a mean correlation between RT and age of -.294), revealing that as age in-
creases, RT decreases. The negative correlations between age and RT also pro-
vide evidence that the younger children did not exhibit a tendency to impulsively
release the home button before making a decision. Had they done so, the trend of
decreasing RTs with increasing age would not be found. Correlations with mem-
ory span were all positive (with a mean correlation between memory span and
age of .504), revealing that as age increases, memory span increases.
One-way analyses of variance (ANOVAs) were conducted for all RT and
memory span tests to test for age effects. The sample was divided into three age
groups: 4-year-olds (children aged 4 years, 0 months to 4 years, 11.75 months),
5-year-olds (children aged 5 years, 0 months to 5 years, 11.75 months), and
6-year-olds (children aged 6 years, 0 months to 6 years, 11.75 months). Error
rate was controlled batterywise such that all RT tests were evaluated at ct = .006
(i.e., (Y = .05/Q, and all memory span tests were evaluated at (Y = .Ol (i.e., (Y =
.05/5). Age was found to have a significant effect on all RT tests except COLOR
and FIND COLOR. Further, all memory span tests were found to be significantly
affected by age.
Tukey’s post hoc analyses were conducted for all tests showing significant age
effects. These comparisons revealed a significant difference between 4-year-olds
and 6-year-olds for all RT and memory tests (with a significant overall age ef-
fect). In addition, all memory span tests except COLOR SPAN 1, and three of the
RT tests (SHAPE, NUMBER, and MATCH) revealed a significant difference
between 4-year-olds and 5-year-olds. Only two memory span tests (COLOR
SPAN 1 and COLOR SPAN 2) and one RT test (ARROWS) revealed a significant
difference between 5-year-olds and 6-year-olds.
A series of one-way ANOVAs were conducted on the mean percentage correct
across age for each of the RT tests, to detect any significant age differences in
a mean correlation between RT and age of -.294), revealing that as age in-
creases, RT decreases. The negative correlations between age and RT also pro-
vide evidence that the younger children did not exhibit a tendency to impulsively
release the home button before making a decision. Had they done so, the trend of
decreasing RTs with increasing age would not be found. Correlations with mem-
ory span were all positive (with a mean correlation between memory span and
age of .504), revealing that as age increases, memory span increases.
One-way analyses of variance (ANOVAs) were conducted for all RT and
memory span tests to test for age effects. The sample was divided into three age
groups: 4-year-olds (children aged 4 years, 0 months to 4 years, 11.75 months),
5-year-olds (children aged 5 years, 0 months to 5 years, 11.75 months), and
6-year-olds (children aged 6 years, 0 months to 6 years, 11.75 months). Error
rate was controlled batterywise such that all RT tests were evaluated at ct = .006
(i.e., (Y = .05/Q, and all memory span tests were evaluated at (Y = .Ol (i.e., (Y =
.05/5). Age was found to have a significant effect on all RT tests except COLOR
and FIND COLOR. Further, all memory span tests were found to be significantly
affected by age.
Tukey’s post hoc analyses were conducted for all tests showing significant age
effects. These comparisons revealed a significant difference between 4-year-olds
and 6-year-olds for all RT and memory tests (with a significant overall age ef-
fect). In addition, all memory span tests except COLOR SPAN 1, and three of the
RT tests (SHAPE, NUMBER, and MATCH) revealed a significant difference
between 4-year-olds and 5-year-olds. Only two memory span tests (COLOR
SPAN 1 and COLOR SPAN 2) and one RT test (ARROWS) revealed a significant
difference between 5-year-olds and 6-year-olds.
A series of one-way ANOVAs were conducted on the mean percentage correct
across age for each of the RT tests, to detect any significant age differences in
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