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Gettysburg College

Psychology Faculty Publications

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Full-Text Articles in Social and Behavioral Sciences

Individual Differences In Social Play Behaviour Predict Alcohol Intake And Control Over Alcohol Seeking In Rats, Heidi M. B. Lesscher, E. J. Marijke Achterberg, Stephen M. Siviy, Louk J. M. J. Vanderschuren Aug 2021

Individual Differences In Social Play Behaviour Predict Alcohol Intake And Control Over Alcohol Seeking In Rats, Heidi M. B. Lesscher, E. J. Marijke Achterberg, Stephen M. Siviy, Louk J. M. J. Vanderschuren

Psychology Faculty Publications

Rationale

Social play behaviour is a rewarding social activity displayed by young mammals, thought to be important for the development of brain and behaviour. Indeed, disruptions of social play behaviour in rodents have been associated with cognitive deficits and augmented sensitivity to self-administration of substances of abuse, including alcohol, later in life. However, the relation between social development and loss of control over substance use, a key characteristic of substance use disorders including alcohol use disorder (AUD), has not been investigated. Moreover, it remains unknown how inherent differences in playfulness relate to differences in the sensitivity to substance use and …


What Shall We Call God? An Exploration Of Metaphors Coded From Descriptions Of God From A Large U.S. Undergraduate Sample, Adam K. Fetterman, Nicholas D. Evans, Julie J. Exline, Brian P. Meier Jul 2021

What Shall We Call God? An Exploration Of Metaphors Coded From Descriptions Of God From A Large U.S. Undergraduate Sample, Adam K. Fetterman, Nicholas D. Evans, Julie J. Exline, Brian P. Meier

Psychology Faculty Publications

People use numerous metaphors to describe God. God is seen as a bearded man, light, and love. Based on metaphor theories, the metaphors people use to refer to God reflect how people think about God and could, in turn, reflect their worldview. However, little work has explored the common metaphors for God. This was the purpose of the current investigation. Four trained raters coded open-ended responses from predominantly Christian U.S. undergraduates (N = 2,923) describing God for the presence or absence of numerous metaphoric categories. We then assessed the frequency of each of the metaphor categories. We identified 16 metaphor …


Examining The Influence Of Cosmetics On Jury Decisions., Carlota Batres, Richard Russell Aug 2020

Examining The Influence Of Cosmetics On Jury Decisions., Carlota Batres, Richard Russell

Psychology Faculty Publications

Many studies have examined how defendant characteristics influence jury decisions, but none have investigated the effect of cosmetics. We therefore examined how cosmetics influence jury decisions for young and middle-aged female defendants. In Study 1, participants were more likely to assign guilty verdicts to middle-aged defendants than young defendants and when presented with cosmetics, male participants gave young defendants longer sentences and middle-aged defendants shorter sentences. In Study 2, however, we did not replicate the age or the cosmetics effects on jury sentences, suggesting that comparisons between defendants may have influenced jury decisions in Study 1. Further work is thus …


A Role For Contrast Gain Control In Skin Appearance, Richard Russell, Carlota Batres, Alex L. Jones, Aurélie Porcheron Nov 2019

A Role For Contrast Gain Control In Skin Appearance, Richard Russell, Carlota Batres, Alex L. Jones, Aurélie Porcheron

Psychology Faculty Publications

Apparent contrast can be suppressed or enhanced when presented within surrounding images. This contextual modulation is typically accounted for with models of contrast gain control. Similarly, the appearance of one part of a face is affected by the appearance of the other parts of the face. These influences are typically accounted for with models of face-specific holistic processing. Here we report evidence that facial skin appearance is modulated by adjacent surfaces. In four experiments we measured the appearance of skin evenness and wrinkles in images with increased or decreased contrast between facial skin and adjacent image regions. Increased contrast with …


The Path To God Is Through The Heart: Metaphoric Self-Location As A Predictor Of Religiosity, Adam K. Fetterman, Jacob Juhl, Brian P. Meier, Andrew Abeyta, Clay Routledge, Michael D. Robinson Aug 2019

