Individual Differences In Behavior Research Articles

Examining personality dimensions in rats using a caregiver questionnaire

Measures of individual behavioural differences (personality) are highly valuable in many areas of ethology, particularly studies of animal emotion and welfare. However, there are limitations to current behavioural tests of personality. Caregiver questionnaires may provide a complementary approach to overcome some of these limitations and provide a richer insight into personality. Drawing on previous studies, we developed a questionnaire in which caregivers were asked to rate the extent to which a given adjective/term described a rat under their care. We then used factor analysis to identify personality dimensions and assess whether those dimensions mapped to rat sex, rat age, number of companions, predator exposure, or owner experience. We obtained usable data from 296 rat caregivers and identified six personality dimensions: tameness, shyness, liveliness, interspecific sociability, inquisitiveness, aggressiveness. These dimensions are, with the exception of ‘inquisitiveness’, in line with previous studies and the broader literature on personality in non-human animals. With the exception of shyness, which was significantly associated with sex and owner experience, we found no strong evidence for a relationship between the personality dimensions and age, sex, number of companions, predator exposure, or owner experience. Although there remain important issues to be answered by future research, such as whether there is interobserver agreement in personality ratings and the extent to which the personality ratings are repeatable over time, the present study indicates that questionnaires of caregivers could in future provide a valuable tool to assess personality in rats.

The role of neural reward sensitivity in the longitudinal relations between parents’ familism values and Latinx American youth’s prosocial behaviors

Past research suggests that parents’ familism values play a positive role in Latinx American youth’s prosocial tendencies. However, little is known about how individual differences in youth’s neural development may contribute to this developmental process. Therefore, using two-wave longitudinal data of 1916 early adolescents (mean age = 9.90 years; 50% girls) and their parents (mean age = 38.43 years; 90% mothers) from the Adolescent Brain Cognitive Development study, this pre-registered study took a biopsychosocial approach to examine the moderating role of youth’s neural reward sensitivity in the link between parents’ familism values and youth’s prosocial behaviors. Results showed that parents’ familism values were associated with increased prosocial behaviors among youth two years later, controlling for baseline prosocial behaviors and demographic covariates. Notably, parents’ familism values played a larger role in promoting youth’s prosocial behaviors among youth who showed lower ventral striatum activation during reward anticipation. Moreover, such association between parents’ familism values and youth’s later prosocial behaviors was stronger among youth who showed lower levels of prosocial behaviors initially. Taken together, the findings highlight individual differences in neurobiological development and baseline prosocial behaviors as markers of sensitivity to cultural environments with regard to Latinx American youth’s prosocial development.

Brain connectivity patterns associated with individual differences in the access to experience-near personal semantics: a resting-state fMRI study

It has been proposed that a continuum of specificity exists between episodic and semantic autobiographical memory. Personal semantics have been theorized to situate intermediately on this continuum, with more “experience-near” personal semantics (enPS) closer to the episodic end. We used individual differences in behavior as a model to investigate brain networks associated with the access to episodic autobiographical (EAM) and enPS information, assessing the relation between performance in the EAM and enPS conditions of the Autobiographical Fluency Task (AFT) and intrinsic brain connectivity. Results of an intrinsic connectivity contrast analysis showed that the global connectivity of two clusters in the left and right posterior cingulate cortex (PCC) was predicted by performance in the enPS conditions. Moreover, enPS scores predicted the connectivity strength of the right PCC with the bilateral anterior hippocampus (aHC), anterior middle temporal gyrus (aMTG) and medial orbitofrontal cortex, and the left aMTG and PCC. enPS scores also predicted the connectivity strength of the left PCC with the bilateral HC and MTG. The network highlighted involves parts of the core and of the dorsal medial subsystems of the Default Mode Network, in line with the proposal that enPS represents an intermediate entity between episodic and semantic memory.

