One group of Ss (N = 50) had a test-retest interval of only two
or three minutes; another group (N = 50) had an interval of one day:
and the remaining Ss (N = 336) had an interval of one week. The
length of the test-retest interval, within these limits, made no appreciable
or statistically significant' differences on any of the scores. All
scores showed some slight practice effect, regardless of the time intervening
between test and retest. Therefore all the data were combined.
The means and standard deviations for all the scores on each of the
two administrations are presented in table 2, along with the reliability
Neural Correlates of Stroop Performance in Alzheimer's Disease