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The timing of consciousness is after 250 ms.

Updated: May 29, 2022

「Studying the "Study of Consciousness" (Stanislas Duanne) can further deepen your understanding of coaching theory.

I am studying to add a unique flavour to "unconscious rewriting".


This series of blog posts are my study notes. This time, the theme that follows the unconscious and conscious

I will write a "sign of consciousness".


 

Conscious perception produces a variety of consequences. When we notice an event, there are countless possibilities. For example, you can use words and gestures to report on it or store it in your memory and remember it later.


Let's think about the certainty of the experiments explained so far.


Looking at the target causes a series of brain processes at that point.

Invisible target does not lead to activity in various areas of the brain.

You can only tell that you haven't seen anything at the end of the experiment.

Due to the time history, the brain's activity may have changed.


In an experiment to find out this, Masuda changed the period from displaying the target to gradually displaying the mask.

Then, the correct answer rate and the visibility rate (the rate at which the subject saw the target) were recorded in each period.

When I drew a graph with the period on the horizontal axis and the grades and visibility on the vertical axis, I drew a U-shaped curve.


The curve representing the correct answer rate draws a U-shape means that two periods showed the same result.

However, the visibility was different between these two periods.

In addition, more robust activation was observed in the dorsolateral prefrontal cortex during the period with higher visibility.


According to EEG records, early-stage brain activation was the same up to approximately 250 ms.


But after 250ms, the P3 wave is better with a conscious trial.

It was bigger than the unconscious trial.


The unconscious stimulus only caused a small positive EEG in the posterior parietal cortex.

In contrast, conscious perception expanded to the left and right frontal lobes.


We found that avalanches of brain activity disappeared quickly in the unconscious trial, and no widespread P3 activity occurred.

The P3 waves that extend to the left and right prefrontal cortex reflect the neural activity peculiar to conscious perception.

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