Can eating behaviour traits be explained by underlying, latent factors? An exploratory and confirmatory factor analysis

Eating Behaviour Traits (EBTs) are psychological constructs developed to explain patterns of eating behaviour, including factors that motivate people to (over or under) eat. There is a need to align and clarify their unique contributions and harmonise the understanding they offer for human eating behaviour. Therefore, the current study examined whether 18 commonly cited EBTs could be explained by underlying, latent factors (domains of eating behaviour). An exploratory factor analysis (EFA) was used to identify latent factors, and these factors were validated using a confirmatory factor analysis (CFA). 1279 participants including the general public and members of a weight management programme were included in the analysis (957 females, 317 males, 3 others, 2 prefer not to say), with a mean age of 54 years (median = 57 years, SD = 12.03) and a mean BMI of 31.93 kg/m2 (median = 30.86, SD = 6.00). The participants completed 8 questionnaires which included 18 commonly cited EBTs and the dataset was split at random with a 70/30 ratio to conduct the EFA (n = 893) and CFA (n = 383). The results supported a four-factor model which indicated that EBTs can be organised into four domains: reactive, restricted, emotional, and homeostatic eating. The four-factor model also significantly predicted self-reported BMI and weight change. Future research should test whether this factor structure is replicated in more diverse populations, and including other EBTs, to advance these domains of eating as a unifying framework for studying individual differences in human eating behaviour.

Differences in Approach and Avoidance Motivation Sensitivities Predicting Participation and Performance in Strength Sport

Abstract Cusimano, K, Freeman, P, Moran, J, and Yamaguchi, M. Differences in approach and avoidance motivation sensitivities predicting participation and performance in strength sport. J Strength Cond Res 38(1): 180–184, 2024—Gray's Reinforcement Sensitivity Theory proposes that individual differences in behavior are due to the sensitivity to 2 brain systems: the behavioral inhibition system (BIS), which regulates aversive emotions to threatening stimuli, and the behavioral approach system (BAS), which regulates positive emotions toward rewarding or nonpunishing stimuli. The current study investigated whether BIS and BAS sensitivity predicts participation and performance in strength sports. A sample of 177 competitive strength athletes (male = 148; female = 29; mean age = 28.68; SD = 6.24 years) and 178 control participants (male = 89; female = 89; mean age = 29.39; SD = 7.42) completed the BIS/BAS scale, with strength athletes also providing their Wilks scores as a measure of sporting performance. Independent t tests showed significantly higher BIS (MD = 2.37, p = 0.003, 95% CI [0.79, 3.94], d = 0.31) and total BAS (MD = 11.71, p < 0.001, 95% CI [9.26, 14.15], d = 1.00) sensitivity in strength athletes than individuals in the control group. A 3-step hierarchical regression analysis revealed that the number of training years (β = 0.506, p < 0 .001), BIS (β = −203, p = 0.005) and BAS drive (β = 0.188, p = 0.012) made significant unique contributions to predicting the Wilks score, with no significant contributions of age, sex, BAS fun seeking, and BAS reward responsiveness. The findings indicate that the overall reward sensitivity (total BAS score) and reward seeking (BAS drive) are associated positively with participation and performance in strength sports, respectively. Given the association of these brain systems to addiction and other psychiatric disorders, the findings could have implications in psychiatric treatment and sporting recruitment.

Group phenotypic composition drives task performances in ants.

Differences in individual behaviour within a group can give rise to functional dissimilarities between groups, particularly in social animals. However, how individual behavioural phenotypes translate into the group phenotype remains unclear. Here, we investigate whether individual behavioural type affects group performance in a eusocial species, the ant Aphaenogaster senilis. We measured individual behavioural traits and created groups of workers with similar behavioural type, either high-exploratory or low-exploratory workers. We tested these groups in four different, ecologically relevant, tasks: reaction to an intruder, prey retrieval from a maze, nest relocation and tool use. We show that, compared to groups of low-exploratory workers, groups of high-exploratory workers were more aggressive towards intruders, more efficient in collecting prey, faster in nest relocation and more likely to perform tool use. Our results demonstrate a strong link between individual and collective behaviour in ants. This supports the 'behavioural type hypothesis' for group dynamics, which suggests that an individual's behaviour in a social environment reflects its own behavioural type. The average behavioural phenotype of a group can therefore be predicted from the behavioural types of individual group members.

