Jcapacity thanks for the many posts and link, theres no need to explain simple Pavlovian associations to me, i understand them well (IMO

), i think actually you and i have discussed them before in the 'How Intelligent are Snakes' thread

although re-reading my previous post, i can see how theres confusion

i am having trouble voicing my thoughts on this one.
Coming back to the OP's question, I think its more that its scent recognition, but to what level? Does a snake recognise
human scent through association as non-threatening, or can it go further to an individual humans scent being recognised? which could be described as 'owner preference'. Who knows, i would have thought we may never be able to quantify, to that extent, the level of an animals senses :shrugs: my opinion is that its exposure to human scent in general and no more.
Jcapacity:
But I do agree that an outside person doing something different to your snake such as picking it up a different way or smelling different can result in a defferent response even though the overall activity may be trying to complete the same task and it is just outside of the snakes scope of understanding.
Thats pretty much what i was trying to convey in my previous post. As in, you have to be careful putting it down to pavlovian type associations. Its not always an association the snake is making, but things you as the snake owner do which in turn could be taken as being owner preference from the snake.
You hold your snake - not gripping, moving hands slowly, you pass your snake to friend, he grips a little harder, moves hands more quickly, which in turn leads to the snake being more agitated. There may or may not be associations there, but it could/could not still be taken as owner preference, in a way.