Table 1.

Order of discriminations for the attentional set-shifting task

DiscriminationDimensionsExemplar combinations
RelevantIrrelevant+
SDMediumM1M2
CDMediumTextureM1/T1M2/T2
M1/T2M2/T1
IDSMediumTextureM3/T3M4/T4
M3/T4M4/T3
REVMediumTextureM4/T3M3/T4
M4/T4M3/T3
EDSTextureMediumT5/M5T6/M6
T5/M6T6/M5
  • Example of a typical sequence of discriminations, including the task-relevant dimension and all possible exemplar combinations. Half the rats switched from medium to texture and half switched from texture to medium. The correct exemplar is shown in bold for each discrimination and was paired with either exemplar from the irrelevant dimension. In the IDS and EDS, the stimuli were novel exemplars of each dimension. The order of presentation of exemplars and the assignment of exemplars into positive (+) and negative (−) stimuli were randomized in advance.