Domesticated dogs’ (Canis familiaris) use of the solidity principle

Organisms must often make predictions about the trajectories of moving objects. However, often these objects become hidden. To later locate such objects, the organism must maintain a representation of the object in memory and generate an expectation about where it will later appear. We explored adult dogs’ knowledge and use of the solidity principle (that one solid object cannot pass through another solid object) by evaluating search behavior. Subjects watched as a treat rolled down an inclined tube into a box. The box either did or did not contain a solid wall dividing it in half. To find the treat, subjects had to modify their search behavior based on the presence or absence of the wall, which either did or did not block the treat’s trajectory. Dogs correctly searched the near location when the barrier was present and the far location when the barrier was absent. They displayed this behavior from the first trial, as well as performed correctly when trial types were intermingled. These results suggest that dogs direct their searches in accordance with the solidity principle.     

The Embodied God: Core Intuitions About Person Physicality Coexist and Interfere With Acquired Christian Beliefs About God,the Holy Spirit,and Jesus

Why are disembodied extraordinary beings like gods and spirits prevalent in past and present theologies? Under the intuitive Cartesian dualism hypothesis, this is because it is natural to conceptualize of minds as separate from bodies; under the counterintuitiveness hypothesis, this is because beliefs in minds without bodies are unnatural—such beliefs violate core knowledge intuitions about person physicality and consequently have a social transmission advantage. We report on a critical test of these contrasting hypotheses. Prior research found that among adult Christian religious adherents, intuitions about person psychology coexist and interfere with theological conceptualizations of God (e.g., infallibility). Here, we use a sentence verification paradigm where participants are asked to evaluate as true or false statements on which core knowledge intuitions about person physicality and psychology and Christian theology about God are inconsistent (true on one and false on the other) versus consistent (both true or both false). We find, as predicted by the counterintuitiveness hypothesis but not the Cartesian dualism hypothesis, that Christian religious adherents show worse performance (lower accuracy and slower response time) on statements where Christian theological doctrines about God's physicality (e.g., incorporeality, omnipresence) conflict with intuitions about person physicality. We find these effects for other extraordinary beings in Christianity—the Holy Spirit and Jesus—but not for an ordinary being (priest). We conclude that it is unintuitive to conceptualize extraordinary beings as disembodied, and that this, rather than inherent Cartesian dualism, may explain the prevalence of beliefs in such beings.     

Variance Distribution in Sibling Relationships: Advantages of Multilevel Modeling Using Full Sibling Groups

The majority of research on sibling relationships has investigated only one or two siblings in a family, but there are many theoretical and methodological limitations to this single dyadic perspective. This study uses multiple siblings (541 adults) in 184 families, where 96 of these families had all siblings complete the study, to demonstrate the value in including full sibling groups when conducting research on sibling relationships. Two scales, positivity and willingness to sacrifice, are evaluated with a multilevel model to account for the nested nature of family relationships. The distribution of variance across three levels: relationship, individual, and family are computed, and results indicate that the relationship level explains the most variance in positivity, whereas the individual level explains the majority of variance in willingness to sacrifice. These distributions are affected by gender composition and family size. The results of this study highlight an important and often overlooked element of family research: The meaning of a scale changes based on its distribution of variance at these three levels. Researchers are encouraged to be cognizant of the variance distribution of their scales when studying sibling relationships and to incorporate more full sibling groups into their research methods and study design.     

Feeling bad and doing good: The effect of customer mistreatment on service employee's daily display of helping behaviors

Mistreatment by customers is a common occurrence for many frontline service employees. Although some evidence suggests that employees engage in dysfunctional workplace behaviors as a result of mistreatment, others studies have suggested that employees may cope with such negative experiences by helping others. Drawing on negative state relief theory, we conducted 2 studies to test these relationships and examine whether service employees cope with negative emotions arising from such daily customer mistreatment by engaging in helping others. In Study 1, daily surveys from 70 restaurant employees showed that daily customer mistreatment predicted the experience of negative moods the next morning, which, in turn, led to higher levels of coworker helping the next day. In Study 2, daily surveys from 54 retail employees showed that daily customer mistreatment led to higher customer helping the next day, but only when customer orientation was high. Our results further show that helping behavior was associated with elevated positive affective experiences and that the proposed relationships differ depending on whether customer mistreatment is measured at a daily or a cumulative perspective. Specifically, cumulative customer mistreatment over time decreased general helping. These findings are discussed in relation to employees' coping strategies towards acute and cumulative mistreatment.     

Functional coupling between the limbs during bimanual reach-to-grasp movements

While it is frequently advantageous to be able to use our hands independently, many actions demand that we use our hands co-operatively. In this paper we present two experiments that examine functional binding between the limbs during the execution of bimanual reach-to-grasp movements. The first experiment examines the effect of gaze direction on unimanual and bimanual reaches. Even when subjects' eye movements are restricted during bimanual reaches so that they may only foveate one target object, the limbs remain tightly synchronized to a common movement duration. In contrast, grip aperture is independently scaled to the size of the target for each hand. The second experiment demonstrates however, that the independent scaling of grip aperture is task dependent. If the two target objects are unified so that they appear to be part of a single object, grip apertures become more similar across the hands (i.e., grip aperture to the large target object is reduced in size while peak aperture to the small target item is increased in size). These results suggest that the coupling of the limbs can operate at a functional level.     

Two reasons to abandon the false belief task as a test of theory of mind

The false belief task has often been used as a test of theory of mind. We present two reasons to abandon this practice. First, passing the false belief task requires abilities other than theory of mind. Second, theory of mind need not entail the ability to reason about false beliefs. We conclude with an alternative conception of the role of the false belief task.     

A Study of Church Members During Times of Crisis

The purpose of the current study was to understand what church members experience during a situational crisis and identify the resources of social support that are helpful for them. By identifying the degree to which personal religious beliefs and participation in a particular congregation help people in crisis, this study sought to provide a foundation from which religious as well as mental health professionals can understand the psychological benefits of religious involvement. For the purposes of this research the investigators developed the Crisis Appraisal and Coping Interview Protocol. The research team collected interview data from 26 members of one Southern Baptist congregation within two weeks of a crisis event. Qualitative analysis identified several key themes that appeared which are discussed.