Jan Antfolk

Åbo Akademi University · Department of Psychology

Because of enduring experience of managing two languages, bilinguals have been argued to develop superior executive functioning compared with monolinguals. Despite extensive investigation, there is, however, no consensus regarding the existence of such a bilingual advantage. Here we synthesized comparisons of bilinguals’ and monolinguals’ performan...

As studies indicate that people perceive COVID-19 as a threatening disease, the demand for a vaccine against the disease could be expected to be high. Vaccine safety concerns might nevertheless outweigh the perceived disease risks when an individual decides whether or not to accept the vaccine. We investigated the role of perceived risk of COVID-19...

Background We investigated if people’s response to the official recommendations during the COVID-19 pandemic is associated with conspiracy beliefs related to COVID-19, a distrust in the sources providing information on COVID-19, and an endorsement of complementary and alternative medicine (CAM). Methods The sample consisted of 1325 Finnish adults...

The number of people seeking asylum based on their sexual orientation is expected to continue increasing. Assessing the credibility of such claims to determine whether asylum-seekers meet the criteria for refugee status is a complex task for asylum officials. These assessments involve several psychological aspects, affecting applicants’ disclosure...

A series of recent studies have shown that the once-assumed cognitive advantage of bilingualism finds little support in the evidence available to date. Surprisingly, however, the view that bilingualism incurs linguistic costs (the so-called lexical deficit) has not yet been subjected to the same degree of scrutiny, despite its centrality for our un...

Sex differences in short-term mating behaviors are well-documented in human sexuality research. Existing studies usually explain sex differences in sexual behaviors through differences in mating preferences, which is theoretically problematic. Using an agent-based model, we investigated the circumstances under which males' and females' differential...

In response to the COVID-19 pandemic, the Psychological Science Accelerator coordinated three large-scale psychological studies to examine the effects of loss-gain framing, cognitive reappraisals, and autonomy framing manipulations on behavioral intentions and affective measures. The data collected (April to October 2020) included specific measures...

Victims of rape must decide whether to file a police report, and many victims decide not to report the rape to the police. The literature on the associations between demographic and individual factors and reporting rape to the police is limited. Here, we investigated the associations between demographic and individual factors (education, socioecono...

Sex workers suffer considerable marginalization, which is assumed to limit their choices and make them more likely to be exposed to various types of harm. Given this, it is relevant to examine sex workers’ professional agency and how it is associated with their quality of life. In the current study, we investigated professional agency, quality of l...

Credibility assessments are an important but complex part of asylum procedures. The current study investigated psychological assumptions underlying credibility assessments in Finnish first-instance asylum procedures and how these assumptions fit with widely accepted psychological science. Following previous research, we categorized assumptions in 5...

Religious persecution is a leading cause of global displacement. In the absence of supporting evidence, presenting a credible oral asylum claim based on religion is a difficult task for asylum-seekers. Asylum officials, in turn, face considerable challenges in evaluating the credibility of asylum-seekers' claims to determine their eligibility for r...

Objective: Mothers with multiple-partner fertility have longer interbirth intervals (IBI) than mothers with single-partner fertility, suggesting that partner change makes it harder to achieve preferred birth spacing and family planning. Previous studies have, however, overlooked possible differences in preferred IBI length. Here, we investigated ho...

The COVID-19 pandemic (and its aftermath) highlights a critical need to communicate health information effectively to the global public. Given that subtle differences in information framing can have meaningful effects on behavior, behavioral science research highlights a pressing question: Is it more effective to frame COVID-19 health messages in t...

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about...

Individually tailored vaccine hesitancy interventions are considered auspicious for decreasing vaccine hesitancy. In two studies, we measured self-reported format preference for statistical vs. anecdotal information in vaccine hesitant individuals, and experimentally manipulated the format in which COVID-19 and influenza vaccine hesitancy intervent...

Religious persecution is a leading cause of global displacement. In the absence of supporting evidence, presenting a credible oral asylum claim based on religion is a difficult task for asylum-seekers. Asylum officials, in turn, face considerable challenges in evaluating the credibility of asylum-seekers’ claims to determine their eligibility for r...

