TABLE 1

An example of the order of discriminations used in the ASST of rats that were shifted from digging media to odors as the relevant dimension

The correct exemplar is shown in bold and was paired with either of two exemplars from the irrelevant dimension across trials within each discrimination problems, (i.e., at the CD phase, the shredded paper was paired with either spicy or vanilla odor, etc). In the IDS and EDS, there were novel pairs of exemplars for each dimension. The combination of exemplars into positive and negative stimuli and their spatial presentation in the cage was a pseudorandom series determined in advance.

PhaseRelevant DimensionCorrect ExemplarDiscrimination between:
SDMediumShredded paperShredded paperMetallic filler
CDMediumShredded paperShredded paperMetallic filler
SpicyVanilla
Rev 1MediumMetallic fillerShredded paperMetallic filler
SpicyVanilla
IDMediumClay pelletsClay pelletsSilk
RumCream
Rev 2MediumSilkClay pelletsSilk
RumCream
EDOdorLemonLemonAlmond
Cotton woolCrumpled tissue
Rev 3OdorAlmondLemonAlmond
Cotton woolCrumpled tissue