How rate sensitive are borrowers? Slight uptick in interest rates leads to decline in mortgage applications

Are mortgage borrowers sensitive to small movements in interest rates? Recent data shows that refinances are on the rise thanks to low interest rates, but what happens if mortgage rates start to move back up? Will that demand dry up just as quickly as it appeared, even if rates only pick up by a few basis points? It appears that may be the case, as new data from the MBA shows that mortgage applications fell for the second straight week as mortgage rates increased for the first time in more than a month.