The role of cognitive control and referential complexity on adults' choice of referring expressions: Testing and expanding the referential complexity scale.

This study aims to advance our understanding of the nature and source(s) of individual differences in pragmatic language behavior over the adult lifespan. Across four story continuation experiments, we probed adults' (N = 496 participants, ages 18-82) choice of referential forms (i.e., names vs. pronouns to refer to the main character). Our manipulations were based on Fossard et al.'s (2018) scale of referential complexity which varies according to the visual properties of the scene: low complexity (one character), intermediate complexity (two characters of different genders), and high complexity (two characters of the same gender). Since pronouns signal topic continuity (i.e., that the discourse will continue to be about the same referent), the use of pronouns is expected to decrease as referential complexity increases. The choice of names versus pronouns, therefore, provides insight into participants' perception of the topicality of a referent, and whether that varies by age and cognitive capacity. In Experiment 1, we used the scale to test the association between referential choice, aging, and cognition, identifying a link between older adults' switching skills and optimal referential choice. In Experiments 2-4, we tested novel manipulations that could impact the scale and found both the TIMING of a competitor referent's presence and EMPHASIS placed on competitors modulated referential choice, leading us to refine the scale for future use. Collectively, Experiments 1-4 highlight what type of contextual information is prioritized at different ages, revealing older adults' preserved sensitivity to (visual) scene complexity but reduced sensitivity to linguistic prominence cues, compared to younger adults. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Complexities of consistent individual behavioral differences in effective wildlife management

Complexities of consistent individual behavioral differences in effective wildlife management

AH Share Price Spread: Investors Sentiment Study

This paper develops a comprehensive index of sentiment differences that can accurately describe the differences in investor sentiment between mainland China and Hong Kong to explain the higher premium of A-shares more than H-shares in the long run from the perspective of market differences in individual investor behavior. The results show that the higher the level of optimism of the A-share market relative to the H-share market, the higher the level of A-H share premium; Research shows that investors are more susceptible to the hazards of emotional elements during the market downturn phase, that emotional differences have an amplifying effect on the explanatory power of AH share premiums, and the higher the institutional share of stocks differences emotional, the more substantial explanatory power on AH share premiums. We should take notice of the critical role of irrational factors in price fluctuations and have certain psychological expectations about the fluctuations of stock prices caused by irrational factors.

Suicidal Behavior in Eating Disorders

Many studies have shown that people with eating disorders have higher rates of suicidal ideation, suicide attempts, and completed suicide than the general population. One of the diseases with the highest suicide rate among psychiatric disorders is anorexia nervosa. Some hypotheses have been proposed to explain possible causes of increased suicidal behavior in eating disorders. Some conditions common to eating disorders and suicidal behavior, such as dissatisfaction with the body and interoceptive deficits, have been cited. It has been conclusively shown that psychiatric comorbidity, especially the co-diagnosis of depression, increases the risk of suicide in patients with eating disorders. However, increased suicidal behavior in eating disorders cannot be explained by comorbidity alone. The interpersonal psychological theory of suicide (IPTS), developed by Joiner, aims to understand why people commit suicide and to explain the differences in individual suicidal behavior. Some researchers have thought that the increased suicidal behavior of people with eating disorders, especially anorexia nervosa patients, is expected from the perspective of IPTS. The compensatory behaviors of patients with eating disorders, such as vomiting or chronic restrictive food intake, are painful and challenging actions for the body. It can be considered that repeated encounters with painful and challenging experiences form a habit in the individual and reduce pain avoidance. When viewed from the IPTS perspective, decreased pain avoidance may explain the increased suicide attempts and completed suicides of individuals. Clinicians working with eating disorder patients must conduct regular and comprehensive assessments of suicide. Comorbidities such as major depression, anxiety disorder, and substance-use disorder should not be overlooked in patients with eating disorders and should be taken seriously.