The Path To God Is Through The Heart: Metaphoric Self-Location As A Predictor Of Religiosity, Adam K. Fetterman, Jacob Juhl, Brian P. Meier, Andrew Abeyta, Clay Routledge, Michael D. Robinson

Psychology Faculty Publications

Metaphors linking the heart to warm intuition and the head to cold rationality may capture important differences between people because some locate the self in the heart and others locate the self in the head. Five studies (total N = 2575) link these individual differences to religious beliefs. Study 1 found that religious beliefs were stronger among heart-locators than head-locators. Studies 2 and 3 replicated this relationship in more diverse samples. Studies 4 and 5 focused on questions of mediation. Heart-locators believed in God to a greater extent partly because of empathy-related processes (Study 4) and partly because they tended …


Naturally Better? A Review Of The Natural‐Is‐Better Bias, Brian P. Meier, Amanda J. Dillard, Courtney M. Lappas Jul 2019

Naturally Better? A Review Of The Natural‐Is‐Better Bias, Brian P. Meier, Amanda J. Dillard, Courtney M. Lappas

Psychology Faculty Publications

People are frequently exposed to products and services that are labeled natural (e.g., Nature Made Vitamins or GoJo Natural Orange Hand Cleaner). The frequency with which this label is used suggests that it delivers an advantage in marketing and sales. Our review examines the preference for and perception of naturalness and reveals that people have a bias for items described as natural in many domains including foods, medicine, beauty products, cigarettes, and lighting. These preferences abound even when the natural item is identical or not objectively better than the non‐natural or synthetic item. We believe this bias may be driven …


Basal Ganglia Involvement In The Playfulness Of Juvenile Rats, Stephen M. Siviy Jun 2019

Basal Ganglia Involvement In The Playfulness Of Juvenile Rats, Stephen M. Siviy

Psychology Faculty Publications

Play is an important part of normal childhood development and can be readily studied in the laboratory rat in the form of rough‐and‐tumble play. Given the robust nature of rough‐and‐tumble play, it has often been assumed that the basal ganglia would have a prominent role in modulating this behavior. Recent work using c‐fos expression as a metabolic marker for neural activity combined with temporary inactivation of relevant corticostriatal regions and pharmacological manipulations of opioid, cannabinoid, and dopamine systems has led to a better understanding of how basal ganglia circuitry may be involved in modulating social play in the juvenile rat. …


Cosmetics Increase Skin Evenness: Evidence From Perceptual And Physical Measures, Carlota Batres, Aurélie Porcheron, Julie Latreille, Magalie Roche, Frédérique Morizot, Richard Russell May 2019

Cosmetics Increase Skin Evenness: Evidence From Perceptual And Physical Measures, Carlota Batres, Aurélie Porcheron, Julie Latreille, Magalie Roche, Frédérique Morizot, Richard Russell

Psychology Faculty Publications

Background

Cosmetics are commonly attributed with increasing skin evenness, yet little published data characterizes the effect, either perceptually or physically. We therefore investigated whether makeup increases skin evenness using a perceptual measurement and two physical measurements of color and luminance homogeneity.

Materials and Methods

Twenty‐two French women (aged 29‐45 years) were photographed without cosmetics, with self‐applied cosmetics, and with professionally‐applied cosmetics. In Study 1, 143 participants rated skin evenness. In Study 2, each face was delineated to create regions of interest (ROI) in the cheek and forehead areas. Both ROIs were then analyzed for luminance homogeneity using an established measure …


Examining The ‘Cosmetics Placebo Effect’, Carlota Batres, Sarah S. Kramer, Caroline G. Deangelis, Richard Russell Jan 2019

Examining The ‘Cosmetics Placebo Effect’, Carlota Batres, Sarah S. Kramer, Caroline G. Deangelis, Richard Russell

