Abstract Metacognitive ability is enormously important for improving students’ learning performance. However, overconfidence bias may hinder students’ metacognition abilities. Therefore, in this study, we conducted an intervention to reduce or debias overconfidence among students using the KAAR (knowledge, awareness, action, and reflection) model. Ninety Indonesian undergraduate students were subjects of this study. Overconfidence scores were analyzed using paired sample t-tests in SPSS to compare the mean difference between pre- and post-tests. Next, their overconfidence patterns during the intervention were analyzed using R to perform group-based trajectory modeling (GBTM). Two main findings were noteworthy: Watching a video about overconfidence is likely the most significant activity of KAAR model in reducing students’ overconfidence, and, based on students’ overconfidence change during the intervention, trajectory analysis classified them into five groups. Recommendations for future intervention studies to reduce overconfidence among students are discussed.

Scientific reasoning ability is essential to get developed in the current digital age, particularly in the process of judgement and decision-making in complex problems. Few studies have conducted an in-depth exploration of scientific reasoning ability, especially in relation to the confidence level and gender. The scientific reasoning ability of Indonesian upper-secondary school and university students were examined and compared with previous recorded data of US students. In this study, the data were collected from 372 university and 528 upper-secondary education students in Indonesia. Students’ scientific reasoning ability was measured using a scientific formal reasoning test (FORT). In addition, confidence level and metacognitive data was collected through self-reported measures. Two-way ANOVA was performed to compare mean differences between groups based on academic level and gender and to observe interaction between the variables. Students’ confidence level in selecting the correct answer and distractor answer was analyzed using an independent t-test. The results reveal that many Indonesian students selected specific distractors with relatively high confidence. Moreover, upper-secondary school students and female students selected more distractors than the groups’ counterparts. Finally, the factors related to Indonesian students’ responses to the scientific formal reasoning were discussed. Keywords: confidence level, distractor analysis, gender differences, scientific (formal) reasoning test, scientific reasoning ability, Indonesian student

There has been the growing concern about excessive numbers of false-positive results published in the scientific literature. Cognitive bias plays a considerable role in triggering false findings that involve indirect and unwitting self-deception by scientists. This study considers the sociocultural differences in cognitive bias between Korean and Indonesian scientists. A cognitive bias assessment (CBA) was developed and administered to 184 professors, lecturer assistants, doctoral students, and master’s students in South Korea and Indonesia. The CBA results revealed some similar response patterns between Korean and Indonesian scientists. Additionally, the detection of 19 potential differential item functionings (DIFs) demonstrates the influence of sociocultural factors on how scientists interpret to each item. Finally, the Indonesian scientists scored significantly higher in optimism and belief bias. This study discusses the importance of awareness of cognitive biases, particularly the role of science education to reduce biases through systematic thinking, reasoning, and judgment by understanding scientific methods.

Genetics as a core concept of life science is essential for understanding biology. Examining genetics understanding among biology majors is becoming important since they must necessarily achieve some level of genetics understanding to advance their career. This study compares Indonesian biology majors’ genetics understanding with previously published data from students in the United States (US). This study also identifies the effect of academic year and program on genetics understanding by administering the Genetics Concept Assessment (GCA) to 377 biology majors in Indonesia. IRT-Rasch modeling was performed for instrument validation, followed by one-way ANOVA and independent sample t-test for the analysis. The results showed that Indonesian biology majors’ genetics understanding was significantly affected by academic year but was not affected by the academic program. Indonesian biology majors had a slightly similar level of genetics understanding with US non-majors’ pre-test scores, while Indonesian biology majors’ scores were two times lower than US majors’ post-test scores. The implications of reducing the gap between two countries are discussed.

The conception of racial categories from a biological perspective is unconsciously embedded in the individual’s cognition. This is true even among university students majoring in biology and medicine. Even though students have never learned about “race” explicitly in formal biology class, they are highly likely to implicitly construct, and hold biological concepts of race. This study investigated how Korean college students majoring in General Science Education define the concept of race and acquire a scientific conception of race. The study draws on Efstathiou (2009)’s framework of the “founded concept.” Two open-ended questions regarding race conceptualization were administered to 218 college students. Furthermore, interviews with three students were conducted to explore any biological meaning of race. The results suggest four types of conception held by students about race. These were race as a typological means of distinguishing human diversity, race as a biological concept, race as a social construct, and race as a bio-social mixture. Additionally, in-depth interviews indicated that students constructed their biological concept of race unintentionally through learning biology. There are three mediators which have a role as mediator in the transfiguration process of finding and founding race concepts in a biological context: skin color, reproductive isolation, and ethnicity. Accordingly, science teachers should carefully teach this information in order to help prevent any misunderstanding of biological racial concepts. Teaching strategies and other educational implications are discussed.