The diffusion path of distributed photovoltaic power generation technology driven by individual behavior

The widespread adoption of distributed photovoltaic (PV) power generation technologies among electricity consumers is a crucial factor in enabling the power system's low-carbon transition. While extensive research has explored consumers' willingness to adopt this technology, prior studies have primarily focused on static psychological factors. This study, however, takes a heterogeneous behavioral perspective by examining the dynamic effects of individual behavioral interactions on technology diffusion. Utilizing behavior-driven simulation technology, we developed a diffusion model pertaining to photovoltaic power generation technology. The model enhances the explanatory capacity and predictive accuracy of subjects' behavioral choices by quantifying the effects of adoption scale and external economic interventions. Our simulation results indicate that residential environment constraints, resulting from individual behavioral differences, can influence the diffusion potential of technology. Furthermore, non-mandatory promotion methods are more effective in enhancing user adoption willingness. Interestingly, we found that free installation interventions tend to reduce the diffusion effect in later stages and should not be implemented in isolation. These insights can contribute to enhancing the diffusion of distributed PV power generation technology and furthering the development of low-carbon electricity.

The Reasoning through Evidence versus Advice (EvA) Scale: Scale Development and Validation

Our well-being can improve when people heed evidence rather than simply follow familiar or charismatic advisors who neglect evidence. We developed the Reasoning through Evidence versus Advice (EvA) scale to measure individual differences in reasoning through evidence like science and statistics versus following advisors such as politicians and celebrities. No existing scales directly measure these tendencies; moreover, it was theoretically unknown whether they reflect a single dimension (from evidence- to advice-based) or distinct tendencies to value or distrust each. Our scale validation process included qualitative interviews and four studies that involved 1583 respondents (753 college graduates, 830 non-college graduates) in which we conducted exploratory and confirmatory factor analyses and tests of convergent validity, discriminant validity, and measurement invariance by gender and education. This process yielded a 16-item EvA scale with four dimensions: Pro-evidence, Anti-evidence, Pro-advice, and Anti-advice. In assessing criterion validity, these tendencies identified individual differences in important, real-world attitudes and behaviors, including susceptibility to health misinformation, adherence to CDC guidelines on social distancing, confidence in the COVID vaccine, science curiosity, and religiosity. The EvA scale extends our understanding of individual differences in reasoning tendencies that shape critical attitudes, decisions, and behaviors and can help promote informed decisions.

Evaluation of decision-making behavior under uncertainty in capuchin monkeys (Sapajus apella) and humans (Homo sapiens) using a modified Balloon Analogue Risk Task.

Many animals, including humans, must make decisions when outcomes involve risk and/or ambiguity. To explore the evolutionary roots of decision making when outcomes are unknown, we modified the Balloon Analogue Risk Task (BART) for use with tufted capuchin monkeys (Sapajus [Cebus] apella), creating the Primate Analogue Risk Task (PART). Using both the BART and the PART, we first compared human performance across the two tasks using analogous parameters. Humans' performance on the two tasks was positively correlated. Next, we tested capuchin monkeys' performance on the PART to assess their decision-making strategies in the context of ambiguity. Secondarily, although it was not the main goal of the study, this allowed us to look at species differences between capuchins' and humans' performance. Finally, we investigated the influence of prior experience on human and capuchin decision-making behavior. Neither capuchins nor humans behaved differently following an unsuccessful trial compared to a successful trial. We found individual differences in capuchin monkeys' choice behavior, though as a whole they demonstrated a pattern of reward maximization over time. Finally, as a species, capuchins had lower PART risk scores than humans. This paradigm presents a useful way to assess behavior in a context with uncertain outcomes using a comparative approach. (PsycInfo Database Record (c) 2024 APA, all rights reserved).

Kreativnost i izvedba Simonova zadatka

The aim of this study was to examine performance in the Simon task regarding individual differences in creative behavior measured by The Inventory of Creative Activities and Achievements (ICAA; Diedrich et al., 2018). The study included 105 students and 57 younger working-age individuals (from 19 to 36 years of age). Three-way analyses of variance were carried out on the reaction time in the Simon task given the congruence of the previous and current trials and below/above average results on creative activities and achievements scales. The reaction time in the Simon task was on average shorter in congruent than in incongruent trials (the Simon effect), as well as in the trials preceded by congruent than in those preceded by incongruent trials. The Simon effect was only present in trials preceded by a congruent trial, while reaction times in the trials preceded by incongruent trials were shorter in incongruent than in congruent trials (the Gratton effect). However, neither the Simon nor the Gratton effect were more pronounced within more or less creative participants, but the participants with an above average result on the scale of creative activities reacted on average more slowly than individuals with below the average score. The correlations between the scores on the creativity measures and the different reaction times and indices of the Simon and Gratton effect were not significant. The expected effects related to the Simon task have been obtained in this study, but further research is needed to try to replicate the findings regarding the flexibility of inhibitory control measured by performance in the Simon task and creative behavior.

