Can spiders sense fear in people who are afraid of them aka. arachnaphobian?

No...Spiders cannot sense fear. Spiders do not have a sense of smell or emotional response. What they do sense is the jerky rapid movements that people who are afraid of them make. I work with tarantulas and I tell people that no matter how afraid they are, if they don't make sudden jerky movements then the tarantula will not run or act erratically. It works every time, I have people who are so terrified of tarantulas that they are shaking, but as long as they hold still, the tarantula is calm and does not make sudden movements