Abstract
Supplementing text-based learning materials with diagrams typically increases students’ free recall and cued recall of the presented information. In the present experiments, we examined competing hypotheses for why this occurs. More specifically, although diagrams are visual, they also serve to repeat information from the text they accompany. Both visual presentation and repetition are known to aid students’ recall of information. To examine to what extent diagrams aid recall because they are visual or repetitive (or both), we had college students in two experiments (n = 320) read a science text about how lightning storms develop before completing free-recall and cued-recall tests over the presented information. Between groups, we manipulated the format and repetition of target pieces of information in the study materials using a 2 (visual presentation of target information: diagrams present vs. diagrams absent) × 2 (repetition of target information: present vs. absent) between-participants factorial design. Repetition increased both the free recall and cued recall of target information, and this occurred regardless of whether that repetition was in the form of text or a diagram. In contrast, the visual presentation of information never aided free recall. Furthermore, visual presentation alone did not significantly aid cued recall when participants studied the materials once before the test (Experiment 1) but did when they studied the materials twice (Experiment 2). Taken together, the results of the present experiments demonstrate the important role of repetition (i.e., that diagrams repeat information from the text) over the visual nature of diagrams in producing the benefits of diagrams for recall.
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Notes
Although we did not collect demographics from the particular participants in either experiment, on the basis of course-assessment measures, we know that the subject pool from which we acquired our participants is typically composed of about 70 % women and 30 % men. In terms of race and ethnicity, it is also typically composed of about 70 % White/Caucasian people, 20 % Hispanic/Latino people, 10 % Black/African-American people, 5 % Asian/Asian-American people, 2 % American Indian or Alaskan Native people, less than 1 % Native Hawaiian or Pacific Island people, and 2 % people who respond “other.” Our subject pool often includes people who report more than one race or ethnicity, which is why these percentages total over 100 %. Furthermore, this subject pool is typically 65 % college freshmen, 20 % college sophomores, 10 % college juniors, and 5 % college seniors. In terms of age, around 50 % of the people in the subject pool typically report that they are 18 years of age or younger, 25 % report that they are 19 years of age, 15 % report that they are 20 years of age, 5 % report that they are 21 years of age, and 5 % report that they are 22 years of age or older. We expect that our samples in Experiments 1 and 2 were demographically similar to the larger subject pool from which they were derived.
Given that there were no major differences in transfer performance across the groups in either experiment (and overall transfer performance was somewhat low), it seems possible that these instructions might have led participants to focus on studying the materials to answer retention questions rather than transfer questions. Although this reduces the conclusions we can draw from performance on the transfer questions, this does not affect the conclusions we can draw from performance on the retention questions.
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Appendix
Appendix
Analyses using study time as a covariate
Given that study time differed by group in the present experiments, we repeated the analyses for Experiments 1 and 2 using study time as a covariate in additional 2 (presence of diagrams: yes vs. no) × 2 (presence of repetition: yes vs. no) factorial ANOVAs (see also Mautone & Mayer, 2007, for a similar analysis). Overall, including study time as a covariate did not affect the conclusions of the original analyses: Repetition of information was largely responsible for the effects of diagrams on free recall, but both repetition and the visual aspect of diagrams were responsible for the effects of diagrams on cued recall. For completeness, however, we felt that it was appropriate to report these additional analyses for interested readers. Note that in Experiment 2, we used total study time across the two study phases as the covariate.
ANCOVA results for experiment 1
Free recall
Study time was significantly related to the free recall of target information, F(1, 155) = 7.2, MSE = 816.1, p = .008, η p 2 = .05, but the effect of repetition on the free recall of target information was only marginally significant after controlling for study time, F(1, 155) = 3.3, MSE = 816.1, p = .07, η p 2 = .02. The presence of diagrams did not affect the free recall of target information. When we analyzed the free recall of control information the same way, study time was significantly related to free recall, F(1, 155) = 5.4, MSE = 604.6, p = .02, η p 2 = .03, but neither the presence of diagrams nor the presence of repetition affected this measure.
Cued recall
Study time was significantly related to the cued recall of target information, F(1, 155) = 14.3, MSE = 749.3, p < .001, η p 2 = .09, but the effects of repetition, F(1, 155) = 4.0, MSE = 749.3, p = .047, η p 2 = .03, and diagrams, F(1, 155) = 4.9, MSE = 749.3, p = .03, η p 2 = .03, on the cued recall of target information were both significant after controlling for study time. When we analyzed the cued recall of control information the same way, study time was significantly related to cued recall, F(1, 155) = 8.2, MSE = 578.5, p = .005, η p 2 = .05, but neither the presence of diagrams nor the presence of repetition affected this measure.
Transfer performance
Study time was significantly related to transfer performance, F(1, 155) = 7.6, MSE = 0.9, p = .006, η p 2 = .05. The effect of diagrams on transfer performance was only marginally significant after controlling for study time, F(1, 155) = 2.9, MSE = 0.9, p = .09, η p 2 = .02, and the effect of repetition was not significant.
ANCOVA results for experiment 2
Free recall
Study time was significantly related to the free recall of target information, F(1, 155) = 41.1, MSE = 851.3, p < .001, η p 2 = .2, but the presence of diagrams did not affect the free recall of target information. After controlling for study time, the effect of repetition on the free recall of target information was significant, F(1, 155) = 10.7, MSE = 851.3, p = .001, η p 2 = .07, as was the interaction between the presence of diagrams and the presence of repetition, F(1, 155) = 4.6, MSE = 851.3, p = .03, η p 2 = .03. When we analyzed the free recall of control information the same way, study time was significantly related to free recall, F(1, 155) = 37.7, MSE = 569.8, p < .001, η p 2 = .2, but the presence of repetition did not affect this measure. The presence of diagrams increased the free recall of control information in this situation, F(1, 155) = 9.0, MSE = 569.8, p = .003, η p 2 = .06 (see also Serra, 2010).
Cued recall
Study time was significantly related to the cued recall of target information, F(1, 155) = 14.4, MSE = 568.3, p < .001, η p 2 = .08, but the effects of both repetition, F(1, 155) = 6.5, MSE = 568.3, p = .01, η p 2 = .04, and diagrams, F(1, 155) = 15.4, MSE = 568.3, p < .001, η p 2 = .09, on the cued recall of target information remained significant after controlling for study time. When we analyzed the cued recall of control information the same way, study time was significantly related to this measure, F(1, 155) = 10.7, MSE = 633.6, p = .001, η p 2 = .06, but neither the presence of diagrams nor the presence of repetition affected it.
Transfer performance
Study time was not significantly related to transfer performance, and neither diagrams nor repetition affected transfer performance after controlling for study time.
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Ortegren, F.R., Serra, M.J. & England, B.D. Examining competing hypotheses for the effects of diagrams on recall for text. Mem Cogn 43, 70–84 (2015). https://doi.org/10.3758/s13421-014-0429-7
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DOI: https://doi.org/10.3758/s13421-014-0429-7