Effects of Habituation on Spatiotemporal Gait Measures in Younger Adults

Abstract Virtual reality (VR) has potential benefits for training and rehabilitation (Lei et al., 2019; Rutkowski et al., 2020). In some instances, understanding how performance in VR relates to performance in the real world is a necessary step in building effective environments. This study was designed to determine whether gait in VR changes over time (adaptation), and whether it approaches natural environment performance over time (habituation). Nineteen young adults walked over a gait mat in a real hallway for five minutes and a virtual hallway for three 10-minute blocks. Results indicated that gait was significantly different in the natural environment compared to the first five minutes of immersion (p < 0.05). Group averages also demonstrated that after 10–15 minutes of immersion, there was no statistical difference between the virtual and natural environments across any of the gait measures (p > 0.05). However, individual differences in gait behavior were also evident. While some participants matched performance between virtual and natural environments by the end of the 30-minute session, others did not. These findings provide evidence that individuals adapt differently to motor tasks in VR and suggest that when gait is required in VR, the environment may need to be tailored to the individual to achieve desired outcomes.

Game Behaviors among Adolescent MOBA Gamers in China: The Effects of Demographics, Trait Aggression, and Game Motivations

Abstract Game behaviors affect gamers’ psychological and behavioral development in real life. Previous studies have shown that demographic and basic personality traits are associated with game behaviors in massively multiplayer online role-playing games. However, little is known about the roles of trait aggression and game motivations, especially in multiplayer online battle arena games. Thus, the aim of this study was to investigate how demographic, trait aggression, and game motivations affect multiplayer online battle arena game behaviors. A total of 1,316 Chinese adolescent gamers who play Honor of Kings responded to questions related to demographic information, trait aggression, game motivations (socializer, competitor, escapist, story-driven, completionist, and smart-enhance), and game behaviors (aggressing, winning, creating, and helping). The multiple linear regression model results showed that males, socializers, completionists, and smart-enhance were more likely to exhibit aggressing, winning, creating, and helping behaviors. Trait aggression predicted aggressing, winning, and creating behaviors. Moreover, age and competitor scale positively predicted aggressing and winning behaviors. Meanwhile, escapists tended to engage in aggressing and creating behaviors, and story-driven players exhibited creating and helping behaviors. These results may be useful in explaining individual differences in game behaviors and the relationships between video-game and real-life behaviors for gamers.

Future of nature, our future. A preregistered report on future time perspective, social value orientation, and pro-environmental outcomes based on data from Poland and Sweden.

The objective of the study was to examine the role of social value orientation and future time perspective to account for individual differences in pro-environmental behaviors, intentions, and opinions about the link between pro-environmental action and pandemic threat (three separate models) in Polish and Swedish samples expected to differ in rate of pro-environmental behaviors (higher in Sweden). We hypothesized that for Poland, future time perspective would be linked to pro-environmental outcomes only when social value orientation is average or high. In contrast, for Sweden, we expected a significant link between these variables regardless of social value orientation. In total, 301 (150 Polish, 151 Swedish) participants completed online surveys via Prolific.co research panel. We controlled for individualizing/binding moral foundations, present time perspectives, and selected demographic variables in the analyses. In line with expectations, the individualizing moral foundations were a significant predictor across all three models. The data did not support our focal hypothesis regarding the interaction between future time perspective and social value orientation. For pro-environmental behaviors in the past 6 months, the future time perspective was a predictor only when social value orientation was low. The results suggest that when encouraging more competitive (compared to altruistic) people to behave in a green way, it might be crucial to underline the future consequences and benefits, consistent with the future time perspective. The pro-environmental campaigns could, therefore, highlight how green behavior may bring personal gains in the future, which are typically valued by individualistic people, such as savings or social status.

