8. We all know our senses, but what other senses are out there… radar electrical detection Navigation by Smell
9. We all know our senses, but what other senses are out there… night vision pheromone detection magnetic field navigation
10. We all know our senses, but what other senses are out there… Temperature detection ultra violet vision
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12. A ‘different’ Threshold I am writing this to you today, in order to illustrate the concept of difference threshold. It is not like absolute threshold, so don’t confuse the two. Difference threshold is the minimum difference in stimulus required for you to detect a change. It is the ‘just noticeable difference’. It is hard to understand when reading because your eyes, when you follow directions, adjust to the next level of text without noticing a change. It does take a while for your sense of sight to say, “ hey, something is not right here”.