Question: how many augmentations can you implement on your body before Cyberpsychosis takes hold of you?
Is there a definitive amount, an exact specification where you start losing it? Do some augmentations take more of your empathy/humanity than the others?
Finally, is the cyberpsychosis a guaranteed thing if you upgrade your body with augmentations, no matter whether you pace it out over the years or just go full body conversion within a single year?
Good questions...
There is no set number, it's different for everyone.
First everyone has a Humanity score... The humanity score is equal to your characters Empathy stat (one of 9, the other stats are INTelligence, REFlexes, COOL, ATTRactivness, BODy, Movement Allowance, TECH, and LUCK). Empathy is a measure of how well you relate to others, and the skills it adds to are all interpersonal skills... For example - Human Perception, and Persuasion, Seduction, and Perform.
Non augmented human Stats have a range from 1 to 10, with 1 being extremely handicapped and 10 being the height of human perfection.
Your Humanity score is your empathy multiplied by 10. So a character with a fairly high level of EMP, say a 9, will have 90 points of humanity. They will also be naturally adapt at relating, and being relatable, to other people. While a low EMP person, say a 3, will have a very hard time getting along with others, or even relating to them.
On the cybernetics side, most cybernetics incur some amount of humanity loss. The general rules is that the more intrusive, or inhuman the prosthetic or augmentation is, the more humanity loss it will incur. Most things have a randomizer, say for instance a Cyberarm will incur 2d6 points of humanity loss (thats 2 6-sided dice added together). But Muscle and Bone Lace, a nanotech treatment that makes you physically stronger (increases your BOD stat) only incurs a 1d6/2 humanity loss (one 6-sided die, divide the result in half). So even individual cyberentics will have wildly different effects on your humanity.
Some Cyber, usually small options, or purely cosmetic ones, such as light tattoos or getting a filter for your cyberoptic light Thermograph, will have a small but set amount of Humanity Loss... usually between .5 and 2 points.
Cyber weapons, or options that drastically change the bodies appearance, or function in a way totally alien to the human body, with incur higher humanity loss.
For something incredibly drastic, like a Full Cyborg Conversion, the humanity loss is severe.... The lowest Humanity loss available for a Borg body is 16d6.... thats for either the Alpha Class body, the most basic of bodies, or the Gemini Class, a body that appears human from the outside (your average Ghost In The Shell or Terminator type body in outward appearance).
Humanity loss can be reduced. Getting a limb covered in Realskin reduces the HL of that limb by 1d6/2 points. There is also therapy, different types with different results. Some drugs also help, as do behavorial inhibitors otherwise known as "Moddies".
For every ten points of Humanity Lost, your empathy drops 1 point. When your humanity gets below 30 (EMP of 3) you begin to suffer the effects of Cyber Psychosis. You begin to feel cold towards other people, twitchy, you have problems focusing or being patient with other people. Below 20 these effects worsen, and you find your self short tempered and unpleasant. Below 10 Humanity you become violent, antisocial, and tend to fly into violent outbursts, having episodes of rage, lashing out agsint the meat that no longer accepts you, or fails to recognize your superiority. At this point you are full on Cyberpsycho, and its only a matter of time before C-SWAT takes you out. If your EMP drops below Zero, that rage is a permanent state... you are completely out of control, a rampaging monster.
As you can see its different for everyone... some characters will never get close to cyberpsychosis, others will flip out even with very light augmentation....