Psychology Faculty Publications

Previous studies have found a positive effect of cosmetics on certain behavioral measures, such as the tip given to waitresses by male patrons. These studies have employed confederates who usually wear cosmetics. We therefore sought to examine whether the positive effect found in these studies could, in part, be explained by a change in behavior. In order to test the possibility of a ‘cosmetics placebo effect’, we employed a confederate to solicit donations from passersby. On some days our confederate would not have any cosmetics applied to her face (i.e., no cosmetics condition), on some days cosmetics were pretended to …


Lexical Derivation Of The Pint Taxonomy Of Goals: Prominence, Inclusiveness, Negativity Prevention, And Tradition, Benjamin M. Wilkowski, Adam Fetterman, Shaun K. Lappi, Laverl Z. Williamson, Elizabeth Ferguson Leki, Emilio Rivera, Brian P. Meier Jan 2019

Lexical Derivation Of The Pint Taxonomy Of Goals: Prominence, Inclusiveness, Negativity Prevention, And Tradition, Benjamin M. Wilkowski, Adam Fetterman, Shaun K. Lappi, Laverl Z. Williamson, Elizabeth Ferguson Leki, Emilio Rivera, Brian P. Meier

Psychology Faculty Publications

What do people want? Few questions are more fundamental to psychological science than this. Yet, existing taxonomies disagree on both the number and content of goals. We thus adopted a lexical approach and investigated the structure of goal-relevant words from the natural English lexicon. Through an intensive rating process, 1,060 goal-relevant English words were first located. In Studies 1-2, two relatively large and diverse samples (total n = 1,026) rated their commitment to approaching or avoiding these goals. Principal component analyses yielded 4 replicable components: Prominence, Inclusiveness, Negativity prevention, and Tradition (the PINT Taxonomy). Study 3-7 (total n = 1,396) …


A Behavioral Confirmation And Reduction Of The Natural Versus Synthetic Drug Bias, Brian P. Meier, Amanda J. Dillard, Eric S. Osorio, Courtney M. Lappas Jan 2019

A Behavioral Confirmation And Reduction Of The Natural Versus Synthetic Drug Bias, Brian P. Meier, Amanda J. Dillard, Eric S. Osorio, Courtney M. Lappas

Psychology Faculty Publications

Research reveals a biased preference for natural versus synthetic drugs; however, this research is based upon self-report and has not examined ways to reduce the bias. We examined these issues in five studies involving 1,125 participants. In a Pilot Study (N = 110), participants rated the term natural to be more positive than the term synthetic, which reveals a default natural-is-better belief. In Studies 1 (N = 109) and 2 (N = 100), after a supposed personality study, participants were offered a thank you “gift” of a natural or synthetic pain reliever. Approximately 86% (Study 1) and 93% (Study 2) …


What You Don't Know About Motivational Laptop Stickers, Cindy J. Campoverde-Reinoso, Stella Nicolaou, Kathy R. Berenson Oct 2018

What You Don't Know About Motivational Laptop Stickers, Cindy J. Campoverde-Reinoso, Stella Nicolaou, Kathy R. Berenson

Psychology Faculty Publications

Mental health problems are on the rise among young adults in the U.S. (Kingkade, 2016). At the same time, today’s U.S. young adults are significantly more invested than their older counterparts in portraying themselves as “positive” (self-confident, easy-going, and happy; Berenson et al., 2018). Although many have begun to speculate that these two trends may be linked (e.g., Fagan, 2017), little empirical research on this issue exists.


Evidence That The Hormonal Contraceptive Pill Is Associated With Cosmetic Habits, Carlota Batres, Aurélie Porcheron, Gwenaël Kaminski, Sandra Courrèges, Frédérique Morizot, Richard Russell Aug 2018

Evidence That The Hormonal Contraceptive Pill Is Associated With Cosmetic Habits, Carlota Batres, Aurélie Porcheron, Gwenaël Kaminski, Sandra Courrèges, Frédérique Morizot, Richard Russell

