I have not read that book. Nevertheless, here are some comments that may give you a leg up. No doubt you are familiar with the sensory systems. Growing up most people learned the three main systems: visual, auditory, and kinesthetic (although more have been identified.). Unimpaired, humans can use all systems but most if not all are also believed to have a preference. That simply means that some types of stimuli get a person’s attention more quickly than others, registering faster and more intensely in their brain. My brain’s opinion is that if you know their sensory preference, gift-giving is much easier.