The more he examined the subject, the more certain he became about what was needed. He would perform a craniotomy on the Uchiha.
He would conduct small incisions and surgical experiments on each area of the brainstem, observing the effect each intervention produced on the Sharingan's activity.
His Reverse Cursed Technique could heal any injury, so he was not concerned about the test subject dying unexpectedly. As long as he chose to intervene, even if the brain tissue was damaged severely, as long as the life form had not yet fully ceased, he could restore the brain within a short window.
"As I suspected. This type of eye technique relies primarily on the mental power and neural activity of the brain."
"Emotional stimulation alone does not have much practical effect. There is no viable pathway to upgrade a dual-tomoe Sharingan to three-tomoe through external stimulation.
Theoretically, with artificial intervention of this kind, creating a new Sharingan activation is extremely difficult."
He found himself mildly disappointed.
Meanwhile, the brain surgery had reduced this Uchiha to a vegetative state, capable only of receiving and responding to simple commands.
However, those commands allowed the Uchiha, having had all distracting thoughts removed, to experience the maximum possible level of emotional stimulation in isolation. This represented the limit of what the surgery could achieve in terms of triggering the brain's chakra field to operate at peak intensity.
Even so, this person's dual tomoe showed no change whatsoever.
"What a pity. The current level of scientific knowledge and available instruments in this world is relatively limited. Many external treatment tools are simply unavailable. Otherwise the surgery could be far more precise and the results I could achieve would be considerably better."
After a long period of work, he sighed and restored the Uchiha's skull using his technique. He stepped back and examined the subject.
At this moment, the Uchiha's eyes were in an unusual state. One eye displayed the red dual-tomoe Sharingan while the other had reverted to a normal black and white eye that remained closed.
Without opening that eye, Yuji used the Reverse Cursed Technique to extract the Sharingan from one socket and then allowed the eye tissue to regenerate and grow back.
His intention had been to use the Uchiha as a living test subject, combining the procedure with his Reverse Cursed Technique to explore the possibility of unlimited regenerative Sharingan production. But the final result was a clear failure.
The extracted Sharingan had lost its power completely once removed. But this was just the eye itself. The more he confirmed through observation, the more certain he became. The regenerated eye, while biologically identical in its original form, could not open the Sharingan yet.
"The removal of this eye had been made possible by years of chakra infusion and transformation, allowing the eye's flesh and blood to reach the awakening condition. It is not simply a matter of brain function. The brain is a switch, or perhaps a limiting factor, but it is not the whole mechanism."
He lowered the instrument, stroked his chin, and considered.
In other words, the eye that had grown back was, for the original form, essentially equivalent to the infant eyes present at birth. It would take time for it to fully develop into a functional Sharingan. How much time exactly, he did not yet know. It was like creating a new account in a game. The fundamental conditions for becoming a Sharingan remained the same. There was simply no way to instantly produce a dual-tomoe state.
"Alright. Move aside."
He waved his hand at the stiff-faced Uchiha. The latter, like a machine responding to input, took several steps away and stood completely motionless.
This Uchiha had undergone specific removals of certain brain tissue. To put it simply, this person had now become purely a tool that accepted only his commands. The clear sense of individual consciousness no longer existed. Only the basic thinking capacity remained intact, along with the ability to execute actions without interference.
Every profession had its specialization. Sasori's Puppet Technique allowed a ninja, after death, to become a work of art, and by utilizing the puppet core the deceased could still deploy some of their previous jutsu abilities.
A doctor could achieve something analogous through entirely different means. Compared to Sasori's art, this approach was even more complex and in certain respects more complete. This was true life medicine in the deepest sense, physical intervention directly upon the human brain, causing the subject to become an obedient vessel by erasing consciousness in the physical sense of the word.
If it were not for the relatively limited level of scientific technology currently available in this world, the results he could achieve would be considerably more precise and considerably more terrifying.
This was where a medical background produced abilities that occupied a genuinely abnormal category.
Of course, completing this kind of surgery was not simple under any circumstances. The subject needed to be under absolute control before any procedure could begin.