Psychology Faculty Publications

Hormonal contraception is known to cause subtle but widespread behavioral changes. Here, we investigated whether changes in cosmetic habits are associated with use of the hormonal contraceptive pill. We photographed a sample of women (N = 36) who self-reported whether or not they use the contraceptive pill, as well as their cosmetic habits. A separate sample of participants (N = 143) rated how much makeup these target women appeared to be wearing. We found that women not using the contraceptive pill (i.e., naturally cycling women) reported spending more time applying cosmetics for an outing than did women who …


A Weight–Related Growth Mindset Increases Negative Attitudes Towards Obese People, Nic Hooper, Alison Crumpton, Michael D. Robinson, Brian P. Meier Aug 2018

A Weight–Related Growth Mindset Increases Negative Attitudes Towards Obese People, Nic Hooper, Alison Crumpton, Michael D. Robinson, Brian P. Meier

Psychology Faculty Publications

In implicit personality theory, people with entity views or a fixed mindset perceive characteristics (e.g., intelligence) as uncontrollable, whereas people with incremental views or a growth mindset perceive characteristics as controllable. In addition to other benefits, the literature sometimes suggests that having a growth mindset will protect against prejudice, which the current two studies examine in terms of negative attitudes towards obese people. Participants (total N = 501) were randomly assigned to complete a questionnaire assessing attitudes towards an obese or non-obese person and a self-theory questionnaire also assessed ideas about body weight. People with a growth mindset, and not …


Age, Gender, And Socioeconomic Status Differences In Explicit And Implicit Beliefs About Effortlessly Perfect Self-Presentation, Kathy R. Berenson, Tess M. Anderson, Jill Glazer, Melissa P. Menna, Huilin Xu Apr 2018

Age, Gender, And Socioeconomic Status Differences In Explicit And Implicit Beliefs About Effortlessly Perfect Self-Presentation, Kathy R. Berenson, Tess M. Anderson, Jill Glazer, Melissa P. Menna, Huilin Xu

Psychology Faculty Publications

Feeling pressure to project an image of effortless perfection -- always appearing to perform with self-confidence and ease --- has been portrayed in the media as an increasingly common mental health vulnerability with potentially serious implications for college women. Despite this, almost no empirical research exists on effortlessly perfect self–presentation (EPSP) or demographic differences in it.

• Some recent research suggests that perfectionism is on the rise among young people (Curran & Hill, 2017), and that it is more associated with mental health problems among students with high rather than low socioeconomic status (Lyman & Luthar, 2014). However, these studies …


Development And Validation Of The Single Item Trait Empathy Scale (Sites), Sara Konrath, Brian P. Meier, Brad J. Bushman Apr 2018

Development And Validation Of The Single Item Trait Empathy Scale (Sites), Sara Konrath, Brian P. Meier, Brad J. Bushman

Psychology Faculty Publications

Empathy involves feeling compassion for others and imagining how they feel. In this article, we develop and validate the Single Item Trait Empathy Scale (SITES), which contains only one item that takes seconds to complete. In seven studies (N = 5724), the SITES was found to be both reliable and valid. It correlated in expected ways with a wide variety of intrapersonal outcomes. For example, it is negatively correlated with narcissism, depression, anxiety, and alexithymia. In contrast, it is positively correlated with other measures of empathy, self-esteem, subjective well-being, and agreeableness. The SITES also correlates with a wide variety of …


Do We See Eye To Eye? Moderators Of Correspondence Between Student And Faculty Evaluations Of Day-To-Day Teaching, Kathleen M. Cain, Benjamin M. Wilkowski, Christopher P. Barlett, Colleen D. Boyle, Brian P. Meier Mar 2018

Do We See Eye To Eye? Moderators Of Correspondence Between Student And Faculty Evaluations Of Day-To-Day Teaching, Kathleen M. Cain, Benjamin M. Wilkowski, Christopher P. Barlett, Colleen D. Boyle, Brian P. Meier

Psychology Faculty Publications

Students and instructors show moderate levels of agreement about the quality of day-to-day teaching. In the present study, we replicated and extended this finding by asking how correspondence between student and instructor ratings is moderated by time of semester and student demographic variables. Participants included 137 students and 5 instructors. On 10 separate days, students and instructors rated teaching effectiveness and challenge level of the material. Multilevel modeling indicated that student and instructor ratings of teaching effectiveness converged overall, but more advanced students and Caucasian students converged more closely with instructors. Student and instructor ratings of challenge converged early but …


