At UCLA, the brain was made to see things that don't exist.

The California Institute of Technology has developed two optical-acoustic illusions that demonstrate the retroactive nature of the brain. We see not what is, but well thought out details that logically fit into the overall picture - this is called postdict. And it turns out that it can be controlled.

In the first experiment, three sound signals were given with an interval of 58 milliseconds, and when the first was applied, the lamp on the left also came on, and in the third, the lamp on the right. There was no light in the center, but when the setup was turned on again, the test subjects said they saw the light in the center. However, if the beeper was turned off, the subjects saw only two real bulbs. The third, non-existent central, appears in the imagination precisely as a compensation for disorder - since three sounds sound, there must be three lights.

A similar retroactive mechanism manifested itself in the second experiment, called the Invisible Rabbit, which differed from the first by replacing signals. Now there were three lights on, but the soundtrack was only for two of them - and again the brain stubbornly wanted to notice both three light sources and three sound sources. Scientists have proven that sound affects vision, neural signal processing, and the brain's subconscious perception of a picture.

However, everything deteriorated as soon as the intervals between signals began to increase. Scientists have had a lot of discussion trying to establish the line that separates conscious thinking from acting on reflexes. Some argued that the brain begins to actively work within 80 milliseconds after receiving a signal, while others stretched the period up to 500 milliseconds. The fact is that after half a second of observation, the brain is already guaranteed to react to the extra signal, as to a mistake or deception. But where is the line beyond which the mind simply does not have time to work - remains to be seen.