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Spontaneous neuronal activity is the state in which we are thinking.

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".


Neuronal activity is spontaneous. Stanislas Duanne's Computer In his simulation, he didn't have to keep stimulating the network.

Even in the absence of input, neurons fired spontaneously, guided by randomly occurring events at synapses. Activities that were initially chaotic eventually self-organized into precise patterns.

If you set an enormous value for the arousal parameter, a complex firing pattern will grow /

The decline was also observed on the computer screen. We could also confirm that the global ignition had occurred without inputting the stimulus.

Even without stimulus, the network self-organized into a series of accidental ignitions.

Spontaneous activity occurs in the higher dimensional cortex of the workspace area and propagates down to the sensory cortex. This movement is the opposite of what is perceived by an external stimulus.

Outbursts of such endogenous activity also occur in the actual brain.

The two cerebral hemispheres constantly generate large, high-frequency brain waves, whether the person is awake or asleep.

And this fact is familiar to anyone who has seen EEG records. This spontaneous excitement strongly dominates brain activity. In comparison, the activities evoked by external stimuli are fragile.

The nervous system primarily functions as an autonomous device that produces its thought patterns.

Even when we rest in the dark and "think nothing", our brains produce constantly changing neuronal activity.

Brain images show that the brain is not calm even at rest, and the pattern of cortical activity is constantly changing. Moreover, a global network, normally distributed across two hemispheres, is activated similarly by everyone.

For example, a language circuit fires spontaneously when listening to a story and when standing still in the dark.

This fact shows the concept of "inner language".

The meaning of resting activities is still controversial among neuroscientists.

There is a counterargument. In some cases, it is merely an accidental discharge of the brain along with an existing anatomically connected network.

Some related activities are also found in unconscious patients during sleep under anaesthesia.

"In subjects who are awake and focused, another part seems to directly indicate the existence of the thoughts that are working at that very moment," Duanne argues.

For example, a resting network, called the default mode network, is always switched on when you think about your situation, do an autobiographical retrospective, or compare your thoughts with others.

Laying subjects on a scanner, waiting for their brains to enter default mode, and then asking what they were thinking, thought more freely and indulged in memory recall than when asked at other times. There is a high percentage of them responding that they were.

A spontaneously activated resting network is at least partially an indication of a person's mental state.

In short, the constant discharge of neurons is causing meditation.

Also, this internal flow of thought is competing with the outside world.

During high levels of default mode activity, sudden presentation of stimuli such as images does not produce large P3 waves, unlike when paying attention to the outside world.

When deeply ponders, the intrinsic state of consciousness (spontaneous brain activity) extends to the global workspace and competes with the outside world.

During high levels of default mode activity, sudden presentation of stimuli such as images does not produce large P3 waves, unlike when paying attention to the outside world.

Spontaneous brain activity extends to the global workspace, blocking access to other stimuli for an extended period when deeply depressed.

The "inattentional blindness" mentioned in the previous article is a form of this phenomenon. Computer simulations showed precisely the same intrinsic activity.

Spontaneous ignitions happened in front of us, and increasing the value of the arousal parameter tended to increase wide-area consistency.

External inputs stimulated the network during this period. Still, even if its intensity was well above the average ignition threshold, it prevented activity progress and did not lead to a global ignition.

The brain cannot pay attention to multiple things at the same time.

Therefore, in some cases, the same input stimulus leads to explosive ignition, while in other cases, it causes little activity.

It depends on whether the noise level activity pattern that precedes the stimulus matches the input series of spikes.

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