When interacting with infants, humans often alter their speech and song in ways thought to support communication. Theories of human child-rearing, informed by data on vocal signalling across species, predict that such alterations should appear globally. Here, we show acoustic differences between infant-directed and adult-directed vocalizations acro...

Significance Communicating in ways that motivate engagement in social distancing remains a critical global public health priority during the COVID-19 pandemic. This study tested motivational qualities of messages about social distancing (those that promoted choice and agency vs. those that were forceful and shaming) in 25,718 people in 89 countries...

Advantageous inequity aversion (i.e., the tendency to respond negatively to unfairness that benefits oneself) usually develops in 6–8-year-olds. However, little is known about the selection pressures that might have shaped this phenomenon. Using data collected from 120 4–8-year-old Finnish children, we tested two evolutionary explanations for the d...

Previous research has indicated that asylum interviewers—contrary to recommendations—use more closed than open questions to elicit information. In the current study, we investigated how information is elicited in asylum interviews by analysing question‐answer pairs in 105 official Finnish asylum interview transcripts. We developed a new coding fram...

The number of people seeking asylum based on their sexual orientation is expected to continue increasing. Assessing the credibility of such claims to determine whether asylum-seekers meet the criteria for refugee status is a complex task for asylum officials. These assessments involve several psychological aspects, affecting applicants’ disclosure...

The aim of the current study was to explore whether the COVID-19 pandemic has affected people’s perceptions of other vaccines and diseases than COVID-19. In two samples of Finnish adults (N = 205 in Study 1 and N = 197 in Study 2), we longitudinally investigated whether there has been a change from before the COVID-19 pandemic to during the pandemi...

Victims of rape must decide whether to file a police report, and many victims decide not to report the rape to the police. The literature on the associations between demographic and individual factors and reporting rape to the police is limited. Here, we investigated the associations between demographic and individual factors (education, socioecono...

The pursuit of justice increasingly relies on productive interactions between witnesses and investigators from diverse cultural backgrounds during investigative interviews. To date, the role of cultural context has largely been ignored by researchers in the field of investigative interviewing, despite repeated requests from practitioners and policy...

An interim report, published by Prime Minister’s Office (Publications of the Government’s analysis, assessment and research activities 2021:69) titled "The Background of the Clients in Seri Support Centers, Their use of Support Services and the Progress of the Criminal Procedure". Available only in Finnish (abstract is also available in English an...

Previous research has indicated that asylum interviewers—contrary to recommendations—use more closed than open questions to elicit information. In the current study, we investigated how information is elicited in asylum interviews by analysing question-answer pairs in 105 official Finnish asylum interview transcripts. We developed a new coding fram...

Emotions influence attitudes and appraisals toward out-groups, including prejudice. We hypothesized that individuals who successfully regulate emotions will express more positive attitudes toward out-groups. We conducted an online study of associations between emotion regulation and attitudes toward out-groups in a Finnish population-based sample (...

The behavioral immune system is considered to be a psychological adaptation that decreases the risk of infection. Research suggests that, in the current environment, this system can produce attitudes with negative health consequences, such as increased vaccine hesitancy. In three studies, we investigated whether two facets of the behavioral immune...

To test the hypothesis that infant night waking is an adaptation to increase interbirth intervals (IBIs) (i.e., the time between a mother's consecutive births) by exhausting the mother, we made an initial attempt at investigating whether maternal sleep disturbance is associated with longer IBIs. We also explored whether postpartum depression sympto...

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about...

The COVID-19 pandemic has increased negative emotions and decreased positive emotions globally. Left unchecked, these emotional changes might have a wide array of adverse impacts. To reduce negative emotions and increase positive emotions, we tested the effectiveness of reappraisal, an emotion-regulation strategy that modifies how one thinks about...

To test the hypothesis that infant night waking is an adaptation to increase interbirth intervals (i.e., the time between a mother’s consecutive births) by exhausting the mother, we investigated whether maternal sleep disturbance is associated with longer interbirth intervals. We also explored whether postpartum depression symptoms mediated the ass...

Descriptions of perpetrators given by eyewitnesses are important in criminal cases, but the accuracy of eyewitnesses is often low. Research suggests that increased distance lowers accuracy of some descriptions and children and older adults tend to be the least accurate. To investigate the effects of distance and age on descriptive accuracy simultan...

