Thanks for that added information, i'll check those out!

Question, would enjoyment be an emotion or pleasure? Thus these could enable a person to maintain more concentration because they're happy/having fun/ Perhaps these do not fit into the "strong" emotions category.

Edit: so reading the 5 hinderances is interesting. I guess I was thinking the author was suggesting "all emotions" and using those three(hate, etc) as examples rather than there being a select few "negative emotions" which can hinder concentration. Thanks!