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C T Hall Oct 12
Replying to @AliceProverbio
Wow! What are V5 and V4 tho?
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Alice M. Proverbio Oct 12
Replying to @ChThH
V5 (or MT) is the cortical area devoted to motion processing, while V4 is devoted to color and shape (like the pentagon) processing. V4 neurons are saturated so much that the basal/rest firing rate of MT neurons is interpreted as an actual sensory signal
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Kriegeskorte Lab Oct 12
Replying to @AliceProverbio @ChThH
The illusion is amazing. Not sure I understand that explanation, though. Not every colorful texture elicits illusory motion and the perceived direction appears to depend on the shading.
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Alice M. Proverbio Oct 12
Replying to @KriegeskorteLab @ChThH
Your right, it strictly depends on receptive field sizes (the illusion changes as a function of viewing distance), V4 preference for spirals and spheres, MT involvement in 3D and stereopsis: it is a very complex interaction, rarely leading to such illusions!
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Kevin Mitchell Oct 12
I'm still deeply confused... Is there some kind of interaction between V4 and V5?
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Alice M. Proverbio Oct 12
yes! a lot of feedback and feedforward interactions!
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Kevin Mitchell Oct 12
Interesting! So, does this illusion illustrate the existence of some normal perceptual function of that interaction between V4 and V5? What is it normally doing?
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Alice M. Proverbio Oct 12
It basically represents an example of Competition within the visual cortex, whenever a signal is attenuated or suppressed for whatever reason other inputs get the chance to be represented at higher cognitive levels, thus accessing percipient awareness
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MarketCashCapital Oct 12
Replying to @AliceProverbio
Why can I make the illusion stop by focusing (staring intently) at the center but restart the illusion by not focusing?
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Alice M. Proverbio Oct 12
Replying to @MarketCrashCap
Because if you pay attention to the preferred stimuli of V4, their firing rate increase (thus contrasting repetition suppression and neural fatigue), and MT basal firing becomes under threshold
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MarketCashCapital Oct 12
Replying to @AliceProverbio
So when I am aware I fully aware of controlling the stimuli then I can change the perception. Often people perceive what is being seen versus what is the actual picture. Is this the basis for when a group has the same event happen but multiple and differing experiences?
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Alice M. Proverbio Oct 12
Replying to @MarketCrashCap
....in a way.. ;-)
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Beau Deeley Oct 17
Replying to @AliceProverbio
I'll just leave these here...
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Yonathan Russak Nov 26
So this subject just bursted here in Israel, Who's to credit for the image used? Is this a version made by ?
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Alice M. Proverbio Nov 27
Replying to @Yrussak @BeauDeeley
The artist Beau Deeley created the illusion in 2002. I tweeted the neuroscientific explanation of the illusory motion On October 12, 2018. My Original tweet has been visualized 2.6 millions times. It is healthy to see the illusion!! You SHOULD see it. Beware of ! 🙉
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Yonathan Russak Nov 27
The quetion came up because a designer named Yurii Perepadia claims he is in charge of this specific graphic, must say i like @beaedelley work better tho 👌
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Najeeb Nov 29
and but what about this claim, the one in the Instagram link?
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Alice M. Proverbio Nov 29
Which Instagram link?
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Najeeb Nov 29
Right above my tweet, in the tweet by Yonathan Russak, which was also in reply to you, 2 days ago.
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