The behavioral immune system is considered to be a psychological adaptation that decreases the risk of infection. Research suggests that, in the current environment, this system can produce attitudes with negative health consequences, such as increased vaccine hesitancy. In three studies, we investigated whether two facets of the behavioral immune...

Information on the degree to which individuals can make accurate estimations of someone’s age can be of importance in legal contexts, such as child sexual abuse cases in which the victim is an adolescent. There is, however, a scarcity of studies concerning age estimations conducted with young target persons. Using facial photos of target persons ag...

Information on the degree to which individuals can make accurate estimations of someone’s age can be of importance in legal contexts, such as child sexual abuse cases in which the victim is an adolescent. There is, however, a scarcity of studies concerning age estimations conducted with young target persons. Using facial photos of target persons ag...

Credibility assessments are an important but complex part of asylum procedures. The current study investigated psychological assumptions underlying credibility assessments in Finnish first-instance asylum procedures and how these assumptions fit with widely accepted psychological science. Following previous research, we categorized assumptions in 5...

Over the past 10 years, Oosterhof and Todorov’s valence–dominance model has emerged as the most prominent account of how people evaluate faces on social dimensions. In this model, two dimensions (valence and dominance) underpin social judgements of faces. Because this model has primarily been developed and tested in Western regions, it is unclear w...

Background and objectives As the mother-offspring relationship is central to human reproduction, postpartum depression symptoms are difficult to explain in evolutionary terms. We proposed that postpartum depression might arise as a result of evolutionary mother-offspring conflict over maternal investment, and investigated the association between po...

Unfounded child sexual abuse (CSA) allegations take investigative resources from real cases and have detrimental consequences for the people involved. The Finnish Investigative Instrument of Child Sexual Abuse (FICSA) supports investigators by estimating the probability of a CSA allegation being true based on the child’s background information. In...

Background: We investigated if people’s unwillingness to comply with the official recommendations during the COVID-19 pandemic is driven by conspiracy beliefs, state reactance, a distrust in information sources, and an endorsement of complementary and alternative medicine (CAM). Methods: The sample consisted of 1325 Finnish adults who filled out an...

Objective: As COVID-19 continues to spread, researchers are working to develop a safe and effective vaccine. The success of an approved vaccine in stopping or slowing the pandemic will ultimately depend on the public’s acceptance of it. As studies indicate that people perceive COVID-19 as a threatening disease, the demand for a vaccine could be exp...

In eyewitness research the frequent use of video playback presented on a computer screen (i.e., 2D videos) in laboratory-based research is problematic due to the low realism of this method when presenting, for example, threatening (and non-threatening) first-person (and third-person) scenarios. However, in contrast to 2D videos, 360-degree videos p...

Psychological assessment scales need to be psychometrically sound, but previous research on the factorial structure of one of the most common measures of trait reactance, the Hong Psychological Reactance Scale (HPRS), has provided multiple latent structures and contradicting findings, and the statistical methodology of previous research can be crit...

Interviews with asylum seekers are an important part of investigating the applicant's need of international protection. Few studies have examined if the questions used in interviews allow detailed and accurate narratives. In the current study, we analysed question style, question type, and question order from interviews of 80 official asylum cases...

Objective The aim of the present study was to investigate whether anti-vaccination attitudes and behavior, and positive attitudes to complementary and alternative medicine (CAM), are driven by trait reactance and a distrust in medical doctors. Methods The sample consisted of 770 Finnish parents who filled out an online survey. Structural equation...

Research on students suggests that repeated feedback in simulated investigative interviews with avatars (computerized children) improves the quality of the interviews conducted in this simulated environment. It remains unclear whether also professional groups (psychologists) benefit from the training and if the effects obtained in the simulated int...

Difficulties in finding mates may have broad consequences for well-being. Previous studies often assume that only personal characteristics or competition limits mating success without considering the impact of the social context. We developed and evaluated a questionnaire for measuring context-dependent mate access by surveying 528 Finnish adults....

It is known that children and older adults produce more false alarms in target absent line-ups and that weaker facial encoding increases choosing bias. However, there has been no investigation of how age or facial encoding strength impacts line-up position selections in either sequential or simultaneous line-ups. In the present study, we presented...

