In standard recognition tests, subjects are demonstrated a test thing and are requested to choose whether the thing was seen already (an "old" thing) or was not seen (a “new" thing). In the event that you ascertain the extent of times that the subject said OLD and the thing was on the list, you get the hit rate. Simply taking a hit rate discloses to you nothing about the capacity of the subject to segregate amongst old and new things. You should likewise look at the false caution rate, the extent of times that the subject said New yet the test thing was not on the rundown.