Hi Gang,

Great - thank you! I realize this is probably overkill, but just to ensure my understanding of the models based on R only: would the following lme4 commands correspond to the 3dLME models of interest?
[condition = repeated measure of time, four levels (hour, day, week, month)]

Does the effect of forgetting (average D' for each condition across subjects) predict brain activity? This map would represent areas that vary with Dprime irregardless of the effect of condition.
lmer(activation~ (1 + Dprime) + condition)

>> 3dLME -prefix myOutput -jobs 8 \
-model "Dprime" \
-qVars "Dprime" \
-ranEff '~1+Dprime' \

When controlling for the effect of forgetting (average D' for each condition across subjects), does condition predict brain activity? This map would represent areas that vary across conditions when controlling for Dprime.
lmer(activation~ (1 + Dprime | condition))

>> 3dLME -prefix myOutput -jobs 8 \
-model "Dprime+condition" \
-qVars "Dprime" \
-ranEff '~1+Dprime' \
...