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In the Matrix part II and the beginning of part III the crew member who was infected by Agent Smith (Bane) cuts himself.
The female crew member in part III who brought Trinity food told her the same and speculated that they might be "VDT's".
I don't fully understand this. What are VDT's and why would Agent Smith engage in self-cutting unless he has borderline personality disorder or depression or something?
Bane's actions, in terms of cutting himself, seem to be motivated by sensory overload. Although he's experienced a range of inputs before, the sheer volume and intensity of the five human senses, especially sound and smell (something he mentioned in the first film as being one of his personal triggers) are simply overwhelming to him.
The film's original script specifically states that his reason for cutting his skin is to give him a single sensation to focus his attention on while he waits for Neo.
Bane sits hidden in the shadowed caves connecting Zion to the dock. He crouches in an alcove, both arms marked with dozens of knife cuts.
His eyes are animal wide, shifting, blinking, reacting to every sound, every smell but always returning his attention to the cut as if using it to focus his thoughts.
Finally, through the tangle of pipes and stalactites, he sees what he has been waiting for: Neo.
Matrix Reloaded: Script
As to what VDTs are, the simple answer is that we don't know.
Smith is made by the machines which view everything as an equation. Neo and Smith are polar opposites balancing out an equation. Neo's goodness, kindness and love are balanced with Smith's anger and hatred for all things human. When Smith enters a human body (Bane) he can't help but harm it even though he is feeling the pain of doing so.
My guess is that being a virtually immortal, overpowered (guardian-)program that found itself in the real world, Bane (Smith) started cutting himself to experience something real. Sure, he could feel pain in the matrix when, and if, he was hit or shot, but that pain was virtual, he'd shrug it off instantly. In the real world, the pain stayed with him, it gave him an understanding of the real world, of his limitations therein, and possibly, a further understanding of the human condition (though this last part is iffy, considering how he couldn't understand Neo even after beating him up in the end of Revolutions).
