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2.4.3. Is there support for the generative drawing effect?
Mean proportion correct and SDs on the comprehension and
drawing posttests for both groups are presented in Table 2. Repeated
measures univariate analyses of variance (ANOVA) with the
comprehension pre- and post-test scores as the within-subject factors
and group (drawing versus control) as the between-subject factor
showed a main effect over time indicating that overall, participants
reached significant knowledge gains between the
comprehension pretest and the comprehension posttest, F(1,
46) = 98.97; p < .001; partial eta2 = .68. An interaction additionally
showed that these knowledge gains were significantly higher for
the drawing group than for the control group, F(1, 46) = 46.17;
p < .001; partial eta2 = .50.
For the drawing test, a repeated measures ANOVA was not possible,
since these items were only used in the posttest. In this case,
a univariate analysis of covariance (ANCOVA) predicting the drawing
test score with group (drawing versus control) as the factorial independent
variable and prior knowledge as a covariate showed that
the drawing group scored significantly better than the control group
on the drawing posttest, F(1, 45) = 13.49, p = .001, partial eta2 = .23.1
Cohen’s d favoring the drawing group over the control group was
0.85 for the comprehension posttest, and 1.15 for the drawing
posttest, all of which are considered large effects. Thus, there is strong
support for the generative drawing effect, as predicted.
Additionally, results revealed that the drawing group needed significantly
more learning time (M = 21.08 min., SD = 4.24) than the
control group (M = 17.38 min., SD = 3.33), F(1, 46) = 11.34, p = .002,
partial eta2 = .20. Thus, to test whether learning time mediates the
positive effect of drawing on text comprehension, additional mediation
analyses (Baron & Kenny, 1986) were calculated by including
learning time as an additional predictor in the aforementioned linear
model. A mediation effect would be detected if, in this case, effects
of drawing on text comprehension would significantly decrease.
Results of the mediation analyses showed that the effect of drawing
on both comprehension test scores and drawing test scores was not
fullymediated by learning time. That is, including learning time still
revealed the interaction between group (drawing versus control)
and time (pre- versus post) in that the drawing group had significantly
higher knowledge gains than the control group on the
comprehension test items (p < .001). Furthermore, the drawing group
also still outperformed the control group on the drawing posttest
after controlling for learning time (p = .009).
Furthermore, results revealed that students in the drawing group
rated their invested mental effort during learning significantly higher
(M = 5.04, SD = 1.12) than students in the control group (M = 3.96,
SD = 1.65), F(1, 46) = 7.05, p = .011, partial eta2 = .13. There was no
difference between the two groups on the perceived difficulty item
(drawing group: M = 4.08, SD = 1.50; control group: M = 4.25,
SD = 1.22; F < 1). Thus, consistent with predictions concerning the
generative drawing effect, there is partial support for the idea that
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