Effects Of Neonatal Handling On Play And Anxiety In F344 And Lewis Rats, Stephen M. Siviy Mar 2018

Effects Of Neonatal Handling On Play And Anxiety In F344 And Lewis Rats, Stephen M. Siviy

Psychology Faculty Publications

Play is an important part of normal childhood development and seen in many mammals, including rats. To better understand the interplay between genotype and postnatal experiences, the effects of neonatal handling on play were assessed in Lewis (LEW) and Fischer 344 (F344) rats. Handled litters experienced brief periods of separation during the first two postnatal weeks. F344 rats were less likely to direct nape contacts toward an untreated Sprague–Dawley (SD) partner and less likely to rotate to a supine position in response to a nape contact. When compared to rats from control litters, handled LEW, and F344 rats were more …


Borderline Personality Features And Integration Of Positive And Negative Thoughts About Significant Others, Kathy R. Berenson, Jessica C. Johnson, Fanghui Zhao, Olga U.A. Nynaes, Tamir Goren Jan 2018

Borderline Personality Features And Integration Of Positive And Negative Thoughts About Significant Others, Kathy R. Berenson, Jessica C. Johnson, Fanghui Zhao, Olga U.A. Nynaes, Tamir Goren

Psychology Faculty Publications

Taking the bad with the good is a necessity of life, and people who readily integrate thoughts of their loved one’s flaws with thoughts of their more positive attributes maintain more stable, satisfying relationships. Borderline personality disorder, however, is often characterized by interpersonal perceptions that fluctuate between extremes of good and bad. We used a timed judgment task to examine information processing about significant others in individuals high in borderline personality features relative to healthy individuals and those high in avoidant personality features. In Study 1, when judging traits of a liked significant other, same-valence facilitation by negative primes (judging …


Identification Of Mental States And Interpersonal Functioning In Borderline Personality Disorder, Kathy R. Berenson, Cara L. Dochat, Christiana G. Martin, Xiao Yang, Eshkol Rafaeli, Geraldine Downey Jan 2018

Identification Of Mental States And Interpersonal Functioning In Borderline Personality Disorder, Kathy R. Berenson, Cara L. Dochat, Christiana G. Martin, Xiao Yang, Eshkol Rafaeli, Geraldine Downey

Psychology Faculty Publications

Atypical identification of mental states in the self and others has been proposed to underlie interpersonal difficulties in borderline personality disorder (BPD), yet no previous empirical research has directly examined associations between these constructs. We examine 3 mental state identification measures and their associations with experience-sampling measures of interpersonal functioning in participants with BPD relative to a healthy comparison (HC) group. We also included a clinical comparison group diagnosed with avoidant personality disorder (APD) to test the specificity of this constellation of difficulties to BPD. When categorizing blended emotional expressions, the BPD group identified anger at a lower threshold than …


Makeup Changes The Apparent Size Of Facial Features, Alex L. Jones, Aurélie Porcheron, Richard Russell Jan 2018

Makeup Changes The Apparent Size Of Facial Features, Alex L. Jones, Aurélie Porcheron, Richard Russell

Psychology Faculty Publications

Makeup is a prominent example of the universal human practice of personal decoration. Many studies have shown that makeup makes the face appear more beautiful, but the visual cues mediating this effect are not well understood. A widespread belief holds that makeup makes the facial features appear larger. We tested this hypothesis using a novel reference comparison paradigm, in which carefully controlled photographs of faces with and without makeup were compared with an average reference face. Participants compared the relative size of specific features (eyebrows, eyes, nose, mouth) of the reference face and individual faces with or without makeup. Across …


Attributions For Rejection And Acceptance In Young Adults With Borderline And Avoidant Personality Features, Kathy R. Berenson, Olga U.A. Nynaes, Emily S. Wakschal, Laura M. Kapner, Erin C. Sweeney Jan 2018

