Sites of Short- and Long-Term Memory
Researchers taught 18 monkeys to distinguish each of 100 pairs of objects, 20 pairs each at 16, 12, 8, 4, and 2 weeks prior to a treatment. After this training, they blocked access to the hippocampal formation in 11 of the monkeys. All monkeys were then tested on their ability to distinguish the objects. The five-dimensional response for each monkey is the number of correct objects distinguished among those taught at 16, 12, 8, 4, and 2 weeks prior to treatment.
case1601
A data frame with 18 observations on the following 7 variables.
MonkeyMonkey name
Treatmenta treatment factor with levels "Control" and
"Treated"
Week2percentage of 20 objects taught 2 weeks prior to treatment that were correctly distinguished in the test
Week4percentage of 20 objects taught 4 weeks prior to treatment that were correctly distinguished in the test
Week8percentage of 20 objects taught 8 weeks prior to treatment that were correctly distinguished in the test
Week12percentage of 20 objects taught 12 weeks prior to treatment that were correctly distinguished in the test
Week16percentage of 20 objects taught 16 weeks prior to treatment that were correctly distinguished in the test
Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.
Sola-Morgan, S. M. and Squire, L. R. (1990). The Primate Hippocampal Formation: Evidence for a Time-limited Role in Memory Storage, Science 250: 288–290.
str(case1601) # short-term response short <- with(case1601, (Week2 + Week4)/2) # long-term response long <- with(case1601, (Week8 + Week12 + Week16)/3) # Multivariate analysis of variance mfit <- manova(cbind(short,long) ~ Treatment, case1601) summary(mfit)
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