Unfounded child sexual abuse (CSA) allegations take investigative resources from real cases and have detrimental consequences for the people involved. The Finnish Investigative Instrument of Child Sexual Abuse (FICSA) supports investigators by estimating the probability of a CSA allegation being true based on the child’s background information. In...

Unfounded child sexual abuse (CSA) allegations take investigative resources from real cases and have detrimental consequences for the people involved. The Finnish Investigative Instrument of Child Sexual Abuse (FICSA) supports investigators by estimating the probability of a CSA allegation being true based on the child’s background information. In...

Background and objectives: As the mother-offspring relationship is central to human reproduction, the high incidence of postpartum depression symptoms is difficult to explain in evolutionary terms. We proposed that postpartum depression might be the adverse result of evolutionary mother-offspring conflict over maternal investment, and investigated...

Although previous research has confirmed the effectiveness of simulated child sexual abuse interviews with feedback, its validation is limited to Western contexts and face-to-face settings. The present study aims to extend this research to non-Western and online/remote training conditions. Thirty-two Japanese undergraduate students were randomly as...

Across taxa, the forms of vocal signals are shaped by their functions. In humans, a salient context of vocal signaling is infant care, as human infants are altricial. Humans often produce "parent-ese", speech and song for infants that differ acoustically from ordinary speech and song, in fashions that are thought to support parent-infant communicat...

Difficulties in finding mates may have broad consequences for well-being. Previous studies often assume that only personal characteristics or competition limit mating success without considering the impact of the social context. We developed and evaluated a questionnaire for measuring context-dependent mate access by surveying 528 Finnish adults. W...

The Scharff technique aims to elicit information by affecting the source’s perception of the interviewer’s existing knowledge. Although the technique has been found to be effective for gathering new information, countermeasures to the technique have not been examined. In a 2 x 2 between-subjects experiment, we informed half of the 120 sources about...

Information and assurance from healthcare workers (HCWs) is reported by laypeople as a key factor in their decision to get vaccinated. However, previous research has shown that, as in the general population, hesitancy towards vaccines exists among HCWs as well. Previous studies further suggest that HCWs with a higher confidence in vaccinations and...

Negative emotions affect the acceptance of out-groups. Here, we investigated whether modifying negative emotions would affect perceptions of out-groups. We experimentally manipulated the use of two emotion regulation strategies: suppression of emotional expression and cognitive reappraisal, the latter involving reframing a situation to mitigate its...

Although biological factors may influence the risk of experiencing negative life events, the role of genes in the vulnerability to child victimization remains poorly understood. In a large population-based Finnish sample (N = 13,024), we retrospectively measured multiple experiences of child victimization and, in a subsample of twins (n = 9,562), w...

central tenet of nineteenth-century English naturalist Charles Darwin’s theory of evolution is the inheritance of traits from parent to offspring. These shared traits are—at least in part—the result of shared genetic material. To that end, natural selection favors genes that, when in a parent, are associated with optimizing their overall repro- duc...

The Finnish Investigative Instrument of Child Sexual Abuse (FICSA) is a computerized tool that uses Bayesian statistics to provide a base rate for an alleged child sexual abuse (CSA), using population-level information about correlates of CSA. FICSA can, thus, assist decision-making in investigations of CSA. Here, we compared forensic experts’ and...

The Finnish Investigative Instrument of Child Sexual Abuse (FICSA) is a computerized tool that uses Bayesian statistics to provide a base rate for an alleged child sexual abuse (CSA), using population-level information about correlates of CSA. FICSA can, thus, assist decision-making in investigations of CSA. Here, we compared forensic experts’ and...

Increased distance between an eyewitness and a culprit decreases the accuracy of eyewitness identifications, but the maximum distance at which reliable observations can still be made is unknown. Our aim was to identify this threshold. We hypothesized that increased distance would decrease identification, rejection accuracy, confidence and would inc...

Despite the pervasiveness of adult sexual assault (ASA), evidence-based knowledge on the risk factors for sexual victimization is insufficient. Here, we investigated the etiology of ASA in a population-based Finnish twin sample. Specifically, we estimated the extent of the genetic and environmental influences on the risk of ASA, and we examined its...