Recursive versus recursively enumerable binary relations

The properties of antisymmetry and linearity are easily seen to be sufficient for a recursively enumerable binary relation to be recursively isomorphic to a recursive relation. Removing either condition allows for the existence of a structure where no recursive isomorph exists, and natural examples of such structures are surveyed.     

The role of impulse variability in manual-aiming asymmetries

Summary Two experiments are reported in which we examined the hypothesis that the advantage of the right hand in target aiming arises from differences in impulse variability. Subjects made aiming movements with the left and right hands. The force requirements of the movements were manipulated through the addition of mass to the limb (Experiments 1 and 2) and through control of movement amplitude (Experiment 1). Although the addition of mass diminished performance (i. e., it increased movement times in Experiment 1 and increased error in Experiment 2), the two hands were not differently affected by the manipulation of required force. In spite of the fact that the right hand exhibited enhanced performance (i. e., lower movement times in Experiment 1 and greater accuracy in Experiment 2), these advantages were not reflected in kinematic measures of impulse variability.We are grateful to an anonymous reviewer for clarification of this distinction.     

Self-Esteem, Self-Handicapping, and Self-Presentation: The Strategy of Inadequate Practice

ABSTRACT In two experiments we investigated the causes of low preparatory effort (minimal practicing for an upcoming event that is to be evaluated), a possible form of self-handicapping Experiment 1 found that people with high self-esteem practiced less than people with low self-esteem, although a prior experience of success eliminated this difference Experiment 2 showed that people with high self-esteem practiced less only when the practice duration was publicly known, indicating that they were using a strategic self-presentational ploy rather man responding to superior confidence This difference may reflect a desire to maximize the self-presentation of high ability by appearing to succeed despite minimal preparatory effort These results suggest that this form of self-handicapping is a strategy used by highly confident individuals in uncertain situations to make a favorable impression on others     

Investigating the influence of an effort–reward interaction on cognitive fatigue in individuals with multiple sclerosis

This study examined whether an alteration in the effort–reward relationship, a theoretical framework based on cognitive neuroscience, could explain cognitive fatigue. Forty persons with MS and 40 healthy age- and education-matched cognitively healthy controls (HC) participated in a computerized switching task with orthogonal high- and low-demand (effort) and reward manipulations. We used the Visual Analog Scale of Fatigue (VAS-F) to assess subjective state fatigue before and after each condition during the task. We used mixed-effects models to estimate the association and interaction between effort and reward and their relationship to subjective fatigue and task performance. We found the high-demand condition was associated with increased VAS-F scores (p < .001), longer response times (RT) (p < .001) and lower accuracy (p < .001). The high-reward condition was associated with faster RT (p = .006) and higher accuracy (p = .03). There was no interaction effect between effort and reward on VAS-F scores or performance. Participants with MS reported higher VAS-F scores (p = .02). Across all conditions, participants with MS were slower (p < .001) and slower as a function of condition demand compared with HC (p < .001). This behavioural study did not find evidence that an effort–reward interaction is associated with cognitive fatigue. However, our findings support the role of effort in subjective cognitive fatigue and both effort and reward on task performance. In future studies, more salient reward manipulations could be necessary to identify effort–reward interactions on subjective cognitive fatigue.     

Haitian and Haitian American experiences of racism and socioethnic discrimination in Miami-Dade county: At-risk and court-involved youth

We examine how juvenile justice-involved youth of Haitian descent in Miami-Dade County cope with structural racism and its impact on their mental health. Drawing on longitudinal ethnography, psychosocial assessment data, and a family-based clinical intervention funded by the National Institute on Drug Abuse, this article explores youth narratives of discrimination prior to and during the COVID-19 pandemic. We use critical race theory and theory of practice to understand youths’ perceptions as racialized bodies and stigmatized selves, highlighting the experiences and perspectives of a particular black immigrant group, ethnic beings caught up in the everyday practices of racialization, sociocultural marginalization, and racism. We frame these experiences as a variation of the complex continuum of structural racism and racial domination in the US. These experiences have caused anger, fear, anxiety, chronic anticipatory distress, and hopelessness among youth of Haitian descent. We conclude with some recommendations for therapeutic support that encourages youth to process their experiences, promotes their development of a positive self-concept, and provides them with mind-body techniques to attenuate the physical impacts of discriminatory events. The clinical trial registration number for this study intervention is NCT03876171.     

Depressive symptoms and conspiracy beliefs

Conspiratorial beliefs can endanger individuals and societies by increasing the likelihood of harmful behaviors such as the flouting of public health guidelines. While scholars have identified various correlates of conspiracy beliefs, one factor that has received scant attention is depressive symptoms. We use three large surveys to explore the connection between depression and conspiracy beliefs. We find a consistent association, with the extent of the relationship depending on individual and situational factors. Interestingly, those from relatively advantaged demographic groups (i.e., White, male, high income, educated) exhibit a stronger relationship between depression and conspiracy beliefs than those not from such groups. Furthermore, situational variables that ostensibly increase stress—such as having COVID-19 or parenting during COVID-19—exacerbate the relationship while those that seem to decrease stress, such as social support, vitiate it. The results provide insight about the development of targeted interventions and accentuate the need for theorizing about the mechanisms that lead depression to correlate with conspiracy beliefs.     

Casting weight goal as a function of weight status among a representative population-based sample of adolescents

This paper pursues two objectives: (1) to estimate proportions of adolescents with a weight goal that matched and mismatched weight status, and (2) to identify correlates of a mismatched weight goal. Data were from a representative population-based sample of adolescents (n = 2346, 51% female; 91.5% complete data). Results showed that 69% of adolescents had a weight goal that matched weight status whereas 31% had a weight goal that mismatched weight status. Body dissatisfaction was a significant predictor of having a mismatched weight goal for both sexes while elevated psychological distress was a predictor among girls. Being body dissatisfied mediated the association between psychological distress and having a mismatched weight goal among girls. Casting weight goal as a function of weight status may allow for a better understanding of overall weight management strategies.     

Cultural Intersection of Asian Indian Ethnicity and Presenting Problem: Adapting Multicultural Competence for Clinical Accessibility

A more accessible approach to using multicultural counseling competence is presented to bridge the researcher‐practitioner gap and increase the likelihood of quality clinical services. The focus of the approach is on counselor awareness, knowledge, and skills as they relate to the most important contextualing factors: ethnic culture and the culture of the presenting problem. Se presenta una aproximación más accesible al uso de la competencia multicultural en consejería para zanjar la brecha entre investigadores y profesionales clínicos y también para incrementar las probabilidad de que los servicios clínicos sean de calidad. El enfoque de la aproximación es hacia la conciencia, conocimientos y habilidades del consejero en relación a los factores contextuales más importantes: la cultura étnica y la cultura del problema inicial.     

EQUIVALENCE CLASS FORMATION: A METHOD FOR TEACHING STATISTICAL INTERACTIONS

Many students struggle with statistical concepts such as interaction. In an experimental group, participants took a paper‐and‐pencil test and then were given training to establish equivalent classes containing four different statistical interactions. All participants formed the equivalence classes and showed maintenance when probes contained novel negative exemplars. Thereafter, participants took a second paper‐and‐pencil test. Participants in the control group received two versions of the paper‐and‐pencil test without equivalence‐based instruction. All participants in the experimental group showed increased paper‐and‐pencil test scores after forming the interaction‐indicative equivalence classes. Class‐indicative responding also generalized to novel exemplars and the novel question format used in the paper‐and‐pencil test. Test scores did not change with repetition for control group participants. Implications for behavioral diagnostics and teaching technology are discussed.