Determination of Behavioral Changes Associated with Bovine Respiratory Disease in Australian Feedlots

Accurately identifying bovine respiratory disease is challenging in feedlots, and previous studies suggest behavioral monitoring is important. The study objective was to describe individual differences in physical activity (distance traveled), feeding/watering patterns (proximity to feed and water), and social behavior (average cattle within 3 m) when associated with health status in commercially raised beef cattle during the first 28 days on feed. Data from a previous Australian feedlot study monitoring cattle behavior and associated health outcomes were analyzed. Health status categories were generated for all cattle, and each animal was categorized as known healthy (HLTH), known diseased (SICK), or intermediate/uncertain (INTR). The INTR animals were excluded from the final analysis. Key findings included: differentiation in activity between SICK (n = 138) and HLTH (n = 1508) cattle dependent on time of day, SICK cattle spending more time in water and feeding zones early in the feeding phase (<6 days on feed), SICK cattle spending more time in the water and feeding zone during the overnight hours, and SICK cattle spending more time in groups early in the feeding phase but more time in isolation after the first week on feed. Results illustrate behavioral data were associated with important health outcomes.

Impact of air-conditioning usage behavior of student groups on air-conditioning load simulation in university dormitories

During summers, air-conditioning (AC) accounts for a large proportion of the total energy consumption of university dormitory buildings, which is influenced by the occupant behavior. To quantitatively analyze the impact of the AC usage behavior of student groups on AC loads, this study regarded students as heterogeneous individuals, and classified them into four categories by taking group identity and individual preferred temperature as classification indicators, as follows: (i) low-group identity and low-preferred temperature, (ii) low-group identity and high-preferred temperature, (iii) high-group identity and low-preferred temperature, and (iv) high-group identity and high-preferred temperature. On this basis, a combined model composed of the student groups’ AC usage behavior simulation and the AC load calculation was developed. Results showed that the subject of low-group identity and low-preferred temperature was most sensitive to changes in indoor temperature. On a typical summer day, the AC load simulation results without considering differences in individual behavior increased by 9.7% compared with those considering differences in individual behavior, and the increased rate declined with the rise in outdoor temperature. Additionally, enhancing students’ group identity could significantly reduce AC loads.

The Relationship between Self-Control and Toxic Disinhibition Online Effects on Students Who Use Social Media

The emergence of the internet in the current era has transformed the paradigm of students in their interactions, learning, and even coordinating collective actions. The Internet provides convenience in the exchange of ideas and information, as well as facilitating fast, easy, and accessible communication for various segments of society. New forms of social interaction through the internet have enriched both personal and social life on a broader scale. However, despite the significant constructive potential of the internet, there is another aspect that needs attention. The internet has the potential to reinforce communication behaviors that are inappropriate, less suitable, or even unrestricted, often referred to as the "toxic disinhibition online effect" (Suler, 2004; Lapidot-lefler & Barak, 2012). When students interact in social media connected to the internet, they may exhibit signs of a lack of self-control, where a lack of understanding of relevant social signals and disregard for rules and barriers in online interactions become the main factors in the emergence of this effect. This finding is reinforced by Joinson's research (2004), which revealed differences in individual behavior in the online and offline worlds, even in similar situations. This research was conducted to explore the relationship between the level of self-control and the "toxic disinhibition online" effect on students who actively use social media. Measurement was carried out using the Toxic disinhibition online effect scale and the Self-control scale. The research involved 154 student respondents, with the majority (86%) of them being female. A total of 50.6% of the respondents had a high level of self-control. However, the results of statistical analysis showed that there was no significant relationship between self-control and the "toxic disinhibition online" effect (p = 0.604, r = -0.042), with the significance value exceeding the 95% confidence level. In conclusion, this research did not find a significant relationship between self-control and the "toxic disinhibition online" effect among students using social media. These findings provide additional insights into student online behavior and its implications for self-control in the digital context. All of these findings contribute to understanding the role of the internet in the development of social and individual behavior in the digital age.