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Discussion on two papers| old_uid | 3550 |
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| title | Discussion on two papers |
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| start_date | 2007/11/29 |
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| schedule | 16h |
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| online | no |
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| summary | Motoyoshi, I. Temporal freezing of visual features. Current Biology,
Volume 17, Issue 11
Our perception at any moment has been thought to reflect neural
activities at that moment. Recent psychophysical studies, however,
have revealed severe dissociations between the perceptual and physical
timing of visual events, as for example in the 'flash-lag' effect
[1–3] and illusory asynchrony [4,5]. Here, I introduce a novel
illusion in which time (transition) appears to stand still. When a
subjective surface formed by a 'Kanizsa' figure is abruptly presented
on a background of dynamically changing color and texture, the color
and texture appear to be stable within the surface for approximately
200 milliseconds. The illusion is consistent with the notion that the
visual system fills-in color and texture information over a wide
temporal interval unless a salient signal of the change is given.
http://www.labo-perception.org/users/pjc/pdfs/motoyoshi07.pdf ;
Max R. Dürsteler, The Freezing Rotation Illusion (Nature preprint)
The freezing rotation illusion arises when a figure is continuously
rotating in front of a back and forth rotating ground. The term
"freezing rotation" designates the decrease in the perceived rotation
speed of a figure when the figure and the ground are turning in equal
directions. Subjects had to estimate the rotation speed of a
continuously turning figure while the ground was either turning
opposite to or with the figure. Their estimations of the figure's
speed were significantly lower, when the ground was moving in the same
direction as the figure. In control experiments subjects had to
estimate the ground's speed while the figure was turning opposite to
or with the ground. Overall, their estimations of the rotational speed
of the ground were not significantly influenced by the rotational
direction of the figure.
http://www.labo-perception.org/users/pjc/pdfs/duersteler07.pdf |
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| responsibles | Cousineau, Barthelme |
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