No one would willingly allow their skull to be opened and their brain tissue altered at will. Furthermore, he did not yet fully understand every aspect of this world's power system, which meant he could not yet integrate all of his theoretical knowledge and medical experience into practice.
Only after developing a deeper understanding of chakra principles and ninjutsu mechanics could certain more advanced procedures be attempted.
At least he knew the direction. He knew what needed to be understood.
Furthermore, although the subjects were all human beings, the ninja of this world were not the same kind of humans he had known in his previous life.
He had discovered this early during his internship at the Sand Village hospital. In terms of their life dimensions specifically, they were fundamentally different from what he had originally assumed.
Because of this world's unique power system, and primarily because of the existence of the chakra network running through every cell of the body, the ninja of this world existed on a biological level that was qualitatively distinct from ordinary human beings.
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Both the physical and cellular systems of a ninja underwent a form of transformation. The simplest way to explain it was this: in this world, ninja were merely maintaining the human form as a surface expression.
This also meant that the flesh and blood of ninja could evolve from far more angles simultaneously and achieve phenomena that would be completely unimaginable by ordinary standards.
For example, a normal ninja's chakra was like loose cement in its basic state. You used what you had and that was the limit.
Orochimaru's cursed seal technique was the equivalent of installing an expansion chip directly into a person's chakra system, adding an independent processing unit that could be implanted into the body, improving cellular genetics and increasing the rate of cell division by over three hundred percent.
The normal cellular replacement cycle ran approximately seven days for most people, though this varied based on training and physical condition.
The cursed seal's enhancement comprehensively boosted every physical attribute, including recovery speed and self-healing capacity. This type of curse mark also allowed for precise control of chakra down to the individual cell level, enabling muscle fibers to move at extraordinarily high frequencies.
The speed of energy conversion became incredibly fast. Chakra operation reached a level of efficiency that was genuinely terrifying in its implications.
After undergoing the cursed seal's reformation, while the subject remained human flesh and blood in outward appearance, the actual material composition and structural strength of the body far surpassed metal.
However, from a doctor's perspective, the side effects of this curse were obvious and severe: system overload, body overload, cellular mutation, and the constant risk of uncontrolled metamorphosis.
If super-fast cell division became uncontrollable, the ultimate consequence was the body tearing itself apart from within.
The reason he was thinking through this example was to illustrate something important. In his previous life, if an ordinary human being were subjected to this curse, failure would be guaranteed at one hundred percent.
There would be no possibility of the body surviving the process. But in this world, because of the innate life force that ninja possessed at the cellular level specifically, there existed a genuine probability of endurance.
Orochimaru's method of using cursed seals to achieve this effect represented a form of scientific mutation applied to biology.
And the direction of deliberately training the physical body to become stronger through dedicated cultivation was actually similar in its underlying mechanism to Orochimaru's cursed seal. Both operated at the cellular level.
Tsunade's strength enhancement technique followed a related principle. However, cursed seals like Orochimaru's were too dangerous and carried severe side effects.
For stability and long-term viability, cultivation through normal ninjutsu training, following Tsunade's path of transforming the body from within rather than relying on externally imposed force, was a fundamentally sounder approach.
Previously, reaching that level through cultivation alone had been relatively difficult. After all, Tsunade's ability to achieve what she had achieved was inseparable from her bloodline heritage. But now the situation was different.
With the two types of bloodline abilities providing enhanced mental strength, his chakra control had become considerably more refined.
Combined with the Blood Manipulation Technique itself, which could directly control and alter the cellular composition within his blood, the Red Scale state had already cut out a pathway in that direction. Achieving what Tsunade had achieved, by comparison, seemed only a matter of time.
And he was not limited to self-healing ninjutsu either. He had the Reverse Cursed Technique. At the point where that development was complete, he would not need to concern himself with the healing side of the equation at all.
His attention could turn entirely to the physical level of the chakra system, finding ways to upgrade the chakra system itself to a different and higher version.
But the cursed seal technique was even more interesting to him as a separate avenue of inquiry. Because this was also a potential method for enhancing the Sand Village's overall fighting power in ways that went beyond individual cultivation.
What he was doing now with the Uchiha, the capture and the experiments, was only the beginning.
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