The way I see +Ne/-Ni is like this. Its like lacking the ability to stay on task. +Ne/-Ni constantly has to be stimulated differently. Its looking for anything new and original. It has to hard time doing repetition. In fact, it hates repetition(a lot of this goes in with how the other functions fit into model A also, like lacking the ability to complete is +Se unvalued). The +Ne side of it likes to see things from all the different possible aspects. It doesn't like to be stuck in one mode. It likes to vary to the extreme degree. Because it varies so much, +Ne/-Ni also lacks the ability to take the careful care of their bodies(-Si lacking). Because +Ne/-Ni strives to be original, it hates conformity. This means that -Se will have to be valued. +Ne/-Ni types have a strong need to not follow, but to be in the limelight. They want to be looked at as a non-follower, as a rebel. This would mean that -Se would be a unconscious motivator, or an agenda. So an +Ne/-Nis need to be original happens because they have an agenda to rebel. Because +Ne/-Ni sees all the possibilities in things, they tend to see all the possible scenarios for disaster too, like seizing to exist. This would make a +Ne/-Ni type have a sense of anxiety about things, and a fear of death. They often have existential anxiety.
Now this is the way I see -Ne/+Ni. Its similar to desiring the ability to stay on task. It doesn't like to be stimulated differently, it likes routine and consistency. It prefers normalcy. It prefers repetition. The -Ne side means that it views things in either a right or wrong way. ( I remember arguing with a INTp one time about whether a baseball can be neither fair or foul. The INTp said that it had to be either fair or foul, it couldn't be either or neither. I said that he was wrong because he was unable to see the infinite about of relative planes that one could view the situation from, and also the idea of whether or not we are subjective to the true absolute reality. We debated for the longest. And while I thought he was wrong, he was right in the context in which he was thinking it of probably. But INTps lack the ability to change contexts. They do not know how to do this.) Because -Ne/+Ni is good at tedious repetitive tasks, they will have to value +Se. +Se means that they are able to finish things and they prefer consistency. Because of this they lack initiative to start new things, this because they do not like to leave the old things behind. -Si is also valued, so they will have the ability to closely take care of their hygiene, in other words, take care of their bodies tedious tasks. Also, because -Ne/+Ne types see things in black and white, and they believe they have a definite answer for things, they tend to have a sense of security. They do not tend to be afraid of anything.