Hall–Pearce transfer (Hall & Pearce

Hall–Pearce transfer (Hall & Pearce, 1979), a well-known effect which is said to be due to reduced attention to the CS, can also be interpreted in terms of the role of the US in the transfer phase. In Hall–Pearce’s transfer effect, shock intensity is increased from Phase 1 to Phase 2with groups receiving either the same (Group No Change) or a different CS (Group Change) in the second phase. More rapid conditioning occurred in Group Change. In this group the memory of strong shock can be retrieved at the outset of Phase 2, whereas in Group No Change there is, initially, a tendency to retrieve the
memory of weak shock from Phase 1. When, eventually, the memory of strong shock is retrieved in Group No Change, its capacity to signal the US should be reduced relatively to that memory in Group Change which had been associated with the CS from the outset of Phase 2.