Attributions For Rejection And Acceptance In Young Adults With Borderline And Avoidant Personality Features, Kathy R. Berenson, Olga U.A. Nynaes, Emily S. Wakschal, Laura M. Kapner, Erin C. Sweeney

Psychology Faculty Publications

Individuals with borderline and avoidant personality disorders show interpersonal dysfunction that includes maladaptive responses to rejection and reduced emotional benefits from acceptance. To identify the attributional styles that may underlie these difficulties, we examined causal attributions for rejection and acceptance among undergraduates high in features of each disorder and a healthy comparison group. In Study 1, participants rated how likely they were to attribute hypothetical rejection and acceptance experiences to positive and negative qualities of the self and others, as well as external circumstances. In Study 2, we examined these same attributions in daily diary assessments of real rejection and …


Age Differences In The Desirability Of Narcissism, Kathy R. Berenson, William D. Ellison, Rachel L. Clasing Nov 2017

Age Differences In The Desirability Of Narcissism, Kathy R. Berenson, William D. Ellison, Rachel L. Clasing

Psychology Faculty Publications

Young adult narcissism has been the focus of much discussion in the personality literature and popular press. Yet no previous studies have addressed whether there are age differences in the relative desirability of narcissistic and non-narcissistic self-descriptions, such as those presented as answer choices on the Narcissistic Personality Inventory (NPI; Raskin & Hall, 1979). In Study 1, younger age was associated with less negative evaluations of narcissistic (vs. non-narcissistic) statements in general, and more positive evaluations of narcissistic statements conveying leadership/authority. In Study 2, age was unrelated to perceiving a fictional target person as narcissistic, but younger age was associated …


Self-Compassion, Self-Injury, And Pain, Wesley Ellen Gregory, Jillian V. Glazer, Kathy R. Berenson Oct 2017

Self-Compassion, Self-Injury, And Pain, Wesley Ellen Gregory, Jillian V. Glazer, Kathy R. Berenson

Psychology Faculty Publications

We conducted an experiment to examine self-compassion and responses to pain among undergraduate women with and without histories of self-injury. After a writing task that has been shown to increase self-compassion in a values-affirming condition relative to a neutral control condition, participants completed a self-report measure of state self-compassion and the cold pressor task. As predicted, participants with a history of self-injury reported lower trait self-compassion than those without such a history, and participants in the values-affirming condition reported significantly higher state self-compassion than those in the control condition. Moreover, participants with a history of self-injury demonstrated significantly less insensitivity …


Positive Facial Affect Looks Healthy, Alex L. Jones, Carlota Batres, Aurélie Porcheron, Jennifer R. Sweda, Frédérique Morizot, Richard Russell Sep 2017

Positive Facial Affect Looks Healthy, Alex L. Jones, Carlota Batres, Aurélie Porcheron, Jennifer R. Sweda, Frédérique Morizot, Richard Russell

Psychology Faculty Publications

A healthy appearance is linked to important behavioural outcomes. Here we investigated whether positive facial affect is a cue for perceived health. In study one, two groups of participants rated the perceived health or perceived happiness of a large set of faces with neutral expressions. Perceived happiness predicted perceived health, as did anthropometric measures of expression. In a second experimental study, we collected ratings of perceived health for a wide age range of target faces with either neutral or smiling expressions. Smiling faces were rated as being much healthier looking than neutral faces, confirming that facial expression plays a role …


Facial Contrast Is A Cross-Cultural Cue For Perceiving Age, Aurélie Porcheron, Emmanuelle Mauger, Frédérique Soppelsa, Yuli Liu, Liezhong Ge, Olivier Pascalis, Richard Russell, Frédérique Morizot Jul 2017

Facial Contrast Is A Cross-Cultural Cue For Perceiving Age, Aurélie Porcheron, Emmanuelle Mauger, Frédérique Soppelsa, Yuli Liu, Liezhong Ge, Olivier Pascalis, Richard Russell, Frédérique Morizot

