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What should not be seen due to blindsight is unconsciously visible.

Updated: May 29, 2022

(Cognitive science) In coaching, rewriting the unconscious is a powerful means of achieving the goal.

By studying "Study of Consciousness", I would like to think about my method and the coaching theory, such as unconscious rewriting.


This series of blog posts is my study note.

 

Damage to the primary visual cortex deprives the person of conscious vision.

This symptom is called blindsight.


They claim that they cannot see anything in a particular part of the field of vision.

However, when the experimenter shows them something or sheds light on them, they point to it.


Some visual-related information is transmitted from the retina to the hands, bypassing the damage that causes blindsight.


Blind experiments using fMRI showed evidence that the superior colliculus was strongly activated by a target invisible to the subject, but at the same time, the cortex was also activated.


Later studies demonstrated that invisible stimuli somehow bypass the injured primary visual cortex and activate both the thalamus and the cortex's higher visual cortex.



The patient cases reported in a study by Canadian psychologist Melvin Goodale strongly support the cortical involvement in unconscious processing.


One patient experienced carbon monoxide poisoning at the age of 34.

In doing so, oxygen deficiency causes significant irreparable damage to the visual cortex on both the left and right sides, resulting in the patient losing the most basic ability of conscious perception, which neurologists call "visual agnosia". I had a disability.


The patient was blind in shape recognition and could not distinguish between a square and an elongated rectangle.

The obstacle was so severe that she couldn't even recognize whether the line was vertical, horizontal or diagonal.


However, the gesturing system was still working well, so when I instructed the card to be posted through the diagonal slit, the patient could post it correctly.


The patient's motor system was always able to "see" something more accurately than consciousness.



Also, when trying to grab something, they adjusted the hand's grip correctly to the object's size, but I couldn't do it when I asked to grab it between my index finger and thumb.


The patient's unconscious ability to perform movements is far superior to perceiving the same shape consciously.


She was unaware of herself, but information about the size and orientation of the object is unknowingly transmitted through the occipital and parietal lobes.


An intact neural circuit extracts visual information about size, position, and shape that cannot be consciously seen.


Since then, much research has been done on patients with severe blindsight and amnesia.


Some patients, claiming complete blindness, can walk through busy corridors without hitting people or things.

Some people experience an unconscious state called "space neglect."


The patient cannot pay attention to the space on the left side due to damage to the right hemisphere, especially around the inferior parietal lobe.

Because of this, they often overlook the entire left side of landscapes and objects.


For example, one patient who complained about the amount of food ate only the food on the right side of the plate and

I didn't notice that the left side remained.


Patients with spatial neglect symptoms make false reports with severely impaired conscious judgment, but the left visual field is not truly blind.


Although the retina and early-stage visual cortex are fully functional, they cannot focus on information in the left visual field and convey it to the level of consciousness.


John Marshall and Peter Harrigan paint a picture of two homes for a space-ignoring patient

(One house is burning on the left side, the other is not burning)

When I showed the patient


The patient claimed that there was no difference between the two homes, but when asked which one he wanted to live in, he pointed to the one that wasn't burning.


There is quite a lot of information in the brain, and it seems essential how to use it.

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