994 Jun;71(6):2305-24
7931519
J Neurosci. 1992 Dec;12(12):4745-65
1464765
J Neurophysiol. 2012 Jun;107(12):3370-84
22423001
J Opt Soc Am A. 1985 Feb;2(2):322-41
3973764
Scand J Psychol. 1983;24(4):257-65
6665526
Biol Cybern. 2001 Sep;85(3):159-65
11561817
J Opt Soc Am A. 1985 Feb;2(2):284-99
3973762
J Neurosci. 2015 Jun 24;35(25):9381-90
26109661
J Neurosci. 2001 Dec 1;21(23):9387-402
11717372
PLoS One. 2012;7(11):e48649
23139808
Nat Neurosci. 2001 May;4(5):526-32
11319562
Eur J Neurosci. 1995 Nov 1;7(11):2261-76
8563975
Perception. 2002;31(5):603-15
12044100
J Neurosci. 2005 Jan 19;25(3):711-22
15659609
Perception. 1973;2(4):425-7
4803951
J Neurophysiol. 1986 Jun;55(6):1308-27
3016210
Nat Rev Neurosci. 2000 Nov;1(2):125-32
11252775
Trends Neurosci. 1993 Jul;16(7):263-8
7689769
Nat Neurosci. 2004 Jul;7(7):764-72
15195097
Cereb Cortex. 1994 May-Jun;4(3):247-59
8075530
Vision Res. 2009 Jan;49(2):284-6
19013480
Vision Res. 1993 Oct;33(15):2091-107
8266651
J Neurophysiol. 2013 Nov;110(9):2007-18
23926031
Nature. 1995 Feb 16;373(6515):609-11
7854417
Nature. 1990 Mar 8;344(6262):153-5
2308632
Nat Neurosci. 1999 Jul;2(7):595-6
10404177
J Neurophysiol. 2011 Mar;105(3):1199-211
21191092
J Neurophysiol. 2005 Mar;93(3):1809-15
15483068
Brain Res. 1971 Dec 24;35(2):528-32
5002708
J Neurophysiol. 1983 May;49(5):1127-47
6864242
Nat Neurosci. 2006 Apr;9(4):578-85
16547513
J Neurosci. 2006 Aug 30;26(35):8988-98
16943555
Vis Neurosci. 1991 Jan;6(1):3-13
2025610
J Neurophysiol. 1993 Jan;69(1):19-39
8433131
Perception. 1996;25(7):815-30
8923551
J Neurophysiol. 1989 Jul;62(1):31-47
2754480
J Neurophysiol. 2007 Jan;97(1):272-82
17021018
J Neurosci. 2005 Oct 26;25(43):10049-60
16251454
J Neurosci. 1988 Jun;8(6):2201-11
3385495
J Neurosci. 2004 Feb 25;24(8):1907-16
14985431
J Neurosci. 2003 Jul 2;23(13):5650-61
12843268
Perception. 1999;28(6):703-9
10664765
Nature. 1974 Dec 20;252(5485):732-3
4437629
Nature. 1990 Jul 12;346(6280):174-7
2366872