Psychology Faculty Publications

Age is a fundamental social dimension and a youthful appearance is of importance for many individuals, perhaps because it is a relevant predictor of aspects of health, facial attractiveness and general well-being. We recently showed that facial contrast—the color and luminance difference between facial features and the surrounding skin—is age-related and a cue to age perception of Caucasian women. Specifically, aspects of facial contrast decrease with age in Caucasian women, and Caucasian female faces with higher contrast look younger (Porcheron et al., 2013). Here we investigated faces of other ethnic groups and raters of other cultures to see …


Impulsivity, Rejection Sensitivity, And Reactions To Stressors In Borderline Personality Disorder, Kathy R. Berenson, Wesley Ellen Gregory, Erin Glaser, Aliza Romirowsky, Eshkol Rafaeli, Xiao Yang, Geraldine Downey Aug 2016

Impulsivity, Rejection Sensitivity, And Reactions To Stressors In Borderline Personality Disorder, Kathy R. Berenson, Wesley Ellen Gregory, Erin Glaser, Aliza Romirowsky, Eshkol Rafaeli, Xiao Yang, Geraldine Downey

Psychology Faculty Publications

This research investigated baseline impulsivity, rejection sensitivity, and reactions to stressors in individuals with borderline personality disorder compared to healthy individuals and those with avoidant personality disorder . The borderline group showed greater impulsivity than the avoidant and healthy groups both in a delay-discounting task with real monetary rewards and in self-reported reactions to stressors; moreover, these findings could not be explained by co-occurring substance use disorders. Distress reactions to stressors were equally elevated in both personality disorder groups (relative to the healthy group). The borderline and avoidant groups also reported more maladaptive reactions to a stressor of an interpersonal …


A Brain Motivated To Play: Insights Into The Neurobiology Of Playfulness, Stephen M. Siviy Apr 2016

A Brain Motivated To Play: Insights Into The Neurobiology Of Playfulness, Stephen M. Siviy

Psychology Faculty Publications

Play is an important part of normal childhood development and is seen in varied forms among many mammals. While not indispensable to normal development, playful social experiences as juveniles may provide an opportunity to develop flexible behavioural strategies when novel and uncertain situations arise as an adult. To understand the neurobiological mechanisms responsible for play and how the functions of play may relate to these neural substrates, the rat has become the model of choice. Play in the rat is easily quantified, tightly regulated, and can be modulated by genetic factors and postnatal experiences. Brain areas most likely to be …


Bah Humbug: Unexpected Christmas Cards And The Reciprocity Norm, Brian P. Meier Jan 2016

Bah Humbug: Unexpected Christmas Cards And The Reciprocity Norm, Brian P. Meier

Psychology Faculty Publications

The reciprocity norm refers to the expectation that people will help those who helped them. A well-known study revealed that the norm is strong with Christmas cards, with 20% of people reciprocating a Christmas card received from a stranger. I attempted to conceptually replicate and extend this effect. In Study 1, 755 participants received a Christmas card supposedly from a more- versus less-similar stranger. The reciprocation rate was unexpectedly low (2%), which did not allow for a test of a similarity effect. Two potential reasons for this low rate were examined in Study 2 in which 494 participants reported their …


The Influence Of Safety, Efficacy, And Medical Condition Severity On Natural V. Synthetic Drug Preference, Brian P. Meier, Courtney M. Lappas Jan 2016

The Influence Of Safety, Efficacy, And Medical Condition Severity On Natural V. Synthetic Drug Preference, Brian P. Meier, Courtney M. Lappas

Psychology Faculty Publications

Research indicates that there is a preference for natural v. synthetic products, but the influence of this preference on drug choice in the medical domain is largely unknown. We present 5 studies in which participants were asked to consider a hypothetical situation in which they had a medical issue requiring pharmacological therapy. Participants ( N = 1223) were asked to select a natural, plant-derived, or synthetic drug. In studies 1a and 1b, approximately 79% of participants selected the natural v. synthetic drug, even though the safety and efficacy of the drugs were identical. Furthermore, participants rated the natural drug as …