This seems to imply that perception “waits” to integrate information as long as 450ms before the percept occurs. Furthermore, it seems that integration occurs in *discrete* time windows: visual elements integrate only when they are presented in the same discrete time-window.
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There is no integration even between elements in close spatiotemporal proximity if they are presented in different windows.
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In more detail, we use the Sequential Metacontrast SQM paradigm in which pairs of bars presented in sequence are perceived as two expanding motion streams (column 1 in this figure).pic.twitter.com/sxHYD96AQw
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We can insert a vernier (i.e., two vertical bars with a horizontal offset) at any point in the stream.
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In this case, the offset is seen as “transported” along the motion stream: observers see the entire motion stream with an offset, even though the offset is only really present at one location in the stream (columns 2&3 in the above figure).
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Interestingly, the perceptual effect of a first vernier can be cancelled or enhanced by a second vernier presented much later in the stream (columns 4&5 in the above figure).
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In the case when the two verniers have opposite offsets, they integrate even though they are far apart they "cancel out", and observers do not see any offset at all in the stream – all bars appear aligned. When the two verniers have the same offset direction, the "add up".
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We show that this effect is *mandatory* up to 450ms for half of our observers and up to at least 290 for the rest. Furthermore, we show that this integration is a discrete process.
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Looks very interesting. Congrats!
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Congratulations, very interesting article. The question is why despite this have a whole perceptual concept.
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