Ok, so Brain Ooze has this kind of attack : Melee 2 tentacles +13 touch (1d6 electricity plus neural pulse). "Neural Pulse (Su) Creatures hit by a brain ooze's tentacle must succeed at a DC 18 Fortitude save or take 1d6 points of Intelligence damage and be staggered for 1d4 rounds. Each time a brain ooze causes Intelligence damage, it gains 5 temporary hit points. The save DC is Constitution-based."
So ooze attacks aasimar and deals less than 6 elecitricty damage. Does neural pulse appy anyway?
Yes it still applies because it says "creatures hit by" not "creatures damaged by"
Unclear. I can't find any text on rider effects, though it seems to be a common ruling that negating the damage from the primary attack negates any rider effects, and I thought I remember some designer posting on the subject. For that matter, it isn't clear whether neural pulse is a rider effect.
i think the key word here is "plus"
As in they both happen together the same way a 1d6 plus grab attack still allows the grab even if DR negated the damage.