case1601 {Sleuth2}

Sites of Short- and Long-Term Memory

Description

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.

Usage

case1601

Format

A data frame with 18 observations on the following 7 variables.

Monkey

Monkey name

Treatment

a treatment factor with levels "Control" and "Treated"

Week2

percentage of 20 objects taught 2 weeks prior to treatment that were correctly distinguished in the test

Week4

percentage of 20 objects taught 4 weeks prior to treatment that were correctly distinguished in the test

Week8

percentage of 20 objects taught 8 weeks prior to treatment that were correctly distinguished in the test

Week12

percentage of 20 objects taught 12 weeks prior to treatment that were correctly distinguished in the test

Week16

percentage of 20 objects taught 16 weeks prior to treatment that were correctly distinguished in the test

Source

Ramsey, F.L. and Schafer, D.W. (2002). The Statistical Sleuth: A Course in Methods of Data Analysis (2nd ed), Duxbury.

References

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.

Examples

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)