Maps
It was reflective of current understanding of the human brain, whereby certain physical areas of the brain are responsible for certain characteristics, such as fear, compassion, etc.
So yes, it was essentially a mapping of the mind. Couple that with the topographic contour lines that made up the background of the book cover (look closely
) and you have recurring imagery - mapping the mind.
But seriously, it's paper one. If you put anything that is remotely related to the stimuli and journeys, you'll get at least some marks.