Evidently, the perceived time sequence of events had been reversed - the participants reported seeing the cause (the dot) after the effect (the reappearance of the ring). However, the participants reported seeing the ring before the dot in around 90% of trials.
In the remaining trials, the ring should have been perceived to reappear before the dot was flashed.
As expected, it hastened the perceived reappearance of the ring, as revealed by second graph plotting motion-induced blindness duration. In 75% of the trials, the dot was perceived to appear before the reappearance of the ring. For each participant, this was timed so that the dot appeared at the exact time delay given by the PreQ 25 value in the previous trials. In the test trials, a dot was flashed for 50 milliseconds in the location of the ring after it was perceived to disappear. The data from each participant were then divided into four equal sets, and the average of the lowest 25% was calculated, to give a value called PreQ 25. This was repeated 200 times for each participant, and the reported durations in all trials - between a few hundred milliseconds and several seconds - were plotted onto a graph. In these pre-test trials, seven participants were presented with a static yellow ring on a rotating background, and asked to report when the ring disappeared from and reappeared to conscious awareness, by respectively pressing and releasing a button. The researchers first used a variation of these stimuli to test the occurence and duration of the motion-induced blindness effect. Exactly how it works is unclear according to one hypothesis it is due to the properties of neurons in area V1 of the visual cortex. Then replay the clip and focus on any of the yellow spots you'll see that it is a visual disappearance illusion. Fixate on the flashing green spot in the centre, and you'll notice that the surrounding yellow spots begin to disappear and reappear after about ten seconds. The illusion, described in the journal Current Biology by a team of researchers from France, suggests that the unconscious representation of a visual object is processed for around one tenth of a second before it enters conscious awareness.Ĭhien-Te Wu and his colleagues at the Brain and Cognition Research Centre in Toulouse used a visual phenomenon called motion-induced blindness, in which a constantly rotating background causes prominent and motionless visual stimuli to disappear and reappear, as demonstrated in the video below. Huge library of effects, and many more.A novel temporal illusion, in which the cause of an event is perceived to occur after the event itself, provides some insight into the brain mechanisms underlying conscious perception.
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