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BRIEF REPORT
Adult Age Differences in Hindsight Bias: The Role of Recall Ability
Julia Groß and Ute J. Bayen
Heinrich-Heine-Universität Düsseldorf
Hindsight bias, that is, the overestimation of one’s prior knowledge of outcomes after the actual outcomes
are known, is stronger in older than young adults (e.g., Bayen, Erdfelder, Bearden, & Lozito, 2006). The
authors investigated whether age differences in the recall of original judgments account for this
difference. Multinomial model-based analyses of data from a hindsight memory task revealed that biased
reconstruction of original judgments was equally likely in both age groups when recall of original
judgments was lowered in young adults via a manipulation of retention interval. These results support a
recall-based explanation of age differences in hindsight bias.
Keywords: aging, hindsight bias, recall, multinomial model
Given the growing proportion of older adults in the world’s
population (United Nations, 2013), understanding effects of aging
on memory and judgment is increasingly relevant. A hard-to-avoid
and ubiquitous bias in memory and judgment is hindsight bias:
After learning about facts or outcomes of events, people tend to
overestimate what they knew about these facts or events before-
hand. Hindsight bias may therefore narrow the search for potential
explanations for an event. This may, for instance, lead to prema-
ture assignment of guilt, in legal decision making (e.g., Berlin,
2000;Harley, 2007).
Typically, in studies of hindsight bias, participants are asked to
provide original judgments (OJs) to difficult questions (e.g., “How
many African nations are there?”) and must later recall the OJs
(recall of original judgment, ROJ). For experimental items, as
opposed to control items, the correct judgment (CJ) is provided
before recall. In this case, participants typically recall their OJs
with lower probability (recollection bias) and/or, when the OJ is
not recalled, OJ reconstruction is biased toward the CJ (recon-
struction bias). Both biases constitute hindsight bias.
Hindsight bias is well researched and robust (cf. Blank, Musch,
& Pohl, 2007). However, only a handful of studies have examined
its occurrence in old age (Bayen et al., 2006;Bernstein, Erdfelder,
Meltzoff, Peria, & Loftus, 2011;Coolin, Bernstein, Thornton, &
Thornton, 2014;Groß & Bayen, 2015). These indicate larger
hindsight bias in older compared to young adults; yet the sources
of this age difference still need to be clarified.
One possible explanation is that older adults’ deficits in inhib-
itory control (e.g., Hasher & Zacks, 1988;Lustig, Hasher, &
Zacks, 2007) may increase the biasing effect of the CJ on OJ
recollection and/or on OJ reconstruction (cf. Bayen, Pohl, Erd-
felder, & Auer, 2007). Both Coolin, Erdfelder, Bernstein, Thorn-
ton, & Thornton (2014) and Groß and Bayen (2015) found evi-
dence in support of this explanation; however, age differences in
inhibitory function could not fully account for age differences in
hindsight bias.
Another possible explanation for age differences in hindsight
bias are age differences in recall ability. It is well established that
the average ability to recall information from episodic memory is
lower in older than in young adults (e.g., Verhaeghen, Marcoen, &
Goossens, 1993). Accordingly, in hindsight studies, young adults
recalled more of their OJs than older adults (Bayen et al., 2006;
Bernstein et al., 2011;Groß & Bayen, 2015). Since perfectly
recalling one’s OJ precludes the occurrence of hindsight bias (cf.
Pohl, 2007), lower OJ recall increases the number of items that
remain for hindsight bias to occur, thereby increasing its proba-
bility.
Bayen et al. (2006) used Erdfelder and Buchner’s (1998) multi-
nomial processing tree (MPT) model to estimate separate contri-
butions of overall recollection, recollection bias, and reconstruc-
tion bias to age differences in hindsight bias. They found that both
lower overall recollection and larger probability of reconstruction
bias underlay age differences in hindsight bias, whereas age dif-
ferences in recollection bias contributed only little. In both Bern-
stein et al.’s (2011) and Coolin, Erdfelder, et al.’s (2014) studies,
older adults showed lower overall recollection and descriptively
higher probability of reconstruction bias; however, the latter dif-
ference did not reach statistical significance. Coolin, Erdfelder, et
al. (2014) found a significant (yet small) recollection bias in older,
This article was published Online First April 20, 2015.
Julia Groß and Ute J. Bayen, Institute for Experimental Psychology,
Heinrich-Heine-Universität Düsseldorf.
This work was in part supported by Grant BA 3539/4-1 from the
Deutsche Forschungsgemeinschaft and the Research Initiative “Age(ing):
Cultural Concepts and Practical Realisations” of the Heinrich-Heine-
Universität Düsseldorf. We thank Siegmund Switala for technical assis-
tance and Marie Bernadette Bette, Anne Hagen, Diana Kuhl, and Claudia
Roth for help with data collection. We thank Morten Moshagen for his help
with modeling interactions with the MPT model.
Correspondence concerning this article should be addressed to Julia Groß,
Heinrich-Heine-Universität Düsseldorf, Institute for Experimental Psychol-
ogy, Building 23.02., Universitätsstr. 1, D-40225 Germany. E-mail: gross@
hhu.de
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Psychology and Aging © 2015 American Psychological Association
2015, Vol. 30, No. 2, 253–258 0882-7974/15/$12.00 http://dx.doi.org/10.1037/pag0000017
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