In making a charcoal pencil drawing, which pictorial depth cue could you most effectively use?

How unique or different a memory record is from other things in memory refers to the memory record's ____________________

Fill in the blank(s) with correct word

In Pavlov's experiments on second-order conditioning, dogs were conditioned to salivate at the sight of a black square:

A) by pairing it with food. B) by rewarding the dog with food when it salivated in the presence of the black square. C) by presenting food first and then following it with the black square. D) even though the black square was never directly associated with food.